TABLE OF CONTENTS

| ​ | Delaware                                                      | ​ | ​ | 27-6822130                          | ​ |
|---------|---------------------------------------------------------------|---------|---------|-------------------------------------|---------|
| ​ | (State or other jurisdiction ofincorporation or organization) | ​ | ​ | (I.R.S. EmployerIdentification No.) | ​ |
| ​ | 201 Rouse BoulevardPhiladelphia, Pennsylvania                 | ​ | ​ | 19112                               | ​ |
| ​ | (Address of principal executive office)                       | ​ | ​ | (Zip Code)                          | ​ |
| ​ | Large accelerated filer ☐ | ​ | ​ | Accelerated filer ☐ | ​ | ​ | Non-accelerated filer ☒ | ​ | ​ | Smaller reporting company ☐ | ​ |
|---------|---------------------------------|---------|---------|---------------------------|---------|---------|-------------------------------|---------|---------|-----------------------------------|---------|
| ​ | ​                         | ​ | ​ | ​                   | ​ | ​ | ​                       | ​ | ​ | Emerging growth company ☐   | ​ |

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TABLE OF CONTENTS​​

| ​                                                                                                                    | ​ | ​ | Page    | ​ |
|----------------------------------------------------------------------------------------------------------------------------|---------|---------|---------|---------|
| PART I—FINANCIAL INFORMATION                                                                                         | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| ITEM 1.FINANCIAL STATEMENTS​                                                                                         | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Consolidated Balance Sheets as of September 30, 2018 (Unaudited) and December 31, 2017                           | ​ | ​ | ​ | ​ | 1 | ​ | ​ |
| Unaudited Consolidated Statements of Operations for the three and nine months ended September 30, 2018 and 2017  | ​ | ​ | ​ | ​ | 2 | ​ | ​ |
| Unaudited Consolidated Statements of Changes in Net Assets for the nine months ended September 30, 2018 and 2017 | ​ | ​ | ​ | ​ | 3 | ​ | ​ |
| Unaudited Consolidated Statements of Cash Flows for the nine months ended September 30, 2018 and 2017            | ​ | ​ | ​ | ​ | 4 | ​ | ​ |
| Consolidated Schedules of Investments as of September 30, 2018 (Unaudited) and December 31, 2017                 | ​ | ​ | ​ | ​ | 5 | ​ | ​ |
| Notes to Unaudited Consolidated Financial Statements                                                                       | ​ | ​ | ​ | ​ | 19 | ​ | ​ |
| ITEM 2.MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS ​                 | ​ | ​ | ​ | ​ | 45 | ​ | ​ |
| ITEM 3.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK ​                                                  | ​ | ​ | ​ | ​ | 60 | ​ | ​ |
| ITEM 4.CONTROLS AND PROCEDURES ​                                                                                     | ​ | ​ | ​ | ​ | 61 | ​ | ​ |
| PART II—OTHER INFORMATION                                                                                            | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| ITEM 1.LEGAL PROCEEDINGS ​                                                                                           | ​ | ​ | ​ | ​ | 62 | ​ | ​ |
| ITEM 1A.RISK FACTORS ​                                                                                               | ​ | ​ | ​ | ​ | 62 | ​ | ​ |
| ITEM 2.UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS ​                                                 | ​ | ​ | ​ | ​ | 62 | ​ | ​ |
| ITEM 3.DEFAULTS UPON SENIOR SECURITIES ​                                                                             | ​ | ​ | ​ | ​ | 62 | ​ | ​ |
| ITEM 4.MINE SAFETY DISCLOSURES ​                                                                                     | ​ | ​ | ​ | ​ | 62 | ​ | ​ |
| ITEM 5.OTHER INFORMATION ​                                                                                           | ​ | ​ | ​ | ​ | 62 | ​ | ​ |
| ITEM 6.EXHIBITS ​                                                                                                    | ​ | ​ | ​ | ​ | 63 | ​ | ​ |
| SIGNATURES                                                                                                                 | ​ | ​ | ​ | ​ | 69 | ​ | ​ |

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TABLE OF CONTENTS​

| ​                                                                                                                                 | ​ | ​ | September 30, 2018 (Unaudited) | ​ | ​   | December 31, 2017 | ​ |
|-----------------------------------------------------------------------------------------------------------------------------------------|---------|---------|-------------------------------------|---------|-----------|------------------------|---------|
| Assets                                                                                                                                  | ​ | ​ | ​                             | ​ | ​   | ​                | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Investments, at fair value                                                                                                              | ​ | ​ | ​                             | ​ | ​   | ​                | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Non-controlled/unaffiliated investments (amortized cost—$3,101,641 and $3,490,683, respectively)                                  | ​ | ​ | ​                             | $       | 3,035,721 | ​                | ​ | ​ | ​ | $ | 3,281,536 | ​ | ​ |
| Non-controlled/affiliated investments (amortized cost—$880,350 and $839,619, respectively)                                        | ​ | ​ | ​                             | ​ | 692,168   | ​                | ​ | ​ | ​ | ​ | 715,169 | ​ | ​ |
| Controlled/affiliated investments (amortized cost—$27,464 and $27,464, respectively)                                              | ​ | ​ | ​                             | ​ | —   | ​                | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Total investments, at fair value (amortized cost—$4,009,455 and $4,357,766, respectively)                                         | ​ | ​ | ​                             | ​ | 3,727,889 | ​                | ​ | ​ | ​ | ​ | 3,996,705 | ​ | ​ |
| Cash                                                                                                                                    | ​ | ​ | ​                             | ​ | 350,753   | ​                | ​ | ​ | ​ | ​ | 195,376 | ​ | ​ |
| Receivable for investments sold and repaid                                                                                              | ​ | ​ | ​                             | ​ | 13,646    | ​                | ​ | ​ | ​ | ​ | 66,337 | ​ | ​ |
| Interest receivable                                                                                                                     | ​ | ​ | ​                             | ​ | 48,130    | ​                | ​ | ​ | ​ | ​ | 51,293 | ​ | ​ |
| Deferred financing costs                                                                                                                | ​ | ​ | ​                             | ​ | —   | ​                | ​ | ​ | ​ | ​ | 720 | ​ | ​ |
| Reimbursement due from sponsor(1)                                                                                                       | ​ | ​ | ​                             | ​ | —   | ​                | ​ | ​ | ​ | ​ | 5,945 | ​ | ​ |
| Prepaid expenses and other assets                                                                                                       | ​ | ​ | ​                             | ​ | 52        | ​                | ​ | ​ | ​ | ​ | 55 | ​ | ​ |
| Total assets                                                                                                                            | ​ | ​ | ​                             | $       | 4,140,470 | ​                | ​ | ​ | ​ | $ | 4,316,431 | ​ | ​ |
| Liabilities                                                                                                                             | ​ | ​ | ​                             | ​ | ​   | ​                | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Payable for investments purchased                                                                                                       | ​ | ​ | ​                             | $       | 98,398    | ​                | ​ | ​ | ​ | $ | 88,033 | ​ | ​ |
| Credit facilities payable (net of deferred financing costs of  $9,034 and $1,883, respectively)(2)                                | ​ | ​ | ​                             | ​ | 622,633   | ​                | ​ | ​ | ​ | ​ | 1,218,117 | ​ | ​ |
| Secured note payable (net of deferred financing costs of  $8,605 and $0, respectively)(2)                                         | ​ | ​ | ​                             | ​ | 481,515   | ​                | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Shareholder distributions payable                                                                                                       | ​ | ​ | ​                             | ​ | 8,724     | ​                | ​ | ​ | ​ | ​ | 10,938 | ​ | ​ |
| Management fees payable                                                                                                                 | ​ | ​ | ​                             | ​ | 16,977    | ​                | ​ | ​ | ​ | ​ | 21,834 | ​ | ​ |
| Administrative services expense payable                                                                                                 | ​ | ​ | ​                             | ​ | 845       | ​                | ​ | ​ | ​ | ​ | 361 | ​ | ​ |
| Interest payable                                                                                                                        | ​ | ​ | ​                             | ​ | 6,070     | ​                | ​ | ​ | ​ | ​ | 6,033 | ​ | ​ |
| Trustees’ fees payable                                                                                                            | ​ | ​ | ​                             | ​ | 187       | ​                | ​ | ​ | ​ | ​ | 252 | ​ | ​ |
| Other accrued expenses and liabilities                                                                                                  | ​ | ​ | ​                             | ​ | 4,285     | ​                | ​ | ​ | ​ | ​ | 4,821 | ​ | ​ |
| Total liabilities                                                                                                                       | ​ | ​ | ​                             | ​ | 1,239,634 | ​                | ​ | ​ | ​ | ​ | 1,350,389 | ​ | ​ |
| Commitments and contingencies ($28,104 and $28,104, respectively)(3)                                                                    | ​ | ​ | ​                             | ​ | ​   | ​                | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Shareholders’ equity                                                                                                              | ​ | ​ | ​                             | ​ | ​   | ​                | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Preferred shares, $0.001 par value, 50,000,000 shares authorized, none issued and outstanding                                           | ​ | ​ | ​                             | ​ | —   | ​                | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Common shares, $0.001 par value, 700,000,000 shares authorized, 440,686,304 and 446,045,135 shares issued and outstanding, respectively | ​ | ​ | ​                             | ​ | 441       | ​                | ​ | ​ | ​ | ​ | 446 | ​ | ​ |
| Capital in excess of par value                                                                                                          | ​ | ​ | ​                             | ​ | 3,778,451 | ​                | ​ | ​ | ​ | ​ | 3,814,303 | ​ | ​ |
| Accumulated loss                                                                                                                        | ​ | ​ | ​                             | ​ | (878,056) | ​                | ​ | ​ | ​ | ​ | (848,707) | ​ | ​ |
| Total shareholders’ equity                                                                                                        | ​ | ​ | ​                             | ​ | 2,900,836 | ​                | ​ | ​ | ​ | ​ | 2,966,042 | ​ | ​ |
| Total liabilities and shareholders’ equity                                                                                        | ​ | ​ | ​                             | $       | 4,140,470 | ​                | ​ | ​ | ​ | $ | 4,316,431 | ​ | ​ |
| Net asset value per common share at period end                                                                                          | ​ | ​ | ​                             | $       | 6.58      | ​                | ​ | ​ | ​ | $ | 6.65 | ​ | ​ |

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TABLE OF CONTENTS​

| ​                                                                              | ​ | ​ | Three Months Ended September 30, | ​ | ​     | Nine Months Ended September 30, | ​ |
|--------------------------------------------------------------------------------------|---------|---------|---------------------------------------|---------|-------------|--------------------------------------|---------|
| ​                                                                              | ​ | ​ | 2018                                  | ​ | ​     | 2017                                 | ​ | ​ | 2018 | ​ | ​ | 2017 | ​ |
| Investment income                                                                    | ​ | ​ | ​                               | ​ | ​     | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| From non-controlled/unaffiliated investments:                                        | ​ | ​ | ​                               | ​ | ​     | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Interest income                                                                      | ​ | ​ | ​                               | $       | 64,440      | ​                              | ​ | ​ | ​ | $ | 56,016 | ​ | ​ | ​ | ​ | $ | 193,777 | ​ | ​ | ​ | ​ | $ | 201,939 | ​ | ​ |
| Paid-in-kind interest income                                                         | ​ | ​ | ​                               | ​ | 2,052       | ​                              | ​ | ​ | ​ | ​ | 5,704 | ​ | ​ | ​ | ​ | ​ | 5,786 | ​ | ​ | ​ | ​ | ​ | 16,461 | ​ | ​ |
| Fee income                                                                           | ​ | ​ | ​                               | ​ | 1,974       | ​                              | ​ | ​ | ​ | ​ | 7,056 | ​ | ​ | ​ | ​ | ​ | 9,849 | ​ | ​ | ​ | ​ | ​ | 37,419 | ​ | ​ |
| Dividend income                                                                      | ​ | ​ | ​                               | ​ | 150         | ​                              | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 150 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| From non-controlled/affiliated investments:                                          | ​ | ​ | ​                               | ​ | ​     | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Interest income                                                                      | ​ | ​ | ​                               | ​ | 11,267      | ​                              | ​ | ​ | ​ | ​ | 28,660 | ​ | ​ | ​ | ​ | ​ | 35,064 | ​ | ​ | ​ | ​ | ​ | 53,525 | ​ | ​ |
| Paid-in-kind interest income                                                         | ​ | ​ | ​                               | ​ | 458         | ​                              | ​ | ​ | ​ | ​ | 3,635 | ​ | ​ | ​ | ​ | ​ | 1,669 | ​ | ​ | ​ | ​ | ​ | 9,957 | ​ | ​ |
| Fee income                                                                           | ​ | ​ | ​                               | ​ | —     | ​                              | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 2,091 | ​ | ​ | ​ | ​ | ​ | 656 | ​ | ​ |
| Total investment income                                                              | ​ | ​ | ​                               | ​ | 80,341      | ​                              | ​ | ​ | ​ | ​ | 101,071 | ​ | ​ | ​ | ​ | ​ | 248,386 | ​ | ​ | ​ | ​ | ​ | 319,957 | ​ | ​ |
| Operating expenses                                                                   | ​ | ​ | ​                               | ​ | ​     | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Management fees                                                                      | ​ | ​ | ​                               | ​ | 16,977      | ​                              | ​ | ​ | ​ | ​ | 22,031 | ​ | ​ | ​ | ​ | ​ | 52,393 | ​ | ​ | ​ | ​ | ​ | 67,104 | ​ | ​ |
| Subordinated income incentive fees(1)                                                | ​ | ​ | ​                               | ​ | —     | ​                              | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 10,499 | ​ | ​ |
| Administrative services expenses                                                     | ​ | ​ | ​                               | ​ | 1,211       | ​                              | ​ | ​ | ​ | ​ | 611 | ​ | ​ | ​ | ​ | ​ | 2,806 | ​ | ​ | ​ | ​ | ​ | 2,218 | ​ | ​ |
| Share transfer agent fees                                                            | ​ | ​ | ​                               | ​ | 658         | ​                              | ​ | ​ | ​ | ​ | 658 | ​ | ​ | ​ | ​ | ​ | 1,951 | ​ | ​ | ​ | ​ | ​ | 2,066 | ​ | ​ |
| Accounting and administrative fees                                                   | ​ | ​ | ​                               | ​ | 312         | ​                              | ​ | ​ | ​ | ​ | 384 | ​ | ​ | ​ | ​ | ​ | 1,012 | ​ | ​ | ​ | ​ | ​ | 1,216 | ​ | ​ |
| Interest expense(2)                                                                  | ​ | ​ | ​                               | ​ | 17,714      | ​                              | ​ | ​ | ​ | ​ | 13,648 | ​ | ​ | ​ | ​ | ​ | 45,983 | ​ | ​ | ​ | ​ | ​ | 35,454 | ​ | ​ |
| Trustees’ fees                                                                 | ​ | ​ | ​                               | ​ | 187         | ​                              | ​ | ​ | ​ | ​ | 244 | ​ | ​ | ​ | ​ | ​ | 821 | ​ | ​ | ​ | ​ | ​ | 744 | ​ | ​ |
| Other general and administrative expenses                                            | ​ | ​ | ​                               | ​ | 1,956       | ​                              | ​ | ​ | ​ | ​ | 563 | ​ | ​ | ​ | ​ | ​ | 3,789 | ​ | ​ | ​ | ​ | ​ | 2,672 | ​ | ​ |
| Total operating expenses                                                             | ​ | ​ | ​                               | ​ | 39,015      | ​                              | ​ | ​ | ​ | ​ | 38,139 | ​ | ​ | ​ | ​ | ​ | 108,755 | ​ | ​ | ​ | ​ | ​ | 121,973 | ​ | ​ |
| Less: Expense reimbursement from sponsor(3)                                          | ​ | ​ | ​                               | ​ | —     | ​                              | ​ | ​ | ​ | ​ | (7,095) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (25,315) | ​ | ​ |
| Less: Expense reimbursement due to sponsor(3)                                        | ​ | ​ | ​                               | ​ | —     | ​                              | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 2,858 | ​ | ​ |
| Net expenses                                                                         | ​ | ​ | ​                               | ​ | 39,015      | ​                              | ​ | ​ | ​ | ​ | 31,044 | ​ | ​ | ​ | ​ | ​ | 108,755 | ​ | ​ | ​ | ​ | ​ | 99,516 | ​ | ​ |
| Net investment income                                                                | ​ | ​ | ​                               | ​ | 41,326      | ​                              | ​ | ​ | ​ | ​ | 70,027 | ​ | ​ | ​ | ​ | ​ | 139,631 | ​ | ​ | ​ | ​ | ​ | 220,441 | ​ | ​ |
| Realized and unrealized gain/loss                                                    | ​ | ​ | ​                               | ​ | ​     | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Net realized gain (loss) on investments:                                             | ​ | ​ | ​                               | ​ | ​     | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Non-controlled/unaffiliated                                                          | ​ | ​ | ​                               | ​ | (5,750)     | ​                              | ​ | ​ | ​ | ​ | 7,271 | ​ | ​ | ​ | ​ | ​ | (84,194) | ​ | ​ | ​ | ​ | ​ | (70,244) | ​ | ​ |
| Non-controlled/affiliated                                                            | ​ | ​ | ​                               | ​ | 56          | ​                              | ​ | ​ | ​ | ​ | (1,060) | ​ | ​ | ​ | ​ | ​ | 56 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Net realized gain (loss) on foreign currency                                         | ​ | ​ | ​                               | ​ | —     | ​                              | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 1 | ​ | ​ |
| Net change in unrealized appreciation (depreciation) on investments:                 | ​ | ​ | ​                               | ​ | ​     | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Non-controlled/unaffiliated                                                          | ​ | ​ | ​                               | ​ | 64,493      | ​                              | ​ | ​ | ​ | ​ | 13,176 | ​ | ​ | ​ | ​ | ​ | 143,227 | ​ | ​ | ​ | ​ | ​ | (47,179) | ​ | ​ |
| Non-controlled/affiliated                                                            | ​ | ​ | ​                               | ​ | (12,831)    | ​                              | ​ | ​ | ​ | ​ | (20,439) | ​ | ​ | ​ | ​ | ​ | (63,732) | ​ | ​ | ​ | ​ | ​ | (119,904) | ​ | ​ |
| Controlled/affiliated                                                                | ​ | ​ | ​                               | ​ | —     | ​                              | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (1,531) | ​ | ​ |
| Net change in unrealized gain (loss) on foreign currency                             | ​ | ​ | ​                               | ​ | 1           | ​                              | ​ | ​ | ​ | ​ | (1) | ​ | ​ | ​ | ​ | ​ | 21 | ​ | ​ | ​ | ​ | ​ | 51 | ​ | ​ |
| Total net realized and unrealized gain (loss)                                        | ​ | ​ | ​                               | ​ | 45,969      | ​                              | ​ | ​ | ​ | ​ | (1,053) | ​ | ​ | ​ | ​ | ​ | (4,622) | ​ | ​ | ​ | ​ | ​ | (238,806) | ​ | ​ |
| Net increase (decrease) in net assets resulting from operations                      | ​ | ​ | ​                               | $       | 87,295      | ​                              | ​ | ​ | ​ | $ | 68,974 | ​ | ​ | ​ | ​ | $ | 135,009 | ​ | ​ | ​ | ​ | $ | (18,365) | ​ | ​ |
| Per share information—basic and diluted                                        | ​ | ​ | ​                               | ​ | ​     | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Net increase (decrease) in net assets resulting from operations (Earnings per Share) | ​ | ​ | ​                               | $       | 0.20        | ​                              | ​ | ​ | ​ | $ | 0.16 | ​ | ​ | ​ | ​ | $ | 0.31 | ​ | ​ | ​ | ​ | $ | (0.04) | ​ | ​ |
| Weighted average shares outstanding                                                  | ​ | ​ | ​                               | ​ | 438,931,809 | ​                              | ​ | ​ | ​ | ​ | 443,940,981 | ​ | ​ | ​ | ​ | ​ | 439,377,180 | ​ | ​ | ​ | ​ | ​ | 442,503,872 | ​ | ​ |

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TABLE OF CONTENTS​

| ​                                                                         | ​ | ​ | Nine Months Ended September 30, | ​ |
|---------------------------------------------------------------------------------|---------|---------|--------------------------------------|---------|
| ​                                                                         | ​ | ​ | 2018                                 | ​ | ​ | 2017 | ​ |
| Operations                                                                      | ​ | ​ | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Net investment income                                                           | ​ | ​ | ​                              | $       | 139,631 | ​ | ​ | ​ | ​ | $ | 220,441 | ​ | ​ |
| Net realized gain (loss) on investments and foreign currency                    | ​ | ​ | ​                              | ​ | (84,138) | ​ | ​ | ​ | ​ | ​ | (70,243) | ​ | ​ |
| Net change in unrealized appreciation (depreciation) on investments             | ​ | ​ | ​                              | ​ | 79,495 | ​ | ​ | ​ | ​ | ​ | (168,614) | ​ | ​ |
| Net change in unrealized gain (loss) on foreign currency                        | ​ | ​ | ​                              | ​ | 21 | ​ | ​ | ​ | ​ | ​ | 51 | ​ | ​ |
| Net increase (decrease) in net assets resulting from operations                 | ​ | ​ | ​                              | ​ | 135,009 | ​ | ​ | ​ | ​ | ​ | (18,365) | ​ | ​ |
| Shareholder distributions(1)                                                    | ​ | ​ | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Distributions to shareholders                                                   | ​ | ​ | ​                              | ​ | (164,358) | ​ | ​ | ​ | ​ | ​ | (234,473) | ​ | ​ |
| Net decrease in net assets resulting from shareholder distributions             | ​ | ​ | ​                              | ​ | (164,358) | ​ | ​ | ​ | ​ | ​ | (234,473) | ​ | ​ |
| Capital share transactions(2)                                                   | ​ | ​ | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Reinvestment of shareholder distributions                                       | ​ | ​ | ​                              | ​ | 90,329 | ​ | ​ | ​ | ​ | ​ | 140,580 | ​ | ​ |
| Repurchases of common shares                                                    | ​ | ​ | ​                              | ​ | (126,186) | ​ | ​ | ​ | ​ | ​ | (88,730) | ​ | ​ |
| Net increase (decrease) in net assets resulting from capital share transactions | ​ | ​ | ​                              | ​ | (35,857) | ​ | ​ | ​ | ​ | ​ | 51,850 | ​ | ​ |
| Total increase (decrease) in net assets                                         | ​ | ​ | ​                              | ​ | (65,206) | ​ | ​ | ​ | ​ | ​ | (200,988) | ​ | ​ |
| Net assets at beginning of period                                               | ​ | ​ | ​                              | ​ | 2,966,042 | ​ | ​ | ​ | ​ | ​ | 3,348,894 | ​ | ​ |
| Net assets at end of period                                                     | ​ | ​ | ​                              | $       | 2,900,836 | ​ | ​ | ​ | ​ | $ | 3,147,906 | ​ | ​ |
| ​                                                                         |

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TABLE OF CONTENTS​

| ​                                                                                                                                          | ​ | ​ | Nine Months Ended September 30, | ​ |
|--------------------------------------------------------------------------------------------------------------------------------------------------|---------|---------|--------------------------------------|---------|
| ​                                                                                                                                          | ​ | ​ | 2018                                 | ​ | ​ | 2017 | ​ |
| Cash flows from operating activities                                                                                                             | ​ | ​ | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Net increase (decrease) in net assets resulting from operations                                                                                  | ​ | ​ | ​                              | $       | 135,009 | ​ | ​ | ​ | ​ | $ | (18,365) | ​ | ​ |
| Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities: | ​ | ​ | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Purchases of investments                                                                                                                         | ​ | ​ | ​                              | ​ | (1,155,976) | ​ | ​ | ​ | ​ | ​ | (1,591,008) | ​ | ​ |
| Paid-in-kind interest                                                                                                                            | ​ | ​ | ​                              | ​ | (7,455) | ​ | ​ | ​ | ​ | ​ | (26,418) | ​ | ​ |
| Proceeds from sales and repayments of investments                                                                                                | ​ | ​ | ​                              | ​ | 1,437,531 | ​ | ​ | ​ | ​ | ​ | 1,064,392 | ​ | ​ |
| Net realized (gain) loss on investments                                                                                                          | ​ | ​ | ​                              | ​ | 84,138 | ​ | ​ | ​ | ​ | ​ | 70,244 | ​ | ​ |
| Net change in unrealized (appreciation) depreciation on investments                                                                              | ​ | ​ | ​                              | ​ | (79,495) | ​ | ​ | ​ | ​ | ​ | 168,614 | ​ | ​ |
| Accretion of discount                                                                                                                            | ​ | ​ | ​                              | ​ | (9,927) | ​ | ​ | ​ | ​ | ​ | (17,668) | ​ | ​ |
| Amortization of deferred financing costs and discount                                                                                            | ​ | ​ | ​                              | ​ | 2,759 | ​ | ​ | ​ | ​ | ​ | 3,160 | ​ | ​ |
| (Increase) decrease in receivable for investments sold and repaid                                                                                | ​ | ​ | ​                              | ​ | 52,691 | ​ | ​ | ​ | ​ | ​ | (18,266) | ​ | ​ |
| (Increase) decrease in interest receivable                                                                                                       | ​ | ​ | ​                              | ​ | 3,163 | ​ | ​ | ​ | ​ | ​ | (25,873) | ​ | ​ |
| (Increase) decrease in expense reimbursement due from sponsor(1)                                                                                 | ​ | ​ | ​                              | ​ | 5,945 | ​ | ​ | ​ | ​ | ​ | (7,095) | ​ | ​ |
| (Increase) decrease in prepaid expenses and other assets                                                                                         | ​ | ​ | ​                              | ​ | 3 | ​ | ​ | ​ | ​ | ​ | (102) | ​ | ​ |
| Increase (decrease) in payable for investments purchased                                                                                         | ​ | ​ | ​                              | ​ | 10,365 | ​ | ​ | ​ | ​ | ​ | 15,194 | ​ | ​ |
| Increase (decrease) in management fees payable                                                                                                   | ​ | ​ | ​                              | ​ | (4,857) | ​ | ​ | ​ | ​ | ​ | 1,176 | ​ | ​ |
| Increase (decrease) in administrative services expense payable                                                                                   | ​ | ​ | ​                              | ​ | 484 | ​ | ​ | ​ | ​ | ​ | (423) | ​ | ​ |
| Increase (decrease) in interest payable(2)                                                                                                       | ​ | ​ | ​                              | ​ | 37 | ​ | ​ | ​ | ​ | ​ | 395 | ​ | ​ |
| Increase (decrease) in trustees’ fees payable                                                                                              | ​ | ​ | ​                              | ​ | (65) | ​ | ​ | ​ | ​ | ​ | (6) | ​ | ​ |
| Increase (decrease) in other accrued expenses and liabilities                                                                                    | ​ | ​ | ​                              | ​ | (536) | ​ | ​ | ​ | ​ | ​ | (418) | ​ | ​ |
| Net cash provided by (used in) operating activities                                                                                              | ​ | ​ | ​                              | ​ | 473,814 | ​ | ​ | ​ | ​ | ​ | (382,467) | ​ | ​ |
| Cash flows from financing activities                                                                                                             | ​ | ​ | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Reinvestment of shareholder distributions                                                                                                        | ​ | ​ | ​                              | ​ | 90,329 | ​ | ​ | ​ | ​ | ​ | 140,580 | ​ | ​ |
| Repurchases of common shares                                                                                                                     | ​ | ​ | ​                              | ​ | (126,186) | ​ | ​ | ​ | ​ | ​ | (88,730) | ​ | ​ |
| Shareholder distributions                                                                                                                        | ​ | ​ | ​                              | ​ | (166,572) | ​ | ​ | ​ | ​ | ​ | (233,072) | ​ | ​ |
| Borrowings under credit facilities(2)                                                                                                            | ​ | ​ | ​                              | ​ | 321,667 | ​ | ​ | ​ | ​ | ​ | 858,263 | ​ | ​ |
| Borrowings under secured notes(2)                                                                                                                | ​ | ​ | ​                              | ​ | 489,865 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Repayments of credit facilities(2)                                                                                                               | ​ | ​ | ​                              | ​ | (910,000) | ​ | ​ | ​ | ​ | ​ | (186,928) | ​ | ​ |
| Repayments under repurchase facility(2)                                                                                                          | ​ | ​ | ​                              | ​ | — | ​ | ​ | ​ | ​ | ​ | (325,000) | ​ | ​ |
| Deferred financing costs paid                                                                                                                    | ​ | ​ | ​                              | ​ | (17,540) | ​ | ​ | ​ | ​ | ​ | (2,601) | ​ | ​ |
| Net cash provided by (used in) financing activities                                                                                              | ​ | ​ | ​                              | ​ | (318,437) | ​ | ​ | ​ | ​ | ​ | 162,512 | ​ | ​ |
| Total increase (decrease) in cash                                                                                                                | ​ | ​ | ​                              | ​ | 155,377 | ​ | ​ | ​ | ​ | ​ | (219,955) | ​ | ​ |
| Cash at beginning of period                                                                                                                      | ​ | ​ | ​                              | ​ | 195,376 | ​ | ​ | ​ | ​ | ​ | 317,520 | ​ | ​ |
| Cash at end of period                                                                                                                            | ​ | ​ | ​                              | $       | 350,753 | ​ | ​ | ​ | ​ | $ | 97,565 | ​ | ​ |
| Supplemental disclosure                                                                                                                          | ​ | ​ | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Non-cash purchases of investments                                                                                                                | ​ | ​ | ​                              | $       | (135,113) | ​ | ​ | ​ | ​ | $ | (16,957) | ​ | ​ |
| Non-cash sales of investments                                                                                                                    | ​ | ​ | ​                              | $       | 135,113 | ​ | ​ | ​ | ​ | $ | 16,957 | ​ | ​ |
| ​                                                                                                                                          |

----

TABLE OF CONTENTS​

| Portfolio Company(a)                                       | ​ | ​ | Footnotes       | ​ | ​ | Industry                | ​ | ​ | Rate(b)                         | ​ | ​ | Floor   | ​ | ​ | Maturity | ​ | ​ | Principal Amount(c) | ​ | ​ | Amortized Cost | ​ | ​ | Fair Value(d) |
|------------------------------------------------------------|---------|---------|-----------------|---------|---------|-------------------------|---------|---------|---------------------------------|---------|---------|---------|---------|---------|----------|---------|---------|---------------------|---------|---------|----------------|---------|---------|---------------|
| Senior Secured Loans—First Lien—33.4%          | ​ | ​ | ​         | ​ | ​ | ​                 | ​ | ​ | ​                         | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​             | ​ | ​ | ​        | ​ | ​ | ​       | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Abaco Energy Technologies LLC                              | ​ | ​ | (h)             | ​ | ​ | Service & Equipment | ​ | ​ | L+950                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 11/20/20            | ​ | ​ | ​        | $       | 61,128  | ​       | ​ | ​ | ​ | $ | 59,012 | ​ | ​ | ​ | ​ | $ | 61,281 |
| Allied Wireline Services, LLC                              | ​ | ​ | (w)(x)          | ​ | ​ | Service & Equipment | ​ | ​ | L+950                           | ​ | ​ | ​ | ​ | 1.5%    | ​  | ​ | ​ | 6/30/20             | ​ | ​ | ​        | ​ | 115,104 | ​       | ​ | ​ | ​ | ​ | 114,902 | ​ | ​ | ​ | ​ | ​ | 115,104 |
| Altus Power America, Inc.                                  | ​ | ​ | (h)(w)(y)       | ​ | ​ | Power                   | ​ | ​ | L+750                           | ​ | ​ | ​ | ​ | 1.5%    | ​  | ​ | ​ | 9/30/21             | ​ | ​ | ​        | ​ | 83,963  | ​       | ​ | ​ | ​ | ​ | 83,963 | ​ | ​ | ​ | ​ | ​ | 81,445 |
| Altus Power America, Inc.                                  | ​ | ​ | (e)(w)(y)       | ​ | ​ | Power                   | ​ | ​ | L+750                           | ​ | ​ | ​ | ​ | 1.5%    | ​  | ​ | ​ | 9/30/21             | ​ | ​ | ​        | ​ | 5,762   | ​       | ​ | ​ | ​ | ​ | 5,762 | ​ | ​ | ​ | ​ | ​ | 5,589 |
| ARB Midstream Operating Company, LLC                       | ​ | ​ | (w)(x)          | ​ | ​ | Midstream               | ​ | ​ | L+725                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 11/6/21             | ​ | ​ | ​        | ​ | 3,182   | ​       | ​ | ​ | ​ | ​ | 3,170 | ​ | ​ | ​ | ​ | ​ | 3,194 |
| Bioenergy Infrastructure Holdings Limited                  | ​ | ​ | (k)(w)          | ​ | ​ | Power                   | ​ | ​ | L+725                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 12/22/22            | ​ | ​ | ​        | ​ | 957     | ​       | ​ | ​ | ​ | ​ | 950 | ​ | ​ | ​ | ​ | ​ | 976 |
| Bioenergy Infrastructure Holdings Limited                  | ​ | ​ | (e)(k)(w)       | ​ | ​ | Power                   | ​ | ​ | L+725                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 12/22/22            | ​ | ​ | ​        | ​ | 543     | ​       | ​ | ​ | ​ | ​ | 543 | ​ | ​ | ​ | ​ | ​ | 554 |
| Bioenergy Infrastructure Holdings Limited                  | ​ | ​ | (e)(k)(w)       | ​ | ​ | Power                   | ​ | ​ | L+725                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 12/22/22            | ​ | ​ | ​        | ​ | 544     | ​       | ​ | ​ | ​ | ​ | 544 | ​ | ​ | ​ | ​ | ​ | 554 |
| BL Sand Hills Unit, L.P.                                   | ​ | ​ | (w)(x)(y)       | ​ | ​ | Upstream                | ​ | ​ | Prime+650                       | ​ | ​ | ​ | ​ | 3.5%    | ​  | ​ | ​ | 12/17/21            | ​ | ​ | ​        | ​ | 20,000  | ​       | ​ | ​ | ​ | ​ | 17,401 | ​ | ​ | ​ | ​ | ​ | 20,000 |
| Cimarron Energy Inc.                                       | ​ | ​ | (m)(o)(w)(x)    | ​ | ​ | Service & Equipment | ​ | ​ | L+1150 PIK (L+1150 Max PIK)     | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 12/15/19            | ​ | ​ | ​        | ​ | 25,491  | ​       | ​ | ​ | ​ | ​ | 24,841 | ​ | ​ | ​ | ​ | ​ | 13,606 |
| Compass Power Generation LLC                               | ​ | ​ | (x)             | ​ | ​ | Power                   | ​ | ​ | L+350                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 12/20/24            | ​ | ​ | ​        | ​ | 2,969   | ​       | ​ | ​ | ​ | ​ | 2,969 | ​ | ​ | ​ | ​ | ​ | 2,988 |
| Eagle Midstream Canada Finance Inc.                        | ​ | ​ | (k)(w)(x)       | ​ | ​ | Midstream               | ​ | ​ | 8.5%, 1% PIK                    | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 9/27/20             | ​ | ​ | ​        | ​ | 175,000 | ​       | ​ | ​ | ​ | ​ | 175,000 | ​ | ​ | ​ | ​ | ​ | 173,031 |
| Felix Investments Holdings II, LLC                         | ​ | ​ | (w)             | ​ | ​ | Upstream                | ​ | ​ | L+650                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 8/9/22              | ​ | ​ | ​        | ​ | 3,933   | ​       | ​ | ​ | ​ | ​ | 3,924 | ​ | ​ | ​ | ​ | ​ | 3,981 |
| Fortis Minerals Intermediate Holdings, LLC                 | ​ | ​ | (w)             | ​ | ​ | Upstream                | ​ | ​ | L+625                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 2/16/25             | ​ | ​ | ​        | ​ | 18,760  | ​       | ​ | ​ | ​ | ​ | 18,652 | ​ | ​ | ​ | ​ | ​ | 19,148 |
| Fortis Minerals Intermediate Holdings, LLC                 | ​ | ​ | (e)(w)          | ​ | ​ | Upstream                | ​ | ​ | L+625                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 2/16/25             | ​ | ​ | ​        | ​ | 28,140  | ​       | ​ | ​ | ​ | ​ | 28,140 | ​ | ​ | ​ | ​ | ​ | 28,722 |
| Industrial Group Intermediate Holdings, LLC                | ​ | ​ | (h)(w)(x)       | ​ | ​ | Industrials             | ​ | ​ | L+800                           | ​ | ​ | ​ | ​ | 1.3%    | ​  | ​ | ​ | 5/31/20             | ​ | ​ | ​        | ​ | 20,972  | ​       | ​ | ​ | ​ | ​ | 20,972 | ​ | ​ | ​ | ​ | ​ | 20,998 |
| JSS Holdings, Inc.                                         | ​ | ​ | (h)(w)          | ​ | ​ | Industrials             | ​ | ​ | L+800, 0.0% PIK (2.5% Max PIK)  | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 3/31/23             | ​ | ​ | ​        | ​ | 14,926  | ​       | ​ | ​ | ​ | ​ | 14,810 | ​ | ​ | ​ | ​ | ​ | 15,657 |
| Lusk Operating LLC                                         | ​ | ​ | (m)(o)(w)(x)(z) | ​ | ​ | Upstream                | ​ | ​ | Prime+500 PIK (8.8% Max PIK)    | ​ | ​ | ​ | ​ | 3.3%    | ​  | ​ | ​ | 10/31/18            | ​ | ​ | ​        | ​ | 29,297  | ​       | ​ | ​ | ​ | ​ | 27,464 | ​ | ​ | ​ | ​ | ​ | — |
| MB Precision Holdings LLC                                  | ​ | ​ | (m)(o)(w)(x)    | ​ | ​ | Industrials             | ​ | ​ | L+725, 2.3% PIK (2.3% Max PIK)  | ​ | ​ | ​ | ​ | 1.3%    | ​  | ​ | ​ | 1/23/21             | ​ | ​ | ​        | ​ | 13,378  | ​       | ​ | ​ | ​ | ​ | 13,302 | ​ | ​ | ​ | ​ | ​ | 5,853 |
| MECO IV LLC                                                | ​ | ​ | (h)(w)          | ​ | ​ | Upstream                | ​ | ​ | L+725                           | ​ | ​ | ​ | ​ | 1.5%    | ​  | ​ | ​ | 9/14/21             | ​ | ​ | ​        | ​ | 12,250  | ​       | ​ | ​ | ​ | ​ | 12,008 | ​ | ​ | ​ | ​ | ​ | 12,250 |
| MECO IV LLC                                                | ​ | ​ | (e)(w)          | ​ | ​ | Upstream                | ​ | ​ | L+725                           | ​ | ​ | ​ | ​ | 1.5%    | ​  | ​ | ​ | 9/14/21             | ​ | ​ | ​        | ​ | 22,750  | ​       | ​ | ​ | ​ | ​ | 22,750 | ​ | ​ | ​ | ​ | ​ | 22,750 |
| Navitas Midstream Midland Basin LLC                        | ​ | ​ | (f)             | ​ | ​ | Midstream               | ​ | ​ | L+450                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 12/13/24            | ​ | ​ | ​        | ​ | 16,341  | ​       | ​ | ​ | ​ | ​ | 16,350 | ​ | ​ | ​ | ​ | ​ | 16,326 |
| New Age (African Global Energy) Limited                    | ​ | ​ | (k)(w)(x)       | ​ | ​ | Upstream                | ​ | ​ | 15.0%                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 6/28/20             | ​ | ​ | ​        | ​ | 1,658   | ​       | ​ | ​ | ​ | ​ | 1,645 | ​ | ​ | ​ | ​ | ​ | 1,717 |
| NNE Holding LLC                                            | ​ | ​ | (h)(w)          | ​ | ​ | Upstream                | ​ | ​ | L+800                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 3/2/22              | ​ | ​ | ​        | ​ | 30,917  | ​       | ​ | ​ | ​ | ​ | 30,893 | ​ | ​ | ​ | ​ | ​ | 30,960 |
| NNE Holding LLC                                            | ​ | ​ | (e)(w)          | ​ | ​ | Upstream                | ​ | ​ | L+800                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 3/2/22              | ​ | ​ | ​        | ​ | 4,083   | ​       | ​ | ​ | ​ | ​ | 4,083 | ​ | ​ | ​ | ​ | ​ | 4,089 |
| ORYX Southern Delaware Holdings LLC                        | ​ | ​ | ​         | ​ | ​ | Midstream               | ​ | ​ | L+325                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 2/28/25             | ​ | ​ | ​        | ​ | 17,905  | ​       | ​ | ​ | ​ | ​ | 17,989 | ​ | ​ | ​ | ​ | ​ | 17,670 |
| Panda Hummel Station LLC                                   | ​ | ​ | (f)             | ​ | ​ | Power                   | ​ | ​ | L+600                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 10/27/22            | ​ | ​ | ​        | ​ | 3,000   | ​       | ​ | ​ | ​ | ​ | 2,940 | ​ | ​ | ​ | ​ | ​ | 2,903 |
| Panda Hummel Station LLC                                   | ​ | ​ | (f)             | ​ | ​ | Power                   | ​ | ​ | L+600                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 10/27/22            | ​ | ​ | ​        | ​ | 17,000  | ​       | ​ | ​ | ​ | ​ | 16,660 | ​ | ​ | ​ | ​ | ​ | 16,448 |
| Panda Stonewall LLC                                        | ​ | ​ | (f)             | ​ | ​ | Power                   | ​ | ​ | L+550                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 11/13/21            | ​ | ​ | ​        | ​ | 15,000  | ​       | ​ | ​ | ​ | ​ | 15,113 | ​ | ​ | ​ | ​ | ​ | 15,113 |
| Permian Production Partners LLC                            | ​ | ​ | (h)(w)          | ​ | ​ | Upstream                | ​ | ​ | L+600                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 5/18/24             | ​ | ​ | ​        | ​ | 42,798  | ​       | ​ | ​ | ​ | ​ | 42,021 | ​ | ​ | ​ | ​ | ​ | 42,905 |
| Plainfield Renewable Energy Holdings LLC                   | ​ | ​ | (w)             | ​ | ​ | Power                   | ​ | ​ | 10.0%                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 8/22/25             | ​ | ​ | ​        | ​ | 2,500   | ​       | ​ | ​ | ​ | ​ | 2,500 | ​ | ​ | ​ | ​ | ​ | 2,500 |
| Plainfield Renewable Energy Holdings LLC, Letter of Credit | ​ | ​ | (e)(w)          | ​ | ​ | Power                   | ​ | ​ | 10.0%                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 8/22/25             | ​ | ​ | ​        | ​ | 2,709   | ​       | ​ | ​ | ​ | ​ | 2,709 | ​ | ​ | ​ | ​ | ​ | 2,709 |
| Plainfield Renewable Energy Holdings LLC                   | ​ | ​ | (w)             | ​ | ​ | Power                   | ​ | ​ | 15.5%                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 8/22/25             | ​ | ​ | ​        | ​ | 9,375   | ​       | ​ | ​ | ​ | ​ | 9,375 | ​ | ​ | ​ | ​ | ​ | 9,375 |
| Power Distribution, Inc.                                   | ​ | ​ | (w)(x)          | ​ | ​ | Power                   | ​ | ​ | L+725                           | ​ | ​ | ​ | ​ | 1.3%    | ​  | ​ | ​ | 1/25/23             | ​ | ​ | ​        | ​ | 29,423  | ​       | ​ | ​ | ​ | ​ | 29,423 | ​ | ​ | ​ | ​ | ​ | 29,901 |
| Strike, LLC                                                | ​ | ​ | (h)             | ​ | ​ | Midstream               | ​ | ​ | L+800                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 11/30/22            | ​ | ​ | ​        | ​ | 22,813  | ​       | ​ | ​ | ​ | ​ | 22,297 | ​ | ​ | ​ | ​ | ​ | 23,155 |
| Swift Worldwide Resources US Holdings Corp.                | ​ | ​ | (h)(w)(x)       | ​ | ​ | Service & Equipment | ​ | ​ | L+1000, 1.0% PIK (1.0% Max PIK) | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 7/20/21             | ​ | ​ | ​        | ​ | 58,469  | ​       | ​ | ​ | ​ | ​ | 58,469 | ​ | ​ | ​ | ​ | ​ | 59,639 |
| Traverse Midstream Partners LLC                            | ​ | ​ | (f)(h)          | ​ | ​ | Midstream               | ​ | ​ | L+400                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 9/27/24             | ​ | ​ | ​        | ​ | 84,172  | ​       | ​ | ​ | ​ | ​ | 84,662 | ​ | ​ | ​ | ​ | ​ | 84,917 |
| Ultra Resources, Inc.                                      | ​ | ​ | (f)             | ​ | ​ | Upstream                | ​ | ​ | L+300                           | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 4/12/24             | ​ | ​ | ​        | ​ | 42,000  | ​       | ​ | ​ | ​ | ​ | 37,807 | ​ | ​ | ​ | ​ | ​ | 37,966 |
| Warren Resources, Inc.                                     | ​ | ​ | (h)(w)(x)(y)    | ​ | ​ | Upstream                | ​ | ​ | L+1000, 1.0% PIK (1.0% Max PIK) | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 5/22/20             | ​ | ​ | ​        | ​ | 27,230  | ​       | ​ | ​ | ​ | ​ | 27,230 | ​ | ​ | ​ | ​ | ​ | 27,230 |
| Total Senior Secured Loans—First Lien                | ​ | ​ | ​         | ​ | ​ | ​                 | ​ | ​ | ​                         | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​             | ​ | ​ | ​        | ​ | ​ | ​       | ​ | ​ | ​ | ​ | 1,073,245 | ​ | ​ | ​ | ​ | ​ | 1,033,204 |
| Unfunded Loan Commitments                                  | ​ | ​ | ​         | ​ | ​ | ​                 | ​ | ​ | ​                         | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​             | ​ | ​ | ​        | ​ | ​ | ​       | ​ | ​ | ​ | ​ | (64,531) | ​ | ​ | ​ | ​ | ​ | (64,531) |
| Net Senior Secured Loans—First Lien                  | ​ | ​ | ​         | ​ | ​ | ​                 | ​ | ​ | ​                         | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​             | ​ | ​ | ​        | ​ | ​ | ​       | ​ | ​ | ​ | ​ | 1,008,714 | ​ | ​ | ​ | ​ | ​ | 968,673 |
| ​                                                    |

----

TABLE OF CONTENTS

| Portfolio Company(a)                               | ​ | ​ | Footnotes          | ​ | ​ | Industry                | ​ | ​ | Rate(b)                        | ​ | ​ | Floor   | ​ | ​ | Maturity | ​ | ​ | PrincipalAmount(c) | ​ | ​ | AmortizedCost | ​ | ​ | FairValue(d) | ​ |
|----------------------------------------------------|---------|---------|--------------------|---------|---------|-------------------------|---------|---------|--------------------------------|---------|---------|---------|---------|---------|----------|---------|---------|--------------------|---------|---------|---------------|---------|---------|--------------|---------|
| Senior Secured Loans—Second Lien—21.5% | ​ | ​ | ​            | ​ | ​ | ​                 | ​ | ​ | ​                        | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​      | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Aethon United BR LP                                | ​ | ​ | (h)(w)             | ​ | ​ | Upstream                | ​ | ​ | L+675                          | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 9/8/23             | ​ | ​ | ​       | $       | 103,919 | ​      | ​ | ​ | ​ | $ | 102,619 | ​ | ​ | ​ | ​ | $ | 104,563 | ​ | ​ |
| Aethon United BR LP                                | ​ | ​ | (e)(w)             | ​ | ​ | Upstream                | ​ | ​ | L+675                          | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 9/8/23             | ​ | ​ | ​       | ​ | 23,981  | ​      | ​ | ​ | ​ | ​ | 23,981 | ​ | ​ | ​ | ​ | ​ | 24,130 | ​ | ​ |
| Arena Energy, LP                                   | ​ | ​ | (h)(w)(x)          | ​ | ​ | Upstream                | ​ | ​ | L+900, 4.0% PIK (4.0% Max PIK) | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 1/24/21            | ​ | ​ | ​       | ​ | 110,955 | ​      | ​ | ​ | ​ | ​ | 110,955 | ​ | ​ | ​ | ​ | ​ | 110,955 | ​ | ​ |
| Bellatrix Exploration Ltd.                         | ​ | ​ | (k)(w)             | ​ | ​ | Upstream                | ​ | ​ | 8.5%                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 7/26/23            | ​ | ​ | ​       | ​ | 11,256  | ​      | ​ | ​ | ​ | ​ | 11,256 | ​ | ​ | ​ | ​ | ​ | 11,284 | ​ | ​ |
| Bellatrix Exploration Ltd.                         | ​ | ​ | (e)(k)(w)          | ​ | ​ | Upstream                | ​ | ​ | 8.5%                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 7/26/23            | ​ | ​ | ​       | ​ | 18,759  | ​      | ​ | ​ | ​ | ​ | 18,759 | ​ | ​ | ​ | ​ | ​ | 18,806 | ​ | ​ |
| Bellatrix Exploration Ltd.                         | ​ | ​ | (k)(w)(x)          | ​ | ​ | Upstream                | ​ | ​ | 8.5%                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 7/26/23            | ​ | ​ | ​       | ​ | 54,108  | ​      | ​ | ​ | ​ | ​ | 48,120 | ​ | ​ | ​ | ​ | ​ | 47,886 | ​ | ​ |
| Chisholm Oil and Gas Operating, LLC                | ​ | ​ | (h)(w)(x)          | ​ | ​ | Upstream                | ​ | ​ | L+800                          | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 3/21/24            | ​ | ​ | ​       | ​ | 196,000 | ​      | ​ | ​ | ​ | ​ | 196,000 | ​ | ​ | ​ | ​ | ​ | 194,569 | ​ | ​ |
| Encino Acquisition Partners Holdings LLC           | ​ | ​ | (f)                | ​ | ​ | Upstream                | ​ | ​ | L+675                          | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 9/26/25            | ​ | ​ | ​       | ​ | 20,000  | ​      | ​ | ​ | ​ | ​ | 19,800 | ​ | ​ | ​ | ​ | ​ | 20,100 | ​ | ​ |
| Granite Acquisition, Inc.                          | ​ | ​ | (x)                | ​ | ​ | Power                   | ​ | ​ | L+725                          | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 12/19/22           | ​ | ​ | ​       | ​ | 22,331  | ​      | ​ | ​ | ​ | ​ | 22,061 | ​ | ​ | ​ | ​ | ​ | 22,554 | ​ | ​ |
| Horn Intermediate Holdings, Inc.                   | ​ | ​ | (h)(w)(x)          | ​ | ​ | Service & Equipment | ​ | ​ | L+775                          | ​ | ​ | ​ | ​ | 1.3%    | ​  | ​ | ​ | 10/2/18            | ​ | ​ | ​       | ​ | 50,250  | ​      | ​ | ​ | ​ | ​ | 50,050 | ​ | ​ | ​ | ​ | ​ | 50,250 | ​ | ​ |
| Penn Virginia Holdings Corp.                       | ​ | ​ | (h)(k)(w)          | ​ | ​ | Upstream                | ​ | ​ | L+700                          | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 9/29/22            | ​ | ​ | ​       | ​ | 20,000  | ​      | ​ | ​ | ​ | ​ | 20,000 | ​ | ​ | ​ | ​ | ​ | 20,300 | ​ | ​ |
| Rosehill Operating Company, LLC                    | ​ | ​ | (w)(x)             | ​ | ​ | Upstream                | ​ | ​ | 10.0%                          | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 1/31/23            | ​ | ​ | ​       | ​ | 1,667   | ​      | ​ | ​ | ​ | ​ | 1,651 | ​ | ​ | ​ | ​ | ​ | 1,706 | ​ | ​ |
| SilverBow Resources, Inc.                          | ​ | ​ | (h)(k)(w)          | ​ | ​ | Upstream                | ​ | ​ | L+750                          | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 12/15/24           | ​ | ​ | ​       | ​ | 19,000  | ​      | ​ | ​ | ​ | ​ | 18,827 | ​ | ​ | ​ | ​ | ​ | 19,072 | ​ | ​ |
| Titan Energy Operating, LLC                        | ​ | ​ | (m)(o)(w)(x)(y)    | ​ | ​ | Upstream                | ​ | ​ | L+1300 PIK (L+1300 Max PIK)    | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 2/23/20            | ​ | ​ | ​       | ​ | 129,586 | ​      | ​ | ​ | ​ | ​ | 100,902 | ​ | ​ | ​ | ​ | ​ | 19,956 | ​ | ​ |
| Total Senior Secured Loans—Second Lien       | ​ | ​ | ​            | ​ | ​ | ​                 | ​ | ​ | ​                        | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​      | ​ | ​ | ​ | ​ | 744,981 | ​ | ​ | ​ | ​ | ​ | 666,131 | ​ | ​ |
| Unfunded Loan Commitments                          | ​ | ​ | ​            | ​ | ​ | ​                 | ​ | ​ | ​                        | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​      | ​ | ​ | ​ | ​ | (42,740) | ​ | ​ | ​ | ​ | ​ | (42,740) | ​ | ​ |
| Net Senior Secured Loans—Second Lien         | ​ | ​ | ​            | ​ | ​ | ​                 | ​ | ​ | ​                        | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​      | ​ | ​ | ​ | ​ | 702,241 | ​ | ​ | ​ | ​ | ​ | 623,391 | ​ | ​ |
| Senior Secured Bonds—19.6%                   | ​ | ​ | ​            | ​ | ​ | ​                 | ​ | ​ | ​                        | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​      | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Black Swan Energy Ltd.                             | ​ | ​ | (h)(k)(w)(x)       | ​ | ​ | Upstream                | ​ | ​ | 9.0%                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 1/20/24            | ​ | ​ | ​       | ​ | 90,000  | ​      | ​ | ​ | ​ | ​ | 90,000 | ​ | ​ | ​ | ​ | ​ | 90,000 | ​ | ​ |
| Denbury Resources Inc.                             | ​ | ​ | (k)                | ​ | ​ | Upstream                | ​ | ​ | 7.5%                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 2/15/24            | ​ | ​ | ​       | ​ | 20,000  | ​      | ​ | ​ | ​ | ​ | 19,994 | ​ | ​ | ​ | ​ | ​ | 20,666 | ​ | ​ |
| Denbury Resources Inc.                             | ​ | ​ | (k)                | ​ | ​ | Upstream                | ​ | ​ | 7.5%                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 3/31/22            | ​ | ​ | ​       | ​ | 27,341  | ​      | ​ | ​ | ​ | ​ | 29,162 | ​ | ​ | ​ | ​ | ​ | 29,494 | ​ | ​ |
| FourPoint Energy, LLC                              | ​ | ​ | (h)(i)(j)(w)(x)(y) | ​ | ​ | Upstream                | ​ | ​ | 9.0%                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 12/31/21           | ​ | ​ | ​       | ​ | 235,125 | ​      | ​ | ​ | ​ | ​ | 228,468 | ​ | ​ | ​ | ​ | ​ | 237,476 | ​ | ​ |
| Sunnova Energy Corp.                               | ​ | ​ | (h)(w)(y)          | ​ | ​ | Power                   | ​ | ​ | 6.0%, 6.0% PIK (6.0% Max PIK)  | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 1/24/19            | ​ | ​ | ​       | ​ | 26,406  | ​      | ​ | ​ | ​ | ​ | 26,406 | ​ | ​ | ​ | ​ | ​ | 26,373 | ​ | ​ |
| Talos Production LLC                               | ​ | ​ | (i)(x)             | ​ | ​ | Upstream                | ​ | ​ | 11.0%                          | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 4/3/22             | ​ | ​ | ​       | ​ | 36,250  | ​      | ​ | ​ | ​ | ​ | 37,980 | ​ | ​ | ​ | ​ | ​ | 38,923 | ​ | ​ |
| Velvet Energy Ltd.                                 | ​ | ​ | (h)(k)(w)          | ​ | ​ | Upstream                | ​ | ​ | 9.0%                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 10/5/23            | ​ | ​ | ​       | ​ | 120,000 | ​      | ​ | ​ | ​ | ​ | 120,000 | ​ | ​ | ​ | ​ | ​ | 125,400 | ​ | ​ |
| Total Senior Secured Bonds                         | ​ | ​ | ​            | ​ | ​ | ​                 | ​ | ​ | ​                        | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​      | ​ | ​ | ​ | ​ | 552,010 | ​ | ​ | ​ | ​ | ​ | 568,332 | ​ | ​ |
| ​                                            |

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TABLE OF CONTENTS

| Portfolio Company(a)                   | ​ | ​ | Footnotes       | ​ | ​ | Industry    | ​ | ​ | Rate(b)                   | ​ | ​ | Floor   | ​ | ​ | Maturity | ​ | ​ | PrincipalAmount(c) | ​ | ​ | AmortizedCost | ​ | ​ | FairValue(d) | ​ |
|----------------------------------------|---------|---------|-----------------|---------|---------|-------------|---------|---------|---------------------------|---------|---------|---------|---------|---------|----------|---------|---------|--------------------|---------|---------|---------------|---------|---------|--------------|---------|
| Subordinated Debt—26.8%          | ​ | ​ | ​         | ​ | ​ | ​     | ​ | ​ | ​                   | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​      | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Amerigas—Amerigas Partners, L.P. | ​ | ​ | (k)(x)          | ​ | ​ | Midstream   | ​ | ​ | 5.8%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 5/20/27            | ​ | ​ | ​       | $       | 13,267  | ​      | ​ | ​ | ​ | $ | 13,033 | ​ | ​ | ​ | ​ | $ | 13,085 | ​ | ​ |
| Amerigas—Amerigas Partners, L.P. | ​ | ​ | (k)(x)          | ​ | ​ | Midstream   | ​ | ​ | 5.9%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 8/20/26            | ​ | ​ | ​       | ​ | 4,508   | ​      | ​ | ​ | ​ | ​ | 4,461 | ​ | ​ | ​ | ​ | ​ | 4,489 | ​ | ​ |
| Archrock Partners, L.P.                | ​ | ​ | (k)             | ​ | ​ | Midstream   | ​ | ​ | 6.0%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 10/1/22            | ​ | ​ | ​       | ​ | 1,333   | ​      | ​ | ​ | ​ | ​ | 1,348 | ​ | ​ | ​ | ​ | ​ | 1,351 | ​ | ​ |
| Archrock Partners, L.P.                | ​ | ​ | (k)             | ​ | ​ | Midstream   | ​ | ​ | 6.0%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 4/1/21             | ​ | ​ | ​       | ​ | 5,690   | ​      | ​ | ​ | ​ | ​ | 5,732 | ​ | ​ | ​ | ​ | ​ | 5,725 | ​ | ​ |
| Ascent Resources Utica Holdings, LLC   | ​ | ​ | (x)             | ​ | ​ | Upstream    | ​ | ​ | 10.0%                     | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 4/1/22             | ​ | ​ | ​       | ​ | 158,000 | ​      | ​ | ​ | ​ | ​ | 158,000 | ​ | ​ | ​ | ​ | ​ | 178,046 | ​ | ​ |
| Bruin E&P Partners, LLC            | ​ | ​ | (x)             | ​ | ​ | Upstream    | ​ | ​ | 8.9%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 8/1/23             | ​ | ​ | ​       | ​ | 24,250  | ​      | ​ | ​ | ​ | ​ | 23,675 | ​ | ​ | ​ | ​ | ​ | 25,125 | ​ | ​ |
| Canbriam Energy Inc.                   | ​ | ​ | (h)(k)(x)       | ​ | ​ | Upstream    | ​ | ​ | 9.8%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 11/15/19           | ​ | ​ | ​       | ​ | 109,790 | ​      | ​ | ​ | ​ | ​ | 108,631 | ​ | ​ | ​ | ​ | ​ | 109,516 | ​ | ​ |
| Compressco Partners, LP                | ​ | ​ | (x)             | ​ | ​ | Midstream   | ​ | ​ | 7.3%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 8/15/22            | ​ | ​ | ​       | ​ | 19,050  | ​      | ​ | ​ | ​ | ​ | 18,953 | ​ | ​ | ​ | ​ | ​ | 17,717 | ​ | ​ |
| Covey Park Energy LLC                  | ​ | ​ | (x)             | ​ | ​ | Upstream    | ​ | ​ | 7.5%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 5/15/25            | ​ | ​ | ​       | ​ | 59,289  | ​      | ​ | ​ | ​ | ​ | 59,709 | ​ | ​ | ​ | ​ | ​ | 60,319 | ​ | ​ |
| Endeavor Energy Resources, LP          | ​ | ​ | ​         | ​ | ​ | Upstream    | ​ | ​ | 5.5%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 1/30/26            | ​ | ​ | ​       | ​ | 9,869   | ​      | ​ | ​ | ​ | ​ | 9,721 | ​ | ​ | ​ | ​ | ​ | 9,901 | ​ | ​ |
| Global Jet Capital Holdings, LP        | ​ | ​ | (w)(x)          | ​ | ​ | Industrials | ​ | ​ | 15.0% PIK (15.0% Max PIK) | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 1/30/25            | ​ | ​ | ​       | ​ | 950     | ​      | ​ | ​ | ​ | ​ | 950 | ​ | ​ | ​ | ​ | ​ | 941 | ​ | ​ |
| Global Jet Capital Holdings, LP        | ​ | ​ | (w)(x)          | ​ | ​ | Industrials | ​ | ​ | 15.0% PIK (15.0% Max PIK) | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 4/30/25            | ​ | ​ | ​       | ​ | 6,035   | ​      | ​ | ​ | ​ | ​ | 6,035 | ​ | ​ | ​ | ​ | ​ | 5,983 | ​ | ​ |
| Global Jet Capital Holdings, LP        | ​ | ​ | (w)(x)          | ​ | ​ | Industrials | ​ | ​ | 15.0% PIK (15.0% Max PIK) | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 9/3/25             | ​ | ​ | ​       | ​ | 1,247   | ​      | ​ | ​ | ​ | ​ | 1,247 | ​ | ​ | ​ | ​ | ​ | 1,235 | ​ | ​ |
| Global Jet Capital Holdings, LP        | ​ | ​ | (w)(x)          | ​ | ​ | Industrials | ​ | ​ | 15.0% PIK (15.0% Max PIK) | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 9/29/25            | ​ | ​ | ​       | ​ | 1,174   | ​      | ​ | ​ | ​ | ​ | 1,174 | ​ | ​ | ​ | ​ | ​ | 1,162 | ​ | ​ |
| Global Jet Capital Holdings, LP        | ​ | ​ | (w)(x)          | ​ | ​ | Industrials | ​ | ​ | 15.0% PIK (15.0% Max PIK) | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 12/2/26            | ​ | ​ | ​       | ​ | 1,033   | ​      | ​ | ​ | ​ | ​ | 1,033 | ​ | ​ | ​ | ​ | ​ | 1,020 | ​ | ​ |
| Great Western Petroleum, LLC           | ​ | ​ | (w)(x)          | ​ | ​ | Upstream    | ​ | ​ | 8.5%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 4/15/25            | ​ | ​ | ​       | ​ | 13,636  | ​      | ​ | ​ | ​ | ​ | 12,978 | ​ | ​ | ​ | ​ | ​ | 12,426 | ​ | ​ |
| Great Western Petroleum, LLC           | ​ | ​ | (w)(x)          | ​ | ​ | Upstream    | ​ | ​ | 9.0%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 9/30/21            | ​ | ​ | ​       | ​ | 35,830  | ​      | ​ | ​ | ​ | ​ | 35,736 | ​ | ​ | ​ | ​ | ​ | 35,185 | ​ | ​ |
| Hammerhead Resources Inc.              | ​ | ​ | (h)(k)(x)       | ​ | ​ | Upstream    | ​ | ​ | 9.0%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 7/10/22            | ​ | ​ | ​       | ​ | 100,000 | ​      | ​ | ​ | ​ | ​ | 97,587 | ​ | ​ | ​ | ​ | ​ | 96,750 | ​ | ​ |
| Hilcorp Energy I, L.P.                 | ​ | ​ | ​         | ​ | ​ | Upstream    | ​ | ​ | 5.0%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 12/1/24            | ​ | ​ | ​       | ​ | 4,378   | ​      | ​ | ​ | ​ | ​ | 4,252 | ​ | ​ | ​ | ​ | ​ | 4,264 | ​ | ​ |
| Hilcorp Energy I, L.P.                 | ​ | ​ | ​         | ​ | ​ | Upstream    | ​ | ​ | 5.8%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 10/1/25            | ​ | ​ | ​       | ​ | 7,067   | ​      | ​ | ​ | ​ | ​ | 7,088 | ​ | ​ | ​ | ​ | ​ | 7,102 | ​ | ​ |
| Lonestar Resources America Inc.        | ​ | ​ | (x)             | ​ | ​ | Upstream    | ​ | ​ | 11.3%                     | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 1/1/23             | ​ | ​ | ​       | ​ | 37,500  | ​      | ​ | ​ | ​ | ​ | 38,587 | ​ | ​ | ​ | ​ | ​ | 41,266 | ​ | ​ |
| Martin Midstream Partners L.P.         | ​ | ​ | (k)(x)          | ​ | ​ | Midstream   | ​ | ​ | 7.3%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 2/15/21            | ​ | ​ | ​       | ​ | 12,723  | ​      | ​ | ​ | ​ | ​ | 12,183 | ​ | ​ | ​ | ​ | ​ | 12,729 | ​ | ​ |
| Moss Creek Resources, LLC              | ​ | ​ | (x)             | ​ | ​ | Upstream    | ​ | ​ | 7.5%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 1/15/26            | ​ | ​ | ​       | ​ | 40,500  | ​      | ​ | ​ | ​ | ​ | 40,385 | ​ | ​ | ​ | ​ | ​ | 40,434 | ​ | ​ |
| Suburban Propane Partners LP           | ​ | ​ | (k)             | ​ | ​ | Midstream   | ​ | ​ | 5.8%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 3/1/25             | ​ | ​ | ​       | ​ | 8,433   | ​      | ​ | ​ | ​ | ​ | 8,210 | ​ | ​ | ​ | ​ | ​ | 8,191 | ​ | ​ |
| Suburban Propane Partners LP           | ​ | ​ | (k)             | ​ | ​ | Midstream   | ​ | ​ | 5.9%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 3/1/27             | ​ | ​ | ​       | ​ | 34,858  | ​      | ​ | ​ | ​ | ​ | 32,850 | ​ | ​ | ​ | ​ | ​ | 33,289 | ​ | ​ |
| Tenrgys, LLC                           | ​ | ​ | (i)(m)(o)(w)(x) | ​ | ​ | Upstream    | ​ | ​ | L+900                     | ​ | ​ | ​ | ​ | 2.5%    | ​  | ​ | ​ | 12/23/18           | ​ | ​ | ​       | ​ | 75,000  | ​      | ​ | ​ | ​ | ​ | 75,000 | ​ | ​ | ​ | ​ | ​ | 50,906 | ​ | ​ |
| Total Subordinated Debt                | ​ | ​ | ​         | ​ | ​ | ​     | ​ | ​ | ​                   | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​      | ​ | ​ | ​ | ​ | 778,558 | ​ | ​ | ​ | ​ | ​ | 778,157 | ​ | ​ |
| ​                                |

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TABLE OF CONTENTS

| Portfolio Company(a)                                            | ​ | ​ | Footnotes             | ​ | ​ | Industry                | ​ | ​ | Rate(b)                       | ​ | ​ | Maturity | ​ | ​  | Number of Shares | ​ | ​ | Amortized Cost | ​ | ​     | Fair Value(d) | ​ |
|-----------------------------------------------------------------|---------|---------|-----------------------|---------|---------|-------------------------|---------|---------|-------------------------------|---------|---------|----------|---------|----------|------------------|---------|---------|----------------|---------|-------------|---------------|---------|
| Equity/Other—27.2%(l)                                     | ​ | ​ | ​               | ​ | ​ | ​                 | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | ​     | ​       | ​ | ​ | ​ |
| Abaco Energy Technologies LLC, Common Equity                    | ​ | ​ | (o)(w)(x)             | ​ | ​ | Service & Equipment | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 6,944,444   | ​       | ​ | ​ | ​ | $ | 6,944 | ​ | ​ | ​ | ​ | $ | 3,038 | ​ | ​ |
| Abaco Energy Technologies LLC, Preferred Equity                 | ​ | ​ | (o)(w)(x)             | ​ | ​ | Service & Equipment | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 28,942,003  | ​       | ​ | ​ | ​ | ​ | 1,447 | ​ | ​ | ​ | ​ | ​ | 15,195 | ​ | ​ |
| Allied Downhole Technologies, LLC, Common Equity                | ​ | ​ | (i)(n)(o)(w)(x)       | ​ | ​ | Service & Equipment | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 7,431,113   | ​       | ​ | ​ | ​ | ​ | 7,223 | ​ | ​ | ​ | ​ | ​ | 10,218 | ​ | ​ |
| Allied Downhole Technologies, LLC, Warrants, 2/28/19            | ​ | ​ | (i)(n)(o)(w)(x)       | ​ | ​ | Service & Equipment | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 5,344,680   | ​       | ​ | ​ | ​ | ​ | 1,865 | ​ | ​ | ​ | ​ | ​ | 7,349 | ​ | ​ |
| Altus Power America Holdings, LLC, Common Equity                | ​ | ​ | (i)(o)(p)(w)(x)(y)    | ​ | ​ | Power                   | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 12,474,205  | ​       | ​ | ​ | ​ | ​ | 12,474 | ​ | ​ | ​ | ​ | ​ | 1,871 | ​ | ​ |
| Altus Power America Holdings, LLC, Preferred Equity             | ​ | ​ | (i)(w)(x)(y)          | ​ | ​ | Power                   | ​ | ​ | 9.0%, 5.0% PIK (5.0% Max PIK) | ​ | ​ | ​  | ​ | 10/3/23  | ​          | ​ | ​ | ​        | ​ | 27,987,805  | ​       | ​ | ​ | ​ | ​ | 27,988 | ​ | ​ | ​ | ​ | ​ | 27,008 | ​ | ​ |
| Ascent Resources Utica Holdings, LLC, Common Equity             | ​ | ​ | (o)(q)(w)(x)          | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 148,692,909 | ​       | ​ | ​ | ​ | ​ | 44,700 | ​ | ​ | ​ | ​ | ​ | 47,582 | ​ | ​ |
| BL Sand Hills Unit, L.P., Net Profits Interest                  | ​ | ​ | (o)(s)(w)(x)(y)       | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | N/A         | ​       | ​ | ​ | ​ | ​ | 5,180 | ​ | ​ | ​ | ​ | ​ | 1,077 | ​ | ​ |
| BL Sand Hills Unit, L.P., Overriding Royalty Interest           | ​ | ​ | (s)(w)(x)(y)          | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | N/A         | ​       | ​ | ​ | ​ | ​ | 740 | ​ | ​ | ​ | ​ | ​ | 741 | ​ | ​ |
| BL Sand Hills Unit, L.P., Series A Units                   | ​ | ​ | (g)(o)(w)(x)(y)       | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 29,117      | ​       | ​ | ​ | ​ | ​ | 24,019 | ​ | ​ | ​ | ​ | ​ | 4,840 | ​ | ​ |
| Chisholm Oil and Gas, LLC, Series A Units                  | ​ | ​ | (g)(o)(w)(x)          | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 14,700,000  | ​       | ​ | ​ | ​ | ​ | 14,700 | ​ | ​ | ​ | ​ | ​ | 13,627 | ​ | ​ |
| Cimarron Energy Holdco Inc., Common Equity                      | ​ | ​ | (o)(w)(x)             | ​ | ​ | Service & Equipment | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 3,675,487   | ​       | ​ | ​ | ​ | ​ | 3,323 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Cimarron Energy Holdco Inc., Preferred Equity                   | ​ | ​ | (o)(w)(x)             | ​ | ​ | Service & Equipment | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 626,806     | ​       | ​ | ​ | ​ | ​ | 627 | ​ | ​ | ​ | ​ | ​ | 172 | ​ | ​ |
| FourPoint Energy, LLC, Common Equity, Class C-II-A Units   | ​ | ​ | (i)(n)(o)(w)(x)(y)    | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 66,000      | ​       | ​ | ​ | ​ | ​ | 66,000 | ​ | ​ | ​ | ​ | ​ | 18,645 | ​ | ​ |
| FourPoint Energy, LLC, Common Equity, Class D Units        | ​ | ​ | (i)(n)(o)(w)(x)(y)    | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 12,374      | ​       | ​ | ​ | ​ | ​ | 8,176 | ​ | ​ | ​ | ​ | ​ | 3,527 | ​ | ​ |
| FourPoint Energy, LLC, Common Equity, Class E-II Units     | ​ | ​ | (g)(o)(w)(x)(y)       | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 150,937     | ​       | ​ | ​ | ​ | ​ | 37,734 | ​ | ​ | ​ | ​ | ​ | 42,451 | ​ | ​ |
| FourPoint Energy, LLC, Common Equity, Class E-III Units    | ​ | ​ | (g)(i)(n)(o)(w)(x)(y) | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 222,750     | ​       | ​ | ​ | ​ | ​ | 55,688 | ​ | ​ | ​ | ​ | ​ | 62,927 | ​ | ​ |
| Global Jet Capital Holdings, LP, Preferred Equity               | ​ | ​ | (o)(w)(x)             | ​ | ​ | Industrials             | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 2,785,562   | ​       | ​ | ​ | ​ | ​ | 2,786 | ​ | ​ | ​ | ​ | ​ | 1,017 | ​ | ​ |
| Great Western Petroleum, LLC, Preferred Equity                  | ​ | ​ | (i)(n)(w)(x)          | ​ | ​ | Upstream                | ​ | ​ | 15.5%                         | ​ | ​ | ​  | ​ | 12/31/27 | ​          | ​ | ​ | ​        | ​ | 36,363      | ​       | ​ | ​ | ​ | ​ | 37,419 | ​ | ​ | ​ | ​ | ​ | 35,744 | ​ | ​ |
| Harvest Oil & Gas Corp., Common Equity                      | ​ | ​ | (o)(w)(x)(y)          | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 1,350,620   | ​       | ​ | ​ | ​ | ​ | 29,714 | ​ | ​ | ​ | ​ | ​ | 27,012 | ​ | ​ |
| Industrial Group Intermediate Holdings, LLC, Common Equity      | ​ | ​ | (i)(n)(o)(w)(x)       | ​ | ​ | Industrials             | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 472,755     | ​       | ​ | ​ | ​ | ​ | 473 | ​ | ​ | ​ | ​ | ​ | 425 | ​ | ​ |
| JSS Holdco, LLC, Net Profits Interest                           | ​ | ​ | (o)(w)(x)             | ​ | ​ | Industrials             | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | N/A         | ​       | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 148 | ​ | ​ |
| Lusk Operating LLC, Common Equity                               | ​ | ​ | (o)(r)(w)(x)(z)       | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 2,000       | ​       | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| MB Precision Investment Holdings LLC, Class A-2 Units | ​ | ​ | (i)(n)(o)(w)(x)       | ​ | ​ | Industrials             | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 490,213     | ​       | ​ | ​ | ​ | ​ | 490 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| New Age (African Global Energy) Limited, Warrants, 6/28/26      | ​ | ​ | (k)(o)(w)(x)          | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 32,423      | ​       | ​ | ​ | ​ | ​ | 19 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| NuStar, Preferred Equity                                        | ​ | ​ | (k)(w)(x)             | ​ | ​ | Midstream               | ​ | ​ | 12.8%                         | ​ | ​ | ​  | ​ | 6/29/28  | ​          | ​ | ​ | ​        | ​ | 5,910,165   | ​       | ​ | ​ | ​ | ​ | 145,777 | ​ | ​ | ​ | ​ | ​ | 171,785 | ​ | ​ |
| PDI Parent LLC, Common Equity                                   | ​ | ​ | (o)(w)(x)             | ​ | ​ | Power                   | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 1,384,615   | ​       | ​ | ​ | ​ | ​ | 1,385 | ​ | ​ | ​ | ​ | ​ | 1,142 | ​ | ​ |
| Ridgeback Resources Inc., Common Equity                         | ​ | ​ | (j)(k)(o)(t)(w)(x)(y) | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 9,599,928   | ​       | ​ | ​ | ​ | ​ | 58,985 | ​ | ​ | ​ | ​ | ​ | 66,297 | ​ | ​ |
| Rosehill Resources, Inc. Preferred Equity                       | ​ | ​ | (o)(w)(x)             | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 2,536       | ​       | ​ | ​ | ​ | ​ | 2,511 | ​ | ​ | ​ | ​ | ​ | 2,630 | ​ | ​ |
| Segreto Power Holdings, LLC, Preferred Equity                   | ​ | ​ | (g)(w)(x)             | ​ | ​ | Power                   | ​ | ​ | 13.1%                         | ​ | ​ | ​  | ​ | 5/8/25   | ​          | ​ | ​ | ​        | ​ | 70,297      | ​       | ​ | ​ | ​ | ​ | 69,214 | ​ | ​ | ​ | ​ | ​ | 72,839 | ​ | ​ |
| Sunnova Energy Corp., Common Equity                             | ​ | ​ | (o)(w)(x)(y)          | ​ | ​ | Power                   | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 6,667,368   | ​       | ​ | ​ | ​ | ​ | 25,026 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Sunnova Energy Corp., Preferred Equity                          | ​ | ​ | (o)(w)(x)(y)          | ​ | ​ | Power                   | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 1,117,214   | ​       | ​ | ​ | ​ | ​ | 5,948 | ​ | ​ | ​ | ​ | ​ | 6,457 | ​ | ​ |
| Swift Worldwide Resources Holdco Limited, Common Equity         | ​ | ​ | (k)(o)(u)(w)(x)       | ​ | ​ | Service & Equipment | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 3,750,000   | ​       | ​ | ​ | ​ | ​ | 6,029 | ​ | ​ | ​ | ​ | ​ | 2,625 | ​ | ​ |
| Synergy Offshore LLC, Preferred Equity                          | ​ | ​ | (i)(m)(o)(v)(w)(x)    | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 71,131      | ​       | ​ | ​ | ​ | ​ | 93,009 | ​ | ​ | ​ | ​ | ​ | 26,247 | ​ | ​ |
| TE Holdings, LLC, Common Equity                                 | ​ | ​ | (g)(o)(x)             | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 2,225,950   | ​       | ​ | ​ | ​ | ​ | 18,921 | ​ | ​ | ​ | ​ | ​ | 2,226 | ​ | ​ |
| TE Holdings, LLC, Preferred Equity                              | ​ | ​ | (j)(o)(x)             | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 1,475,531   | ​       | ​ | ​ | ​ | ​ | 14,734 | ​ | ​ | ​ | ​ | ​ | 9,591 | ​ | ​ |
| The Brock Group, Inc., Common Equity                            | ​ | ​ | (j)(o)(w)(x)          | ​ | ​ | Service & Equipment | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 786,094     | ​       | ​ | ​ | ​ | ​ | 15,617 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Titan Energy, LLC, Common Equity                                | ​ | ​ | (i)(o)(x)(y)          | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 555,496     | ​       | ​ | ​ | ​ | ​ | 17,554 | ​ | ​ | ​ | ​ | ​ | 228 | ​ | ​ |
| USA Compression Partners, LP, Preferred Equity                  | ​ | ​ | (k)(w)(x)             | ​ | ​ | Midstream               | ​ | ​ | 9.8%                          | ​ | ​ | ​  | ​ | 4/3/28   | ​          | ​ | ​ | ​        | ​ | 79,336      | ​       | ​ | ​ | ​ | ​ | 77,333 | ​ | ​ | ​ | ​ | ​ | 82,196 | ​ | ​ |
| USA Compression Partners, LP, Warrants (Market), 4/3/28         | ​ | ​ | (k)(o)(w)(x)          | ​ | ​ | Midstream               | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 793,359     | ​       | ​ | ​ | ​ | ​ | 555 | ​ | ​ | ​ | ​ | ​ | 801 | ​ | ​ |
| USA Compression Partners, LP, Warrants (Premium), 4/3/28        | ​ | ​ | (k)(o)(w)(x)          | ​ | ​ | Midstream               | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 1,586,719   | ​       | ​ | ​ | ​ | ​ | 714 | ​ | ​ | ​ | ​ | ​ | 809 | ​ | ​ |
| Warren Resources, Inc., Common Equity                           | ​ | ​ | (j)(o)(w)(x)(y)       | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 4,415,749   | ​       | ​ | ​ | ​ | ​ | 20,754 | ​ | ​ | ​ | ​ | ​ | 16,780 | ​ | ​ |
| White Star Petroleum Holdings, LLC, Common Equity               | ​ | ​ | (g)(o)(w)(x)          | ​ | ​ | Upstream                | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | 4,867,084   | ​       | ​ | ​ | ​ | ​ | 4,137 | ​ | ​ | ​ | ​ | ​ | 2,069 | ​ | ​ |
| Total Equity/Other                                              | ​ | ​ | ​               | ​ | ​ | ​                 | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | ​     | ​       | ​ | ​ | ​ | ​ | 967,932 | ​ | ​ | ​ | ​ | ​ | 789,336 | ​ | ​ |
| TOTAL INVESTMENTS—128.5%                                  | ​ | ​ | ​               | ​ | ​ | ​                 | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | ​     | ​       | ​ | ​ | ​ | $ | 4,009,455 | ​ | ​ | ​ | ​ | ​ | 3,727,889 | ​ | ​ |
| LIABILITIES IN EXCESS OF OTHER ASSETS—(28.5%)             | ​ | ​ | ​               | ​ | ​ | ​                 | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | ​     | ​       | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (827,053) | ​ | ​ |
| NET ASSETS—100.0%                                         | ​ | ​ | ​               | ​ | ​ | ​                 | ​ | ​ | ​                       | ​ | ​ | ​  | ​ | ​  | ​          | ​ | ​ | ​        | ​ | ​     | ​       | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 2,900,836 | ​ | ​ |
| ​                                                         |

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TABLE OF CONTENTS

| Portfolio Company                                             | ​ | ​ | Fair Value at December 31, 2017 | ​ | ​ | Purchases, Paid-in-Kind Interest and Transfers In | ​ | ​ | Sales, Repayments and Transfers Out | ​ | ​ | Accretion of Discount | ​ | ​ | Net Realized Gain (Loss) | ​ | ​  | Net Change in Unrealized Appreciation (Depreciation) | ​ | ​ | Fair Value at September 30, 2018 | ​ | ​ | Interest Income(2) | ​ | ​ | PIK Income(2) | ​ | ​ | Fee Income(2) | ​ |
|---------------------------------------------------------------|---------|---------|--------------------------------------|---------|---------|---------------------------------------------------|---------|---------|-------------------------------------|---------|---------|-----------------------|---------|---------|--------------------------|---------|----------|------------------------------------------------------|---------|---------|---------------------------------------|---------|---------|--------------------|---------|---------|---------------|---------|---------|---------------|---------|
| Senior Secured Loans—First Lien                         | ​ | ​ | ​                              | ​ | ​ | ​                                           | ​ | ​ | ​                             | ​ | ​ | ​               | ​ | ​ | ​                  | ​ | ​  | ​                                              | ​ | ​ | ​                               | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​       | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Altus Power America, Inc.(1)                                  | ​ | ​ | ​                              | $       | 75,353  | ​                                           | ​ | ​ | ​                             | $       | 6,585   | ​               | ​ | ​ | ​                  | $       | —  | ​                                              | ​ | ​ | ​                               | $       | — | ​            | ​ | ​ | ​       | $       | — | ​       | ​ | ​ | ​ | $ | (666) | ​ | ​ | ​ | ​ | $ | 81,272 | ​ | ​ | ​ | ​ | $ | 5,833 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ |
| BL Sand Hills Unit, L.P.                                      | ​ | ​ | ​                              | ​ | 20,000  | ​                                           | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —  | ​                                              | ​ | ​ | ​                               | ​ | 32      | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (32) | ​ | ​ | ​ | ​ | ​ | 20,000 | ​ | ​ | ​ | ​ | ​ | 1,720 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Warren Resources, Inc.                                        | ​ | ​ | ​                              | ​ | 81,214  | ​                                           | ​ | ​ | ​                             | ​ | 262     | ​               | ​ | ​ | ​                  | ​ | (52,265) | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (1,981) | ​ | ​ | ​ | ​ | ​ | 27,230 | ​ | ​ | ​ | ​ | ​ | 2,822 | ​ | ​ | ​ | ​ | ​ | 262 | ​ | ​ | ​ | ​ | ​ | 2,091 | ​ | ​ |
| Senior Secured Loans—Second Lien                        | ​ | ​ | ​                              | ​ | ​ | ​                                           | ​ | ​ | ​                             | ​ | ​ | ​               | ​ | ​ | ​                  | ​ | ​  | ​                                              | ​ | ​ | ​                               | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​       | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Titan Energy Operating, LLC                                   | ​ | ​ | ​                              | ​ | 62,026  | ​                                           | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —  | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (42,070) | ​ | ​ | ​ | ​ | ​ | 19,956 | ​ | ​ | ​ | ​ | ​ | 895 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Senior Secured Bonds                                          | ​ | ​ | ​                              | ​ | ​ | ​                                           | ​ | ​ | ​                             | ​ | ​ | ​               | ​ | ​ | ​                  | ​ | ​  | ​                                              | ​ | ​ | ​                               | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​       | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| FourPoint Energy, LLC                                         | ​ | ​ | ​                              | ​ | 238,946 | ​                                           | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | (1,485)  | ​                                              | ​ | ​ | ​                               | ​ | 2,138   | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (2,123) | ​ | ​ | ​ | ​ | ​ | 237,476 | ​ | ​ | ​ | ​ | ​ | 18,126 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Ridgeback Resources Inc.                                      | ​ | ​ | ​                              | ​ | 3,887   | ​                                           | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | (3,887)  | ​                                              | ​ | ​ | ​                               | ​ | 6       | ​            | ​ | ​ | ​       | ​ | 56      | ​       | ​ | ​ | ​ | ​ | (62) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 297 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Sunnova Energy Corp.                                          | ​ | ​ | ​                              | ​ | — | ​                                           | ​ | ​ | ​                             | ​ | 35,078  | ​               | ​ | ​ | ​                  | ​ | (8,672)  | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (33) | ​ | ​ | ​ | ​ | ​ | 26,373 | ​ | ​ | ​ | ​ | ​ | 2,596 | ​ | ​ | ​ | ​ | ​ | 1,407 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Equity/Other                                                  | ​ | ​ | ​                              | ​ | ​ | ​                                           | ​ | ​ | ​                             | ​ | ​ | ​               | ​ | ​ | ​                  | ​ | ​  | ​                                              | ​ | ​ | ​                               | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​       | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Altus Power America Holdings, LLC, Common Equity              | ​ | ​ | ​                              | ​ | 1,871   | ​                                           | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —  | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 1,871 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Altus Power America Holdings, LLC, Preferred Equity           | ​ | ​ | ​                              | ​ | 25,793  | ​                                           | ​ | ​ | ​                             | ​ | 6,036   | ​               | ​ | ​ | ​                  | ​ | (3,841)  | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (980) | ​ | ​ | ​ | ​ | ​ | 27,008 | ​ | ​ | ​ | ​ | ​ | 2,775 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| BL Sand Hills Unit, L.P., Net Profits Interest                | ​ | ​ | ​                              | ​ | 966     | ​                                           | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —  | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | 111 | ​ | ​ | ​ | ​ | ​ | 1,077 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| BL Sand Hills Unit, L.P., Overriding Royalty Interest         | ​ | ​ | ​                              | ​ | 726     | ​                                           | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —  | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | 15 | ​ | ​ | ​ | ​ | ​ | 741 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| BL Sand Hills Unit, L.P., Series A Units                 | ​ | ​ | ​                              | ​ | 7,000   | ​                                           | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —  | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (2,160) | ​ | ​ | ​ | ​ | ​ | 4,840 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| FourPoint Energy, LLC, Common Equity, Class C-II-A Units | ​ | ​ | ​                              | ​ | 19,140  | ​                                           | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —  | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (495) | ​ | ​ | ​ | ​ | ​ | 18,645 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| FourPoint Energy, LLC, Common Equity, Class D Units      | ​ | ​ | ​                              | ​ | 3,619   | ​                                           | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —  | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (92) | ​ | ​ | ​ | ​ | ​ | 3,527 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| FourPoint Energy, LLC, Common Equity, Class E-II Units   | ​ | ​ | ​                              | ​ | 43,395  | ​                                           | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —  | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (944) | ​ | ​ | ​ | ​ | ​ | 42,451 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| FourPoint Energy, LLC, Common Equity, Class E-III Units  | ​ | ​ | ​                              | ​ | 64,598  | ​                                           | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —  | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (1,671) | ​ | ​ | ​ | ​ | ​ | 62,927 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Harvest Oil & Gas Corp., Common Equity                    | ​ | ​ | ​                              | ​ | — | ​                                           | ​ | ​ | ​                             | ​ | 29,714  | ​               | ​ | ​ | ​                  | ​ | —  | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (2,702) | ​ | ​ | ​ | ​ | ​ | 27,012 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Ridgeback Resources Inc., Common Equity                       | ​ | ​ | ​                              | ​ | 58,284  | ​                                           | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —  | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | 8,013 | ​ | ​ | ​ | ​ | ​ | 66,297 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Sunnova Energy Corp., Common Equity                           | ​ | ​ | ​                              | ​ | — | ​                                           | ​ | ​ | ​                             | ​ | 25,026  | ​               | ​ | ​ | ​                  | ​ | —  | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (25,026) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Sunnova Energy Corp., Preferred Equity                        | ​ | ​ | ​                              | ​ | — | ​                                           | ​ | ​ | ​                             | ​ | 5,948   | ​               | ​ | ​ | ​                  | ​ | —  | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | 509 | ​ | ​ | ​ | ​ | ​ | 6,457 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Titan Energy, LLC, Common Equity                              | ​ | ​ | ​                              | ​ | 844     | ​                                           | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —  | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (616) | ​ | ​ | ​ | ​ | ​ | 228 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Warren Resources, Inc., Common Equity                         | ​ | ​ | ​                              | ​ | 7,507   | ​                                           | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —  | ​                                              | ​ | ​ | ​                               | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | 9,273 | ​ | ​ | ​ | ​ | ​ | 16,780 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Total                                                         | ​ | ​ | ​                              | $       | 715,169 | ​                                           | ​ | ​ | ​                             | $       | 108,649 | ​               | ​ | ​ | ​                  | $       | (70,150) | ​                                              | ​ | ​ | ​                               | $       | 2,176   | ​            | ​ | ​ | ​       | $       | 56      | ​       | ​ | ​ | ​ | $ | (63,732) | ​ | ​ | ​ | ​ | $ | 692,168 | ​ | ​ | ​ | ​ | $ | 35,064 | ​ | ​ | ​ | ​ | $ | 1,669 | ​ | ​ | ​ | ​ | $ | 2,091 | ​ | ​ |
| ​                                                       |

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TABLE OF CONTENTS

| Portfolio Company                     | ​ | ​ | Fair Value at December 31, 2017 | ​ | ​                   | Purchases, Paid-in-Kind Interest and Other | ​ | ​ | Sales, Repayments and Other | ​ | ​                   | Accretion of Discount | ​ | ​ | Net Realized Gain (Loss) | ​ | ​                   | Net Change in Unrealized Appreciation (Depreciation) | ​ | ​ | Fair Value at September 30, 2018 | ​ |
|---------------------------------------|---------|---------|--------------------------------------|---------|---------------------------|--------------------------------------------|---------|---------|-----------------------------|---------|---------------------------|-----------------------|---------|---------|--------------------------|---------|---------------------------|------------------------------------------------------|---------|---------|---------------------------------------|---------|
| Senior Secured Loans—First Lien | ​ | ​ | ​                              | ​ | ​                   | ​                                    | ​ | ​ | ​                     | ​ | ​                   | ​               | ​ | ​ | ​                  | ​ | ​                   | ​                                              | ​ | ​ | ​                               | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Lusk Operating LLC                    | ​ | ​ | ​                              | $       |    — | ​                                    | ​ | ​ | ​                     | $       |    — | ​               | ​ | ​ | ​                  | $       |    — | ​                                              | ​ | ​ | ​                               | $       |    — | ​ | ​ | ​ | ​ | $ |    — | ​ | ​ | ​ | ​ | $ |    — | ​ | ​ | ​ | ​ | $ |    — | ​ | ​ |
| Equity/Other                          | ​ | ​ | ​                              | ​ | ​                   | ​                                    | ​ | ​ | ​                     | ​ | ​                   | ​               | ​ | ​ | ​                  | ​ | ​                   | ​                                              | ​ | ​ | ​                               | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Lusk Operating LLC, Common Equity     | ​ | ​ | ​                              | ​ | —                   | ​                                    | ​ | ​ | ​                     | ​ | —                   | ​               | ​ | ​ | ​                  | ​ | —                   | ​                                              | ​ | ​ | ​                               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Total                                 | ​ | ​ | ​                              | $       | —                   | ​                                    | ​ | ​ | ​                     | $       | —                   | ​               | ​ | ​ | ​                  | $       | —                   | ​                                              | ​ | ​ | ​                               | $       | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ |
| ​                               |

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TABLE OF CONTENTS

| Portfolio Company(a)                              | ​ | ​ | Footnotes  | ​ | ​ | Industry                | ​ | ​ | Rate(b)                          | ​ | ​ | Floor   | ​ | ​ | Maturity | ​ | ​ | Principal Amount(c) | ​ | ​ | AmortizedCost | ​ | ​ | Fair Value(d) | ​ |
|---------------------------------------------------|---------|---------|------------|---------|---------|-------------------------|---------|---------|----------------------------------|---------|---------|---------|---------|---------|----------|---------|---------|---------------------|---------|---------|---------------|---------|---------|---------------|---------|
| Senior Secured Loans—First Lien—31.2% | ​ | ​ | ​    | ​ | ​ | ​                 | ​ | ​ | ​                          | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​             | ​ | ​ | ​       | ​ | ​ | ​       | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Abaco Energy Technologies LLC                     | ​ | ​ | (g)(j)     | ​ | ​ | Service & Equipment | ​ | ​ | L+700, 2.5% PIK (2.5% Max PIK)   | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 11/20/20            | ​ | ​ | ​       | $       | 86,207  | ​       | ​ | ​ | ​ | $ | 82,722 | ​ | ​ | ​ | ​ | $ | 84,697 | ​ | ​ |
| Allied Wireline Services, LLC                     | ​ | ​ | (k)(l)     | ​ | ​ | Service & Equipment | ​ | ​ | L+400, 5.5% PIK (5.5% Max PIK)   | ​ | ​ | ​ | ​ | 1.5%    | ​  | ​ | ​ | 2/28/19             | ​ | ​ | ​       | ​ | 115,104 | ​       | ​ | ​ | ​ | ​ | 114,625 | ​ | ​ | ​ | ​ | ​ | 113,377 | ​ | ​ |
| Altus Power America, Inc.                         | ​ | ​ | (j)(aa)    | ​ | ​ | Power                   | ​ | ​ | L+750                            | ​ | ​ | ​ | ​ | 1.5%    | ​  | ​ | ​ | 9/30/21             | ​ | ​ | ​       | ​ | 77,378  | ​       | ​ | ​ | ​ | ​ | 77,378 | ​ | ​ | ​ | ​ | ​ | 75,830 | ​ | ​ |
| Altus Power America, Inc.                         | ​ | ​ | (e)(aa)    | ​ | ​ | Power                   | ​ | ​ | L+750                            | ​ | ​ | ​ | ​ | 1.5%    | ​  | ​ | ​ | 9/30/21             | ​ | ​ | ​       | ​ | 23,872  | ​       | ​ | ​ | ​ | ​ | 23,872 | ​ | ​ | ​ | ​ | ​ | 23,395 | ​ | ​ |
| BL Sand Hills Unit, L.P.                          | ​ | ​ | (l)(aa)    | ​ | ​ | Upstream                | ​ | ​ | Prime+650                        | ​ | ​ | ​ | ​ | 3.5%    | ​  | ​ | ​ | 12/17/21            | ​ | ​ | ​       | ​ | 20,000  | ​       | ​ | ​ | ​ | ​ | 17,369 | ​ | ​ | ​ | ​ | ​ | 20,000 | ​ | ​ |
| Cactus Wellhead, LLC                              | ​ | ​ | (f)(j)     | ​ | ​ | Service & Equipment | ​ | ​ | L+600                            | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 7/31/20             | ​ | ​ | ​       | ​ | 41,225  | ​       | ​ | ​ | ​ | ​ | 39,865 | ​ | ​ | ​ | ​ | ​ | 41,293 | ​ | ​ |
| Cimarron Energy Inc.                              | ​ | ​ | ​    | ​ | ​ | Service & Equipment | ​ | ​ | L+1150 PIK (L+1150 Max PIK)      | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 12/15/19            | ​ | ​ | ​       | ​ | 25,470  | ​       | ​ | ​ | ​ | ​ | 25,470 | ​ | ​ | ​ | ​ | ​ | 10,379 | ​ | ​ |
| CITGO Holding, Inc.                               | ​ | ​ | (f)        | ​ | ​ | Downstream              | ​ | ​ | L+850                            | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 5/12/18             | ​ | ​ | ​       | ​ | 26,014  | ​       | ​ | ​ | ​ | ​ | 26,149 | ​ | ​ | ​ | ​ | ​ | 26,340 | ​ | ​ |
| Crestwood Holdings LLC                            | ​ | ​ | (f)        | ​ | ​ | Midstream               | ​ | ​ | L+800                            | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 6/19/19             | ​ | ​ | ​       | ​ | 29,151  | ​       | ​ | ​ | ​ | ​ | 29,210 | ​ | ​ | ​ | ​ | ​ | 29,297 | ​ | ​ |
| Eagle Midstream Canada Finance Inc.               | ​ | ​ | (l)(m)     | ​ | ​ | Midstream               | ​ | ​ | 8.5%                             | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 9/27/20             | ​ | ​ | ​       | ​ | 175,000 | ​       | ​ | ​ | ​ | ​ | 175,000 | ​ | ​ | ​ | ​ | ​ | 175,000 | ​ | ​ |
| Gulf Finance, LLC                                 | ​ | ​ | (f)        | ​ | ​ | Midstream               | ​ | ​ | L+525                            | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 8/25/23             | ​ | ​ | ​       | ​ | 18,485  | ​       | ​ | ​ | ​ | ​ | 18,030 | ​ | ​ | ​ | ​ | ​ | 16,687 | ​ | ​ |
| Industrial Group Intermediate Holdings, LLC       | ​ | ​ | ​    | ​ | ​ | Service & Equipment | ​ | ​ | L+800                            | ​ | ​ | ​ | ​ | 1.3%    | ​  | ​ | ​ | 5/31/20             | ​ | ​ | ​       | ​ | 23,027  | ​       | ​ | ​ | ​ | ​ | 23,027 | ​ | ​ | ​ | ​ | ​ | 23,373 | ​ | ​ |
| JSS Holdings, Inc.                                | ​ | ​ | (l)        | ​ | ​ | Service & Equipment | ​ | ​ | L+800, 0.0% PIK (2.5% Max PIK)   | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 3/31/23             | ​ | ​ | ​       | ​ | 14,941  | ​       | ​ | ​ | ​ | ​ | 14,809 | ​ | ​ | ​ | ​ | ​ | 15,173 | ​ | ​ |
| JSS Holdings, Inc.                                | ​ | ​ | (e)        | ​ | ​ | Service & Equipment | ​ | ​ | L+800, 0.0% PIK (2.5% Max PIK)   | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 3/31/23             | ​ | ​ | ​       | ​ | 2,727   | ​       | ​ | ​ | ​ | ​ | 2,727 | ​ | ​ | ​ | ​ | ​ | 2,770 | ​ | ​ |
| Kraken Oil & Gas LLC                          | ​ | ​ | ​    | ​ | ​ | Upstream                | ​ | ​ | L+750                            | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 5/7/21              | ​ | ​ | ​       | ​ | 35,000  | ​       | ​ | ​ | ​ | ​ | 34,660 | ​ | ​ | ​ | ​ | ​ | 34,913 | ​ | ​ |
| Kraken Oil & Gas LLC                          | ​ | ​ | (e)        | ​ | ​ | Upstream                | ​ | ​ | L+750                            | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 5/7/21              | ​ | ​ | ​       | ​ | 25,000  | ​       | ​ | ​ | ​ | ​ | 25,000 | ​ | ​ | ​ | ​ | ​ | 24,938 | ​ | ​ |
| Lusk Operating LLC                                | ​ | ​ | (p)(r)(bb) | ​ | ​ | Upstream                | ​ | ​ | Prime+500 PIK (8.8% Max PIK)     | ​ | ​ | ​ | ​ | 3.3%    | ​  | ​ | ​ | 1/31/18             | ​ | ​ | ​       | ​ | 29,297  | ​       | ​ | ​ | ​ | ​ | 27,464 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| MB Precision Holdings LLC                         | ​ | ​ | ​    | ​ | ​ | Service & Equipment | ​ | ​ | L+725, 2.25% PIK (2.25% Max PIK) | ​ | ​ | ​ | ​ | 1.3%    | ​  | ​ | ​ | 1/23/21             | ​ | ​ | ​       | ​ | 13,793  | ​       | ​ | ​ | ​ | ​ | 13,793 | ​ | ​ | ​ | ​ | ​ | 12,638 | ​ | ​ |
| Panda Temple Power, LLC                           | ​ | ​ | (j)(p)(r)  | ​ | ​ | Power                   | ​ | ​ | L+625                            | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 3/6/22              | ​ | ​ | ​       | ​ | 9,923   | ​       | ​ | ​ | ​ | ​ | 9,782 | ​ | ​ | ​ | ​ | ​ | 7,219 | ​ | ​ |
| Panda Temple Power, LLC                           | ​ | ​ | ​    | ​ | ​ | Power                   | ​ | ​ | L+900                            | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 4/28/18             | ​ | ​ | ​       | ​ | 377     | ​       | ​ | ​ | ​ | ​ | 377 | ​ | ​ | ​ | ​ | ​ | 378 | ​ | ​ |
| Power Distribution, Inc.                          | ​ | ​ | ​    | ​ | ​ | Power                   | ​ | ​ | L+725                            | ​ | ​ | ​ | ​ | 1.3%    | ​  | ​ | ​ | 1/25/23             | ​ | ​ | ​       | ​ | 29,928  | ​       | ​ | ​ | ​ | ​ | 29,928 | ​ | ​ | ​ | ​ | ​ | 30,377 | ​ | ​ |
| Strike, LLC                                       | ​ | ​ | (j)        | ​ | ​ | Midstream               | ​ | ​ | L+800                            | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 5/30/19             | ​ | ​ | ​       | ​ | 19,600  | ​       | ​ | ​ | ​ | ​ | 19,358 | ​ | ​ | ​ | ​ | ​ | 19,698 | ​ | ​ |
| Strike, LLC                                       | ​ | ​ | (j)        | ​ | ​ | Midstream               | ​ | ​ | L+800                            | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 11/30/22            | ​ | ​ | ​       | ​ | 23,750  | ​       | ​ | ​ | ​ | ​ | 23,160 | ​ | ​ | ​ | ​ | ​ | 24,106 | ​ | ​ |
| Swift Worldwide Resources US Holdings Corp.       | ​ | ​ | (j)        | ​ | ​ | Service & Equipment | ​ | ​ | L+1000, 1.0% PIK (1.0% Max PIK)  | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 7/20/21             | ​ | ​ | ​       | ​ | 58,468  | ​       | ​ | ​ | ​ | ​ | 58,468 | ​ | ​ | ​ | ​ | ​ | 59,637 | ​ | ​ |
| UTEX Industries, Inc.                             | ​ | ​ | (f)        | ​ | ​ | Service & Equipment | ​ | ​ | L+400                            | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 5/21/21             | ​ | ​ | ​       | ​ | 24,210  | ​       | ​ | ​ | ​ | ​ | 22,006 | ​ | ​ | ​ | ​ | ​ | 23,796 | ​ | ​ |
| Warren Resources, Inc.                            | ​ | ​ | (j)(l)(aa) | ​ | ​ | Upstream                | ​ | ​ | L+900, 1.0% PIK (1.0% Max PIK)   | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 5/22/20             | ​ | ​ | ​       | ​ | 79,233  | ​       | ​ | ​ | ​ | ​ | 79,233 | ​ | ​ | ​ | ​ | ​ | 81,214 | ​ | ​ |
| Total Senior Secured Loans—First Lien       | ​ | ​ | ​    | ​ | ​ | ​                 | ​ | ​ | ​                          | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​             | ​ | ​ | ​       | ​ | ​ | ​       | ​ | ​ | ​ | ​ | 1,013,482 | ​ | ​ | ​ | ​ | ​ | 976,525 | ​ | ​ |
| Unfunded Loan Commitments                         | ​ | ​ | ​    | ​ | ​ | ​                 | ​ | ​ | ​                          | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​             | ​ | ​ | ​       | ​ | ​ | ​       | ​ | ​ | ​ | ​ | (51,599) | ​ | ​ | ​ | ​ | ​ | (51,599) | ​ | ​ |
| Net Senior Secured Loans—First Lien         | ​ | ​ | ​    | ​ | ​ | ​                 | ​ | ​ | ​                          | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​             | ​ | ​ | ​       | ​ | ​ | ​       | ​ | ​ | ​ | ​ | 961,883 | ​ | ​ | ​ | ​ | ​ | 924,926 | ​ | ​ |
| ​                                           |

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TABLE OF CONTENTS

| Portfolio Company(a)                               | ​ | ​ | Footnotes     | ​ | ​ | Industry                | ​ | ​ | Rate(b)                           | ​ | ​ | Floor   | ​ | ​ | Maturity | ​ | ​ | PrincipalAmount(c) | ​ | ​ | AmortizedCost | ​ | ​ | FairValue(d) | ​ |
|----------------------------------------------------|---------|---------|---------------|---------|---------|-------------------------|---------|---------|-----------------------------------|---------|---------|---------|---------|---------|----------|---------|---------|--------------------|---------|---------|---------------|---------|---------|--------------|---------|
| Senior Secured Loans—Second Lien—26.8% | ​ | ​ | ​       | ​ | ​ | ​                 | ​ | ​ | ​                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​      | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Aethon United BR LP                                | ​ | ​ | ​       | ​ | ​ | Upstream                | ​ | ​ | L+675                             | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 9/8/23             | ​ | ​ | ​       | $       | 85,938  | ​      | ​ | ​ | ​ | $ | 84,698 | ​ | ​ | ​ | ​ | $ | 85,052 | ​ | ​ |
| Aethon United BR LP                                | ​ | ​ | (e)           | ​ | ​ | Upstream                | ​ | ​ | L+675                             | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 9/8/23             | ​ | ​ | ​       | ​ | 39,063  | ​      | ​ | ​ | ​ | ​ | 39,063 | ​ | ​ | ​ | ​ | ​ | 38,660 | ​ | ​ |
| Arena Energy, LP                                   | ​ | ​ | (j)(k)        | ​ | ​ | Upstream                | ​ | ​ | L+900, 4.0% PIK (4.0% Max PIK)    | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 1/24/21            | ​ | ​ | ​       | ​ | 107,656 | ​      | ​ | ​ | ​ | ​ | 107,656 | ​ | ​ | ​ | ​ | ​ | 102,360 | ​ | ​ |
| Chief Exploration & Development LLC            | ​ | ​ | (f)           | ​ | ​ | Upstream                | ​ | ​ | L+650                             | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 5/16/21            | ​ | ​ | ​       | ​ | 16,156  | ​      | ​ | ​ | ​ | ​ | 15,685 | ​ | ​ | ​ | ​ | ​ | 15,928 | ​ | ​ |
| Chisholm Oil and Gas Operating, LLC                | ​ | ​ | (j)(k)(l)     | ​ | ​ | Upstream                | ​ | ​ | L+800                             | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 3/21/24            | ​ | ​ | ​       | ​ | 196,000 | ​      | ​ | ​ | ​ | ​ | 196,000 | ​ | ​ | ​ | ​ | ​ | 195,971 | ​ | ​ |
| Emerald Performance Materials, LLC                 | ​ | ​ | (f)           | ​ | ​ | Downstream              | ​ | ​ | L+775                             | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 8/1/22             | ​ | ​ | ​       | ​ | 11,819  | ​      | ​ | ​ | ​ | ​ | 11,764 | ​ | ​ | ​ | ​ | ​ | 11,838 | ​ | ​ |
| Fieldwood Energy LLC                               | ​ | ​ | (f)(p)(r)     | ​ | ​ | Upstream                | ​ | ​ | L+713                             | ​ | ​ | ​ | ​ | 1.3%    | ​  | ​ | ​ | 9/30/20            | ​ | ​ | ​       | ​ | 33,591  | ​      | ​ | ​ | ​ | ​ | 34,068 | ​ | ​ | ​ | ​ | ​ | 11,252 | ​ | ​ |
| Granite Acquisition, Inc.                          | ​ | ​ | (f)           | ​ | ​ | Power                   | ​ | ​ | L+725                             | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 12/19/22           | ​ | ​ | ​       | ​ | 18,694  | ​      | ​ | ​ | ​ | ​ | 18,330 | ​ | ​ | ​ | ​ | ​ | 18,825 | ​ | ​ |
| Gruden Acquisition, Inc.                           | ​ | ​ | (j)           | ​ | ​ | Service & Equipment | ​ | ​ | L+850                             | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 8/18/23            | ​ | ​ | ​       | ​ | 15,000  | ​      | ​ | ​ | ​ | ​ | 14,463 | ​ | ​ | ​ | ​ | ​ | 14,981 | ​ | ​ |
| Horn Intermediate Holdings, Inc.                   | ​ | ​ | (j)           | ​ | ​ | Service & Equipment | ​ | ​ | L+775                             | ​ | ​ | ​ | ​ | 1.3%    | ​  | ​ | ​ | 10/2/18            | ​ | ​ | ​       | ​ | 50,250  | ​      | ​ | ​ | ​ | ​ | 50,250 | ​ | ​ | ​ | ​ | ​ | 50,501 | ​ | ​ |
| P2 Upstream Acquisition Co.                        | ​ | ​ | (f)(j)        | ​ | ​ | Service & Equipment | ​ | ​ | L+800                             | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 4/30/21            | ​ | ​ | ​       | ​ | 42,399  | ​      | ​ | ​ | ​ | ​ | 42,046 | ​ | ​ | ​ | ​ | ​ | 39,218 | ​ | ​ |
| Penn Virginia Holding Corp.                        | ​ | ​ | (m)           | ​ | ​ | Upstream                | ​ | ​ | L+700                             | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 9/29/22            | ​ | ​ | ​       | ​ | 50,000  | ​      | ​ | ​ | ​ | ​ | 50,000 | ​ | ​ | ​ | ​ | ​ | 50,053 | ​ | ​ |
| SilverBow Resources, Inc.                          | ​ | ​ | (m)           | ​ | ​ | Upstream                | ​ | ​ | L+750                             | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 12/15/24           | ​ | ​ | ​       | ​ | 15,000  | ​      | ​ | ​ | ​ | ​ | 14,850 | ​ | ​ | ​ | ​ | ​ | 14,850 | ​ | ​ |
| Talos Production LLC                               | ​ | ​ | (k)(l)        | ​ | ​ | Upstream                | ​ | ​ | 11.0%                             | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 4/3/22             | ​ | ​ | ​       | ​ | 43,250  | ​      | ​ | ​ | ​ | ​ | 40,495 | ​ | ​ | ​ | ​ | ​ | 42,926 | ​ | ​ |
| Titan Energy Operating, LLC                        | ​ | ​ | (k)(aa)       | ​ | ​ | Upstream                | ​ | ​ | 2.0%, L+1100 PIK (L+1100 Max PIK) | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 2/23/20            | ​ | ​ | ​       | ​ | 116,964 | ​      | ​ | ​ | ​ | ​ | 100,902 | ​ | ​ | ​ | ​ | ​ | 62,026 | ​ | ​ |
| UTEX Industries, Inc.                              | ​ | ​ | (f)(j)        | ​ | ​ | Service & Equipment | ​ | ​ | L+725                             | ​ | ​ | ​ | ​ | 1.0%    | ​  | ​ | ​ | 5/20/22            | ​ | ​ | ​       | ​ | 85,192  | ​      | ​ | ​ | ​ | ​ | 79,263 | ​ | ​ | ​ | ​ | ​ | 81,146 | ​ | ​ |
| Total Senior Secured Loans—Second Lien       | ​ | ​ | ​       | ​ | ​ | ​                 | ​ | ​ | ​                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​      | ​ | ​ | ​ | ​ | 899,533 | ​ | ​ | ​ | ​ | ​ | 835,587 | ​ | ​ |
| Unfunded Loan Commitment                           | ​ | ​ | ​       | ​ | ​ | ​                 | ​ | ​ | ​                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​      | ​ | ​ | ​ | ​ | (39,063) | ​ | ​ | ​ | ​ | ​ | (39,063) | ​ | ​ |
| Net Senior Secured Loans—Second Lien         | ​ | ​ | ​       | ​ | ​ | ​                 | ​ | ​ | ​                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​      | ​ | ​ | ​ | ​ | 860,470 | ​ | ​ | ​ | ​ | ​ | 796,524 | ​ | ​ |
| Senior Secured Bonds—22.3%                   | ​ | ​ | ​       | ​ | ​ | ​                 | ​ | ​ | ​                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​      | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Black Swan Energy Ltd.                             | ​ | ​ | (j)(m)        | ​ | ​ | Upstream                | ​ | ​ | 9.0%                              | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 1/20/24            | ​ | ​ | ​       | ​ | 90,000  | ​      | ​ | ​ | ​ | ​ | 90,000 | ​ | ​ | ​ | ​ | ​ | 90,675 | ​ | ​ |
| CITGO Holding, Inc.                                | ​ | ​ | (f)           | ​ | ​ | Downstream              | ​ | ​ | 10.8%                             | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 2/15/20            | ​ | ​ | ​       | ​ | 9,000   | ​      | ​ | ​ | ​ | ​ | 9,045 | ​ | ​ | ​ | ​ | ​ | 9,653 | ​ | ​ |
| CSVC Acquisition Corp.                             | ​ | ​ | (f)           | ​ | ​ | Service & Equipment | ​ | ​ | 7.8%                              | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 6/15/25            | ​ | ​ | ​       | ​ | 30,608  | ​      | ​ | ​ | ​ | ​ | 30,608 | ​ | ​ | ​ | ​ | ​ | 29,460 | ​ | ​ |
| EP Energy LLC                                      | ​ | ​ | (f)(h)(m)(o)  | ​ | ​ | Upstream                | ​ | ​ | 8.0%                              | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 2/15/25            | ​ | ​ | ​       | ​ | 54,880  | ​      | ​ | ​ | ​ | ​ | 52,838 | ​ | ​ | ​ | ​ | ​ | 40,131 | ​ | ​ |
| EP Energy LLC                                      | ​ | ​ | (g)(h)(m)     | ​ | ​ | Upstream                | ​ | ​ | 9.4%                              | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 5/1/24             | ​ | ​ | ​       | ​ | 68,614  | ​      | ​ | ​ | ​ | ​ | 63,012 | ​ | ​ | ​ | ​ | ​ | 60,134 | ​ | ​ |
| FourPoint Energy, LLC                              | ​ | ​ | (j)(k)(l)(aa) | ​ | ​ | Upstream                | ​ | ​ | 9.0%                              | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 12/31/21           | ​ | ​ | ​       | ​ | 235,125 | ​      | ​ | ​ | ​ | ​ | 227,815 | ​ | ​ | ​ | ​ | ​ | 238,946 | ​ | ​ |
| Mirant Mid-Atlantic Trust                          | ​ | ​ | (f)(h)(o)     | ​ | ​ | Power                   | ​ | ​ | 10.1%                             | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 12/30/28           | ​ | ​ | ​       | ​ | 31,752  | ​      | ​ | ​ | ​ | ​ | 33,728 | ​ | ​ | ​ | ​ | ​ | 32,052 | ​ | ​ |
| Ridgeback Resources Inc.                           | ​ | ​ | (k)(m)(aa)    | ​ | ​ | Upstream                | ​ | ​ | 12.0%                             | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 12/29/20           | ​ | ​ | ​       | ​ | 3,887   | ​      | ​ | ​ | ​ | ​ | 3,825 | ​ | ​ | ​ | ​ | ​ | 3,887 | ​ | ​ |
| Sunnova Energy Corp.                               | ​ | ​ | (j)           | ​ | ​ | Power                   | ​ | ​ | 6.0%, 6.0% PIK (6.0% Max PIK)     | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 10/24/18           | ​ | ​ | ​       | ​ | 33,671  | ​      | ​ | ​ | ​ | ​ | 33,671 | ​ | ​ | ​ | ​ | ​ | 33,671 | ​ | ​ |
| Velvet Energy Ltd.                                 | ​ | ​ | (j)(l)(m)     | ​ | ​ | Upstream                | ​ | ​ | 9.0%                              | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 10/5/23            | ​ | ​ | ​       | ​ | 120,000 | ​      | ​ | ​ | ​ | ​ | 120,000 | ​ | ​ | ​ | ​ | ​ | 121,542 | ​ | ​ |
| Total Senior Secured Bonds                         | ​ | ​ | ​       | ​ | ​ | ​                 | ​ | ​ | ​                           | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​      | ​ | ​ | ​ | ​ | 664,542 | ​ | ​ | ​ | ​ | ​ | 660,151 | ​ | ​ |
| ​                                            |

----

TABLE OF CONTENTS

| Portfolio Company(a)                             | ​ | ​ | Footnotes       | ​ | ​ | Industry                | ​ | ​ | Rate(b)                   | ​ | ​ | Floor   | ​ | ​ | Maturity | ​ | ​ | PrincipalAmount(c) | ​ | ​ | AmortizedCost | ​ | ​ | FairValue(d) |
|--------------------------------------------------|---------|---------|-----------------|---------|---------|-------------------------|---------|---------|---------------------------|---------|---------|---------|---------|---------|----------|---------|---------|--------------------|---------|---------|---------------|---------|---------|--------------|
| Subordinated Debt—40.6%                    | ​ | ​ | ​         | ​ | ​ | ​                 | ​ | ​ | ​                   | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​      | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Alta Mesa Holdings, LP                           | ​ | ​ | (f)(h)          | ​ | ​ | Upstream                | ​ | ​ | 7.9%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 12/15/24           | ​ | ​ | ​       | $       | 20,425  | ​      | ​ | ​ | ​ | $ | 20,425 | ​ | ​ | ​ | ​ | $ | 22,459 |
| Archrock Partners, L.P.                          | ​ | ​ | (h)(m)(o)       | ​ | ​ | Midstream               | ​ | ​ | 6.0%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 4/1/21             | ​ | ​ | ​       | ​ | 8,555   | ​      | ​ | ​ | ​ | ​ | 7,714 | ​ | ​ | ​ | ​ | ​ | 8,587 |
| Archrock Partners, L.P.                          | ​ | ​ | (h)(m)          | ​ | ​ | Midstream               | ​ | ​ | 6.0%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 10/1/22            | ​ | ​ | ​       | ​ | 14,283  | ​      | ​ | ​ | ​ | ​ | 12,661 | ​ | ​ | ​ | ​ | ​ | 14,337 |
| Ascent Resources Utica Holdings, LLC             | ​ | ​ | (f)(h)(j)(o)    | ​ | ​ | Upstream                | ​ | ​ | 10.0%                     | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 4/1/22             | ​ | ​ | ​       | ​ | 200,000 | ​      | ​ | ​ | ​ | ​ | 200,000 | ​ | ​ | ​ | ​ | ​ | 216,132 |
| Bellatrix Exploration Ltd.                       | ​ | ​ | (f)(h)(m)(o)    | ​ | ​ | Upstream                | ​ | ​ | 8.5%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 5/15/20            | ​ | ​ | ​       | ​ | 60,120  | ​      | ​ | ​ | ​ | ​ | 59,240 | ​ | ​ | ​ | ​ | ​ | 57,415 |
| Brand Energy & Infrastructure Services, Inc. | ​ | ​ | (f)(h)          | ​ | ​ | Service & Equipment | ​ | ​ | 8.5%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 7/15/25            | ​ | ​ | ​       | ​ | 44,759  | ​      | ​ | ​ | ​ | ​ | 44,759 | ​ | ​ | ​ | ​ | ​ | 47,165 |
| Canbriam Energy Inc.                             | ​ | ​ | (f)(h)(j)(m)(o) | ​ | ​ | Upstream                | ​ | ​ | 9.8%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 11/15/19           | ​ | ​ | ​       | ​ | 115,200 | ​      | ​ | ​ | ​ | ​ | 113,222 | ​ | ​ | ​ | ​ | ​ | 117,648 |
| Compressco Partners, LP                          | ​ | ​ | (f)(h)(o)       | ​ | ​ | Service & Equipment | ​ | ​ | 7.3%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 8/15/22            | ​ | ​ | ​       | ​ | 20,050  | ​      | ​ | ​ | ​ | ​ | 19,929 | ​ | ​ | ​ | ​ | ​ | 18,972 |
| Covey Park Energy LLC                            | ​ | ​ | (h)(o)          | ​ | ​ | Upstream                | ​ | ​ | 7.5%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 5/15/25            | ​ | ​ | ​       | ​ | 8,333   | ​      | ​ | ​ | ​ | ​ | 8,333 | ​ | ​ | ​ | ​ | ​ | 8,705 |
| Eclipse Resources Corp.                          | ​ | ​ | (f)(h)(m)(o)    | ​ | ​ | Upstream                | ​ | ​ | 8.9%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 7/15/23            | ​ | ​ | ​       | ​ | 62,745  | ​      | ​ | ​ | ​ | ​ | 57,444 | ​ | ​ | ​ | ​ | ​ | 64,549 |
| EV Energy Partners, L.P.                         | ​ | ​ | (f)(h)(o)(p)    | ​ | ​ | Upstream                | ​ | ​ | 8.0%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 4/15/19            | ​ | ​ | ​       | ​ | 48,814  | ​      | ​ | ​ | ​ | ​ | 39,678 | ​ | ​ | ​ | ​ | ​ | 24,895 |
| Extraction Oil & Gas Holdings, LLC           | ​ | ​ | (h)(o)          | ​ | ​ | Upstream                | ​ | ​ | 7.9%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 7/15/21            | ​ | ​ | ​       | ​ | 37,500  | ​      | ​ | ​ | ​ | ​ | 37,500 | ​ | ​ | ​ | ​ | ​ | 39,777 |
| Genesis Energy, L.P.                             | ​ | ​ | (f)(m)          | ​ | ​ | Midstream               | ​ | ​ | 6.8%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 8/1/22             | ​ | ​ | ​       | ​ | 23,540  | ​      | ​ | ​ | ​ | ​ | 23,036 | ​ | ​ | ​ | ​ | ​ | 24,477 |
| Genesis Energy, L.P.                             | ​ | ​ | (f)(m)          | ​ | ​ | Midstream               | ​ | ​ | 6.0%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 5/15/23            | ​ | ​ | ​       | ​ | 15,280  | ​      | ​ | ​ | ​ | ​ | 14,264 | ​ | ​ | ​ | ​ | ​ | 15,519 |
| Global Jet Capital Inc.                          | ​ | ​ | ​         | ​ | ​ | Service & Equipment | ​ | ​ | 15.0% PIK (15.0% Max PIK) | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 1/30/25            | ​ | ​ | ​       | ​ | 849     | ​      | ​ | ​ | ​ | ​ | 849 | ​ | ​ | ​ | ​ | ​ | 864 |
| Global Jet Capital Inc.                          | ​ | ​ | ​         | ​ | ​ | Service & Equipment | ​ | ​ | 15.0% PIK (15.0% Max PIK) | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 4/30/25            | ​ | ​ | ​       | ​ | 5,398   | ​      | ​ | ​ | ​ | ​ | 5,398 | ​ | ​ | ​ | ​ | ​ | 5,492 |
| Global Jet Capital Inc.                          | ​ | ​ | ​         | ​ | ​ | Service & Equipment | ​ | ​ | 15.0% PIK (15.0% Max PIK) | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 9/3/25             | ​ | ​ | ​       | ​ | 1,115   | ​      | ​ | ​ | ​ | ​ | 1,115 | ​ | ​ | ​ | ​ | ​ | 1,135 |
| Global Jet Capital Inc.                          | ​ | ​ | ​         | ​ | ​ | Service & Equipment | ​ | ​ | 15.0% PIK (15.0% Max PIK) | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 9/29/25            | ​ | ​ | ​       | ​ | 1,050   | ​      | ​ | ​ | ​ | ​ | 1,050 | ​ | ​ | ​ | ​ | ​ | 1,068 |
| Global Jet Capital Inc.                          | ​ | ​ | ​         | ​ | ​ | Service & Equipment | ​ | ​ | 15.0% PIK (15.0% Max PIK) | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 12/2/26            | ​ | ​ | ​       | ​ | 923     | ​      | ​ | ​ | ​ | ​ | 923 | ​ | ​ | ​ | ​ | ​ | 940 |
| Global Partners L.P.                             | ​ | ​ | (f)(h)(m)(o)    | ​ | ​ | Midstream               | ​ | ​ | 6.3%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 7/15/22            | ​ | ​ | ​       | ​ | 68,335  | ​      | ​ | ​ | ​ | ​ | 68,188 | ​ | ​ | ​ | ​ | ​ | 70,385 |
| Global Partners L.P.                             | ​ | ​ | (f)(m)          | ​ | ​ | Midstream               | ​ | ​ | 7.0%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 6/15/23            | ​ | ​ | ​       | ​ | 2,824   | ​      | ​ | ​ | ​ | ​ | 2,466 | ​ | ​ | ​ | ​ | ​ | 2,909 |
| Great Western Petroleum, LLC                     | ​ | ​ | (f)(h)(o)       | ​ | ​ | Upstream                | ​ | ​ | 9.0%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 9/30/21            | ​ | ​ | ​       | ​ | 35,830  | ​      | ​ | ​ | ​ | ​ | 35,708 | ​ | ​ | ​ | ​ | ​ | 37,398 |
| Gulfport Energy Corp.                            | ​ | ​ | (h)(m)(o)       | ​ | ​ | Upstream                | ​ | ​ | 6.0%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 10/15/24           | ​ | ​ | ​       | ​ | 10,000  | ​      | ​ | ​ | ​ | ​ | 10,000 | ​ | ​ | ​ | ​ | ​ | 10,010 |
| Hammerhead Resources Inc.                        | ​ | ​ | (j)(m)          | ​ | ​ | Upstream                | ​ | ​ | 9.0%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 7/10/22            | ​ | ​ | ​       | ​ | 100,000 | ​      | ​ | ​ | ​ | ​ | 97,229 | ​ | ​ | ​ | ​ | ​ | 100,000 |
| Jupiter Resources Inc.                           | ​ | ​ | (h)(m)          | ​ | ​ | Upstream                | ​ | ​ | 8.5%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 10/1/22            | ​ | ​ | ​       | ​ | 76,125  | ​      | ​ | ​ | ​ | ​ | 72,383 | ​ | ​ | ​ | ​ | ​ | 47,007 |
| Lonestar Resources America Inc.                  | ​ | ​ | (f)(h)          | ​ | ​ | Upstream                | ​ | ​ | 8.8%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 4/15/19            | ​ | ​ | ​       | ​ | 24,200  | ​      | ​ | ​ | ​ | ​ | 24,055 | ​ | ​ | ​ | ​ | ​ | 25,289 |
| Lonestar Resources America Inc.                  | ​ | ​ | (g)             | ​ | ​ | Upstream                | ​ | ​ | 11.3%                     | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 1/1/23             | ​ | ​ | ​       | ​ | 25,000  | ​      | ​ | ​ | ​ | ​ | 25,000 | ​ | ​ | ​ | ​ | ​ | 25,563 |
| Martin Midstream Partners L.P.                   | ​ | ​ | (f)(h)(m)(o)    | ​ | ​ | Midstream               | ​ | ​ | 7.3%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 2/15/21            | ​ | ​ | ​       | ​ | 24,660  | ​      | ​ | ​ | ​ | ​ | 24,059 | ​ | ​ | ​ | ​ | ​ | 25,073 |
| Moss Creek Resources, LLC                        | ​ | ​ | (l)             | ​ | ​ | Upstream                | ​ | ​ | L+800                     | ​ | ​ | ​ | ​ | 1.5%    | ​  | ​ | ​ | 4/7/22             | ​ | ​ | ​       | ​ | 65,000  | ​      | ​ | ​ | ​ | ​ | 65,000 | ​ | ​ | ​ | ​ | ​ | 66,443 |
| ONEOK, Inc.                                      | ​ | ​ | (f)(m)          | ​ | ​ | Midstream               | ​ | ​ | 7.5%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 9/1/23             | ​ | ​ | ​       | ​ | 12,600  | ​      | ​ | ​ | ​ | ​ | 11,789 | ​ | ​ | ​ | ​ | ​ | 15,114 |
| Tenrgys, LLC                                     | ​ | ​ | (k)(p)(r)       | ​ | ​ | Upstream                | ​ | ​ | L+900                     | ​ | ​ | ​ | ​ | 2.5%    | ​  | ​ | ​ | 12/23/18           | ​ | ​ | ​       | ​ | 75,000  | ​      | ​ | ​ | ​ | ​ | 75,000 | ​ | ​ | ​ | ​ | ​ | 34,313 |
| Whiting Petroleum Corp.                          | ​ | ​ | (h)(m)(o)       | ​ | ​ | Upstream                | ​ | ​ | 5.0%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 3/15/19            | ​ | ​ | ​       | ​ | 11,685  | ​      | ​ | ​ | ​ | ​ | 11,034 | ​ | ​ | ​ | ​ | ​ | 11,990 |
| Whiting Petroleum Corp.                          | ​ | ​ | (f)(m)          | ​ | ​ | Upstream                | ​ | ​ | 5.8%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 3/15/21            | ​ | ​ | ​       | ​ | 7,000   | ​      | ​ | ​ | ​ | ​ | 6,479 | ​ | ​ | ​ | ​ | ​ | 7,219 |
| WildHorse Resource Development Corp.             | ​ | ​ | (h)(m)          | ​ | ​ | Upstream                | ​ | ​ | 6.9%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 2/1/25             | ​ | ​ | ​       | ​ | 10,000  | ​      | ​ | ​ | ​ | ​ | 9,930 | ​ | ​ | ​ | ​ | ​ | 10,242 |
| Zachry Holdings, Inc.                            | ​ | ​ | (f)             | ​ | ​ | Service & Equipment | ​ | ​ | 7.5%                      | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | 2/1/20             | ​ | ​ | ​       | ​ | 23,925  | ​      | ​ | ​ | ​ | ​ | 23,930 | ​ | ​ | ​ | ​ | ​ | 24,433 |
| Total Subordinated Debt                          | ​ | ​ | ​         | ​ | ​ | ​                 | ​ | ​ | ​                   | ​ | ​ | ​ | ​ | ​ | ​  | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​      | ​ | ​ | ​ | ​ | 1,229,790 | ​ | ​ | ​ | ​ | ​ | 1,203,524 |
| ​                                          |

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TABLE OF CONTENTS

| Portfolio Company(a)                                            | ​ | ​ | Footnotes           | ​ | ​ | Industry                | ​ | ​ | Rate(b)                             | ​ | ​ | Number ofShares | ​ | ​     | AmortizedCost | ​ | ​ | Fair Value(d) | ​ |
|-----------------------------------------------------------------|---------|---------|---------------------|---------|---------|-------------------------|---------|---------|-------------------------------------|---------|---------|-----------------|---------|-------------|---------------|---------|---------|---------------|---------|
| Equity/Other—13.9%(n)                                     | ​ | ​ | ​             | ​ | ​ | ​                 | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | ​     | ​       | ​ | ​ | ​       |
| Abaco Energy Technologies LLC, Common Equity                    | ​ | ​ | (r)                 | ​ | ​ | Service & Equipment | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 6,944,444   | ​       | ​ | ​ | ​       | $       | 6,944 | ​ | ​ | ​ | ​ | $ | 1,042 | ​ | ​ |
| Abaco Energy Technologies LLC, Preferred Equity                 | ​ | ​ | (r)                 | ​ | ​ | Service & Equipment | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 28,942,003  | ​       | ​ | ​ | ​       | ​ | 1,447 | ​ | ​ | ​ | ​ | ​ | 5,065 | ​ | ​ |
| Allied Downhole Technologies, LLC, Common Equity                | ​ | ​ | (k)(q)(r)           | ​ | ​ | Service & Equipment | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 7,431,113   | ​       | ​ | ​ | ​       | ​ | 7,223 | ​ | ​ | ​ | ​ | ​ | 1,858 | ​ | ​ |
| Allied Downhole Technologies, LLC, Warrants, 2/28/2019          | ​ | ​ | (k)(q)(r)           | ​ | ​ | Service & Equipment | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 5,344,680   | ​       | ​ | ​ | ​       | ​ | 1,865 | ​ | ​ | ​ | ​ | ​ | 1,336 | ​ | ​ |
| Altus Power America Holdings, LLC, Common Equity                | ​ | ​ | (k)(r)(aa)          | ​ | ​ | Power                   | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 12,474,205  | ​       | ​ | ​ | ​       | ​ | 12,474 | ​ | ​ | ​ | ​ | ​ | 1,871 | ​ | ​ |
| Altus Power America Holdings, LLC, Preferred Equity             | ​ | ​ | (k)(s)(aa)          | ​ | ​ | Power                   | ​ | ​ | 9.0%, 5.0% PIK (5.0% Max PIK)       | ​ | ​ | ​         | ​ | 25,792,683  | ​       | ​ | ​ | ​       | ​ | 25,793 | ​ | ​ | ​ | ​ | ​ | 25,793 | ​ | ​ |
| AP Exhaust Holdings, LLC, Class A1 Common Units            | ​ | ​ | (k)(q)(r)           | ​ | ​ | Service & Equipment | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 8           | ​       | ​ | ​ | ​       | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| AP Exhaust Holdings, LLC, Class A1 Preferred Units         | ​ | ​ | (k)(q)(r)           | ​ | ​ | Service & Equipment | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 803         | ​       | ​ | ​ | ​       | ​ | 895 | ​ | ​ | ​ | ​ | ​ | 811 | ​ | ​ |
| Ascent Resources Utica Holdings, LLC, Common Equity             | ​ | ​ | (r)(t)              | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 148,692,909 | ​       | ​ | ​ | ​       | ​ | 44,700 | ​ | ​ | ​ | ​ | ​ | 37,173 | ​ | ​ |
| BL Sand Hills Unit, L.P., Net Profits Interest                  | ​ | ​ | (r)(v)(aa)          | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | N/A         | ​       | ​ | ​ | ​       | ​ | 5,180 | ​ | ​ | ​ | ​ | ​ | 966 | ​ | ​ |
| BL Sand Hills Unit, L.P., Overriding Royalty Interest           | ​ | ​ | (v)(aa)             | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | N/A         | ​       | ​ | ​ | ​       | ​ | 740 | ​ | ​ | ​ | ​ | ​ | 726 | ​ | ​ |
| BL Sand Hills Unit, L.P., Series A Units                   | ​ | ​ | (i)(r)(aa)          | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 29,117      | ​       | ​ | ​ | ​       | ​ | 24,019 | ​ | ​ | ​ | ​ | ​ | 7,000 | ​ | ​ |
| Chisholm Oil and Gas, LLC, Series A Units                  | ​ | ​ | (i)(r)              | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 13,905,565  | ​       | ​ | ​ | ​       | ​ | 13,906 | ​ | ​ | ​ | ​ | ​ | 13,815 | ​ | ​ |
| Cimarron Energy Holdco Inc., Common Equity                      | ​ | ​ | (r)                 | ​ | ​ | Service & Equipment | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 3,675,487   | ​       | ​ | ​ | ​       | ​ | 3,323 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Cimarron Energy Holdco Inc., Preferred Equity                   | ​ | ​ | (r)                 | ​ | ​ | Service & Equipment | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 626,806     | ​       | ​ | ​ | ​       | ​ | 627 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Extraction Oil & Gas, Inc., Common Equity                   | ​ | ​ | (k)(r)(z)           | ​ | ​ | Upstream                | ​ | ​ |     ​ | ​ | ​ | ​         | ​ | 1,140,637   | ​       | ​ | ​ | ​       | ​ | 11,250 | ​ | ​ | ​ | ​ | ​ | 16,323 | ​ | ​ |
| FourPoint Energy, LLC, Common Equity, Class C-II-A Units   | ​ | ​ | (k)(q)(r)(aa)       | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 66,000      | ​       | ​ | ​ | ​       | ​ | 66,000 | ​ | ​ | ​ | ​ | ​ | 19,140 | ​ | ​ |
| FourPoint Energy, LLC, Common Equity, Class D Units   | ​ | ​ | (k)(q)(r)(aa)       | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 12,374      | ​       | ​ | ​ | ​       | ​ | 8,176 | ​ | ​ | ​ | ​ | ​ | 3,619 | ​ | ​ |
| FourPoint Energy, LLC, Common Equity, Class E-II Units     | ​ | ​ | (i)(r)(aa)          | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 150,937     | ​       | ​ | ​ | ​       | ​ | 37,734 | ​ | ​ | ​ | ​ | ​ | 43,395 | ​ | ​ |
| FourPoint Energy, LLC, Common Equity, Class E-III Units    | ​ | ​ | (i)(k)(q)(r)(aa)    | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 222,750     | ​       | ​ | ​ | ​       | ​ | 55,688 | ​ | ​ | ​ | ​ | ​ | 64,598 | ​ | ​ |
| Global Jet Capital Holdings, LP, Preferred Equity               | ​ | ​ | (r)                 | ​ | ​ | Service & Equipment | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 2,785,562   | ​       | ​ | ​ | ​       | ​ | 2,786 | ​ | ​ | ​ | ​ | ​ | 2,507 | ​ | ​ |
| Industrial Group Intermediate Holdings, LLC, Common Equity      | ​ | ​ | (k)(q)(r)           | ​ | ​ | Service & Equipment | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 472,755     | ​       | ​ | ​ | ​       | ​ | 473 | ​ | ​ | ​ | ​ | ​ | 709 | ​ | ​ |
| JSS Holdco, LLC, Net Profits Interest                           | ​ | ​ | (r)                 | ​ | ​ | Service & Equipment | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | N/A         | ​       | ​ | ​ | ​       | ​ | — | ​ | ​ | ​ | ​ | ​ | 103 | ​ | ​ |
| Lusk Operating LLC, Common Equity                               | ​ | ​ | (r)(u)(bb)          | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 2,000       | ​       | ​ | ​ | ​       | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| MB Precision Investment Holdings LLC, Class A-2 Units | ​ | ​ | (k)(q)(r)           | ​ | ​ | Service & Equipment | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 490,213     | ​       | ​ | ​ | ​       | ​ | 490 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| PDI Parent LLC, Common Equity                                   | ​ | ​ | (r)                 | ​ | ​ | Power                   | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 1,384,615   | ​       | ​ | ​ | ​       | ​ | 1,385 | ​ | ​ | ​ | ​ | ​ | 1,454 | ​ | ​ |
| Ridgeback Resources Inc., Common Equity                         | ​ | ​ | (k)(l)(m)(r)(w)(aa) | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 9,599,928   | ​       | ​ | ​ | ​       | ​ | 58,985 | ​ | ​ | ​ | ​ | ​ | 58,284 | ​ | ​ |
| SandRidge Energy, Inc., Common Equity                           | ​ | ​ | (h)(l)(m)(o)(r)(z)  | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 1,009,878   | ​       | ​ | ​ | ​       | ​ | 22,542 | ​ | ​ | ​ | ​ | ​ | 21,278 | ​ | ​ |
| Sunnova Energy Corp., Common Equity                             | ​ | ​ | (r)                 | ​ | ​ | Power                   | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 6,667,368   | ​       | ​ | ​ | ​       | ​ | 25,026 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Sunnova Energy Corp., Preferred Equity                          | ​ | ​ | (r)                 | ​ | ​ | Power                   | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 1,117,214   | ​       | ​ | ​ | ​       | ​ | 5,948 | ​ | ​ | ​ | ​ | ​ | 4,502 | ​ | ​ |
| Swift Worldwide Resources Holdco Limited, Common Equity         | ​ | ​ | (m)(r)(x)           | ​ | ​ | Service & Equipment | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 3,750,000   | ​       | ​ | ​ | ​       | ​ | 6,029 | ​ | ​ | ​ | ​ | ​ | 2,062 | ​ | ​ |
| Synergy Offshore LLC, Preferred Equity                          | ​ | ​ | (k)(p)(r)(y)        | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 71,131      | ​       | ​ | ​ | ​       | ​ | 93,009 | ​ | ​ | ​ | ​ | ​ | 25,465 | ​ | ​ |
| TE Holdings, LLC, Common Equity                                 | ​ | ​ | (i)(r)              | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 2,225,950   | ​       | ​ | ​ | ​       | ​ | 18,921 | ​ | ​ | ​ | ​ | ​ | 3,617 | ​ | ​ |
| TE Holdings, LLC, Preferred Equity                              | ​ | ​ | (l)(r)              | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 1,475,531   | ​       | ​ | ​ | ​       | ​ | 14,734 | ​ | ​ | ​ | ​ | ​ | 14,018 | ​ | ​ |
| The Brock Group, Inc., Common Equity                            | ​ | ​ | (j)(r)              | ​ | ​ | Service & Equipment | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 786,094     | ​       | ​ | ​ | ​       | ​ | 15,617 | ​ | ​ | ​ | ​ | ​ | 16,390 | ​ | ​ |
| Titan Energy, LLC, Common Equity                                | ​ | ​ | (k)(r)(z)(aa)       | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 555,496     | ​       | ​ | ​ | ​       | ​ | 17,554 | ​ | ​ | ​ | ​ | ​ | 844 | ​ | ​ |
| Total Safety Holdings, LLC, Common Equity                       | ​ | ​ | (j)(r)              | ​ | ​ | Service & Equipment | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 12,897      | ​       | ​ | ​ | ​       | ​ | 4,707 | ​ | ​ | ​ | ​ | ​ | 4,659 | ​ | ​ |
| Warren Resources, Inc., Common Equity                           | ​ | ​ | (l)(r)(aa)          | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 4,415,749   | ​       | ​ | ​ | ​       | ​ | 20,754 | ​ | ​ | ​ | ​ | ​ | 7,507 | ​ | ​ |
| White Star Petroleum Holdings, LLC, Common Equity               | ​ | ​ | (i)(r)              | ​ | ​ | Upstream                | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | 4,867,084   | ​       | ​ | ​ | ​       | ​ | 4,137 | ​ | ​ | ​ | ​ | ​ | 3,650 | ​ | ​ |
| Total Equity/Other                                              | ​ | ​ | ​             | ​ | ​ | ​                 | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | ​     | ​       | ​ | ​ | ​       | ​ | 641,081 | ​ | ​ | ​ | ​ | ​ | 411,580 | ​ | ​ |
| TOTAL INVESTMENTS—134.8%                                  | ​ | ​ | ​             | ​ | ​ | ​                 | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | ​     | ​       | ​ | ​ | ​       | $       | 4,357,766 | ​ | ​ | ​ | ​ | ​ | 3,996,705 | ​ | ​ |
| LIABILITIES IN EXCESS OF OTHER ASSETS—(34.8%)             | ​ | ​ | ​             | ​ | ​ | ​                 | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | ​     | ​       | ​ | ​ | ​       | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (1,030,663) | ​ | ​ |
| NET ASSETS—100.0%                                         | ​ | ​ | ​             | ​ | ​ | ​                 | ​ | ​ | ​                             | ​ | ​ | ​         | ​ | ​     | ​       | ​ | ​ | ​       | ​ | ​ | ​ | ​ | ​ | ​ | $ | 2,966,042 | ​ | ​ |
| ​                                                         |

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TABLE OF CONTENTS

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TABLE OF CONTENTS

| Portfolio Company                                             | ​ | ​ | Fair Value at December 31, 2016 | ​ | ​   | Purchases, Paid-In-Kind, Interest and Transfers In | ​ | ​ | Sales, Repayments and Transfers Out | ​ | ​ | Accretion of Discount | ​ | ​ | Net Realized Gain (Loss) | ​ | ​   | Net Change in Unrealized Appreciation (Depreciation) | ​ | ​ | Fair Value at December 31, 2017 | ​ | ​ | Interest Income(2) | ​ | ​ | PIK Income(2) | ​ | ​ | Fee Income(2) | ​ |
|---------------------------------------------------------------|---------|---------|--------------------------------------|---------|-----------|----------------------------------------------------|---------|---------|-------------------------------------|---------|---------|-----------------------|---------|---------|--------------------------|---------|-----------|------------------------------------------------------|---------|---------|--------------------------------------|---------|---------|--------------------|---------|---------|---------------|---------|---------|---------------|---------|
| Senior Secured Loans—First Lien                         | ​ | ​ | ​                              | ​ | ​   | ​                                            | ​ | ​ | ​                             | ​ | ​ | ​               | ​ | ​ | ​                  | ​ | ​   | ​                                              | ​ | ​ | ​                              | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​       | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Altus Power America, Inc.(1)                                  | ​ | ​ | ​                              | $       | 73,294    | ​                                            | ​ | ​ | ​                             | $       | 5,433   | ​               | ​ | ​ | ​                  | $       | —   | ​                                              | ​ | ​ | ​                              | $       | — | ​            | ​ | ​ | ​       | $       | — | ​       | ​ | ​ | ​ | $ | (3,374) | ​ | ​ | ​ | ​ | $ | 75,353 | ​ | ​ | ​ | ​ | $ | 7,152 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ |
| BL Sand Hills Unit, L.P.                                      | ​ | ​ | ​                              | ​ | —   | ​                                            | ​ | ​ | ​                             | ​ | 64,187  | ​               | ​ | ​ | ​                  | ​ | (44,460)  | ​                                              | ​ | ​ | ​                              | ​ | — | ​            | ​ | ​ | ​       | ​ | (2,358) | ​       | ​ | ​ | ​ | ​ | 2,631 | ​ | ​ | ​ | ​ | ​ | 20,000 | ​ | ​ | ​ | ​ | ​ | 3,857 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Sunnova Asset Portfolio 5 Holdings, LLC                  | ​ | ​ | ​                              | ​ | 151,148   | ​                                            | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | (149,652) | ​                                              | ​ | ​ | ​                              | ​ | 2,217   | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (3,713) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 6,992 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Warren Resources, Inc.                                        | ​ | ​ | ​                              | ​ | 78,437    | ​                                            | ​ | ​ | ​                             | ​ | 796     | ​               | ​ | ​ | ​                  | ​ | —   | ​                                              | ​ | ​ | ​                              | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | 1,981 | ​ | ​ | ​ | ​ | ​ | 81,214 | ​ | ​ | ​ | ​ | ​ | 7,818 | ​ | ​ | ​ | ​ | ​ | 796 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Senior Secured Loans—Second Lien                        | ​ | ​ | ​                              | ​ | ​   | ​                                            | ​ | ​ | ​                             | ​ | ​ | ​               | ​ | ​ | ​                  | ​ | ​   | ​                                              | ​ | ​ | ​                              | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​       | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Titan Energy Operating, LLC                                   | ​ | ​ | ​                              | ​ | 85,427    | ​                                            | ​ | ​ | ​                             | ​ | 9,863   | ​               | ​ | ​ | ​                  | ​ | (332)     | ​                                              | ​ | ​ | ​                              | ​ | 4,237   | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (37,169) | ​ | ​ | ​ | ​ | ​ | 62,026 | ​ | ​ | ​ | ​ | ​ | 16,269 | ​ | ​ | ​ | ​ | ​ | 9,863 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Senior Secured Bonds                                          | ​ | ​ | ​                              | ​ | ​   | ​                                            | ​ | ​ | ​                             | ​ | ​ | ​               | ​ | ​ | ​                  | ​ | ​   | ​                                              | ​ | ​ | ​                              | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​       | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| FourPoint Energy, LLC                                         | ​ | ​ | ​                              | ​ | 240,709   | ​                                            | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | (2,227)   | ​                                              | ​ | ​ | ​                              | ​ | 2,183   | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (1,719) | ​ | ​ | ​ | ​ | ​ | 238,946 | ​ | ​ | ​ | ​ | ​ | 22,834 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Ridgeback Resources Inc.                                      | ​ | ​ | ​                              | ​ | 3,887     | ​                                            | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —   | ​                                              | ​ | ​ | ​                              | ​ | 16      | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (16) | ​ | ​ | ​ | ​ | ​ | 3,887 | ​ | ​ | ​ | ​ | ​ | 473 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Sunnova Energy Corp(3)                                        | ​ | ​ | ​                              | ​ | —   | ​                                            | ​ | ​ | ​                             | ​ | 33,671  | ​               | ​ | ​ | ​                  | ​ | (33,671)  | ​                                              | ​ | ​ | ​                              | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 2,738 | ​ | ​ | ​ | ​ | ​ | 859 | ​ | ​ | ​ | ​ | ​ | 656 | ​ | ​ |
| Equity/Other                                                  | ​ | ​ | ​                              | ​ | ​   | ​                                            | ​ | ​ | ​                             | ​ | ​ | ​               | ​ | ​ | ​                  | ​ | ​   | ​                                              | ​ | ​ | ​                              | ​ | ​ | ​            | ​ | ​ | ​       | ​ | ​ | ​       | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Altus Power America Holdings, LLC, Common Equity              | ​ | ​ | ​                              | ​ | 12,474    | ​                                            | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —   | ​                                              | ​ | ​ | ​                              | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (10,603) | ​ | ​ | ​ | ​ | ​ | 1,871 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Altus Power America Holdings, LLC, Preferred Equity           | ​ | ​ | ​                              | ​ | 23,982    | ​                                            | ​ | ​ | ​                             | ​ | 1,811   | ​               | ​ | ​ | ​                  | ​ | —   | ​                                              | ​ | ​ | ​                              | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 25,793 | ​ | ​ | ​ | ​ | ​ | 3,586 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| BL Sand Hills Unit, L.P., Net Profits Interest                | ​ | ​ | ​                              | ​ | —   | ​                                            | ​ | ​ | ​                             | ​ | 5,180   | ​               | ​ | ​ | ​                  | ​ | —   | ​                                              | ​ | ​ | ​                              | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (4,214) | ​ | ​ | ​ | ​ | ​ | 966 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| BL Sand Hills Unit, L.P., Overriding Royalty Interest         | ​ | ​ | ​                              | ​ | —   | ​                                            | ​ | ​ | ​                             | ​ | 740     | ​               | ​ | ​ | ​                  | ​ | —   | ​                                              | ​ | ​ | ​                              | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (14) | ​ | ​ | ​ | ​ | ​ | 726 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| BL Sand Hills Unit, L.P., Series A Units            | ​ | ​ | ​                              | ​ | —   | ​                                            | ​ | ​ | ​                             | ​ | 24,019  | ​               | ​ | ​ | ​                  | ​ | —   | ​                                              | ​ | ​ | ​                              | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (17,019) | ​ | ​ | ​ | ​ | ​ | 7,000 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| FourPoint Energy, LLC, Common Equity, Class C-II-A Units | ​ | ​ | ​                              | ​ | 31,845    | ​                                            | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —   | ​                                              | ​ | ​ | ​                              | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (12,705) | ​ | ​ | ​ | ​ | ​ | 19,140 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| FourPoint Energy, LLC, Common Equity, Class D Units      | ​ | ​ | ​                              | ​ | 6,032     | ​                                            | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —   | ​                                              | ​ | ​ | ​                              | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (2,413) | ​ | ​ | ​ | ​ | ​ | 3,619 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| FourPoint Energy, LLC, Common Equity, Class E-II Units   | ​ | ​ | ​                              | ​ | 125,670   | ​                                            | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | (30,938)  | ​                                              | ​ | ​ | ​                              | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (51,337) | ​ | ​ | ​ | ​ | ​ | 43,395 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| FourPoint Energy, LLC, Common Equity, Class E-III Units  | ​ | ​ | ​                              | ​ | 107,477   | ​                                            | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —   | ​                                              | ​ | ​ | ​                              | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (42,879) | ​ | ​ | ​ | ​ | ​ | 64,598 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Ridgeback Resources Inc., Common Equity                       | ​ | ​ | ​                              | ​ | 58,985    | ​                                            | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —   | ​                                              | ​ | ​ | ​                              | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (701) | ​ | ​ | ​ | ​ | ​ | 58,284 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Sunnova Energy Corp., Common Equity(3)                        | ​ | ​ | ​                              | ​ | 36,204    | ​                                            | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | (25,026)  | ​                                              | ​ | ​ | ​                              | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (11,178) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Sunnova Energy Corp., Preferred Equity(3)                     | ​ | ​ | ​                              | ​ | 3,141     | ​                                            | ​ | ​ | ​                             | ​ | 2,868   | ​               | ​ | ​ | ​                  | ​ | (5,948)   | ​                                              | ​ | ​ | ​                              | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (61) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Titan Energy, LLC, Common Equity                              | ​ | ​ | ​                              | ​ | 13,332    | ​                                            | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —   | ​                                              | ​ | ​ | ​                              | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (12,488) | ​ | ​ | ​ | ​ | ​ | 844 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Warren Resources, Inc., Common Equity                    | ​ | ​ | ​                              | ​ | 18,988    | ​                                            | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | —   | ​                                              | ​ | ​ | ​                              | ​ | — | ​            | ​ | ​ | ​       | ​ | — | ​       | ​ | ​ | ​ | ​ | (11,481) | ​ | ​ | ​ | ​ | ​ | 7,507 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Total                                                         | ​ | ​ | ​                              | $       | 1,071,032 | ​                                            | ​ | ​ | ​                             | $       | 148,568 | ​               | ​ | ​ | ​                  | $       | (292,254) | ​                                              | ​ | ​ | ​                              | $       | 8,653   | ​            | ​ | ​ | ​       | $       | (2,358) | ​       | ​ | ​ | ​ | $ | (218,472) | ​ | ​ | ​ | ​ | $ | 715,169 | ​ | ​ | ​ | ​ | $ | 71,719 | ​ | ​ | ​ | ​ | $ | 11,518 | ​ | ​ | ​ | ​ | $ | 656 | ​ | ​ |
| ​                                                       |

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| Portfolio Company                     | ​ | ​ | Fair Value at December 31, 2016 | ​ | ​ | Purchases, Paid-In-Kind, Interest and Transfers In | ​ | ​ | Sales, Repayments and Transfers Out | ​ | ​ | Accretion of Discount | ​ | ​ | Net Realized Gain (Loss) | ​ | ​ | Net Change in Unrealized Appreciation (Depreciation) | ​ | ​ | Fair Value at December 31, 2017 | ​ | ​                   | ​ | ​ | ​ | ​ | ​ | ​                   |
|---------------------------------------|---------|---------|--------------------------------------|---------|---------|----------------------------------------------------|---------|---------|-------------------------------------|---------|---------|-----------------------|---------|---------|--------------------------|---------|---------|------------------------------------------------------|---------|---------|--------------------------------------|---------|---------------------------|---------|---------|---------|---------|---------|---------------------------|
| Senior Secured Loans—First Lien | ​ | ​ | ​                              | ​ | ​ | ​                                            | ​ | ​ | ​                             | ​ | ​ | ​               | ​ | ​ | ​                  | ​ | ​ | ​                                              | ​ | ​ | ​                              | ​ | ​                   | ​ | ​ | ​ | ​ | ​ | ​                   | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Lusk Operating LLC                    | ​ | ​ | ​                              | $       | 1,031   | ​                                            | ​ | ​ | ​                             | $       | 1,800   | ​               | ​ | ​ | ​                  | $       | — | ​                                              | ​ | ​ | ​                              | $       | —                   | ​ | ​ | ​ | ​ | $       | —                   | ​ | ​ | ​ | ​ | $ | (2,831) | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Equity/Other                          | ​ | ​ | ​                              | ​ | ​ | ​                                            | ​ | ​ | ​                             | ​ | ​ | ​               | ​ | ​ | ​                  | ​ | ​ | ​                                              | ​ | ​ | ​                              | ​ | ​                   | ​ | ​ | ​ | ​ | ​ | ​                   | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Lusk Operating LLC, Common Equity     | ​ | ​ | ​                              | ​ | — | ​                                            | ​ | ​ | ​                             | ​ | — | ​               | ​ | ​ | ​                  | ​ | (1,000) | ​                                              | ​ | ​ | ​                              | ​ | —                   | ​ | ​ | ​ | ​ | ​ | —                   | ​ | ​ | ​ | ​ | ​ | 1,000 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Total                                 | ​ | ​ | ​                              | $       | 1,031   | ​                                            | ​ | ​ | ​                             | $       | 1,800   | ​               | ​ | ​ | ​                  | $       | (1,000) | ​                                              | ​ | ​ | ​                              | $       |    — | ​ | ​ | ​ | ​ | $       |    — | ​ | ​ | ​ | ​ | $ | (1,831) | ​ | ​ | ​ | ​ | $ |    — | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| ​                               | ​ | ​ | ​                              | ​ | ​ | ​                                            | ​ | ​ | ​                             | ​ | ​ | ​               | ​ | ​ | ​                  | ​ | ​ | ​                                              | ​ | ​ | ​                              | ​ | ​                   | ​ | ​ | ​ | ​ | ​ | ​                   | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |

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| ​                              | ​ | ​ | Nine Months Ended September 30, | ​ |
|--------------------------------------|---------|---------|--------------------------------------|---------|
| ​                              | ​ | ​ | 2018                                 | ​ | ​ | 2017 | ​ |
| ​                              | ​ | ​ | Shares                               | ​ | ​ | Amount | ​ | ​ | Shares | ​ | ​ | Amount | ​ |
| Reinvestment of Distributions        | ​ | ​ | ​                              | ​ | 13,659,940 | ​ | ​ | ​ | ​ | $ | 90,329 | ​ | ​ | ​ | ​ | ​ | 18,821,761 | ​ | ​ | ​ | ​ | $ | 140,580 | ​ | ​ |
| Share Repurchase Program             | ​ | ​ | ​                              | ​ | (19,018,771) | ​ | ​ | ​ | ​ | ​ | (126,186) | ​ | ​ | ​ | ​ | ​ | (11,817,591) | ​ | ​ | ​ | ​ | ​ | (88,730) | ​ | ​ |
| Net Proceeds from Share Transactions | ​ | ​ | ​                              | ​ | (5,358,831) | ​ | ​ | ​ | ​ | $ | (35,857) | ​ | ​ | ​ | ​ | ​ | 7,004,170 | ​ | ​ | ​ | ​ | $ | 51,850 | ​ | ​ |

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| For the Three Months Ended | ​ | ​ | Repurchase Date       | ​ | ​ | Shares Repurchased | ​ | ​    | Percentage of Shares Tendered That Were Repurchased | ​ | ​ | Percentage of Outstanding Shares Repurchased as of the Repurchase Date | ​ | ​ | Repurchase Price Per Share | ​ | ​ | Aggregate Consideration for Repurchased Shares | ​ |
|----------------------------|---------|---------|-----------------------|---------|---------|--------------------|---------|------------|-----------------------------------------------------|---------|---------|------------------------------------------------------------------------|---------|---------|----------------------------|---------|---------|------------------------------------------------|---------|
| Fiscal 2017                | ​ | ​ | ​               | ​ | ​ | ​            | ​ | ​    | ​                                             | ​ | ​ | ​                                                                | ​ | ​ | ​                    | ​ | ​ | ​                                        | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| December 31, 2016     | ​ | ​ | January 3, 2017  | ​ | ​ | ​            | ​ | 2,239,480  | ​                                             | ​ | ​ | ​                                                                | ​ | 100%    | ​                    | ​ | ​ | ​                                        | ​ | 0.51% | ​ | ​ | ​ | ​ | $ | 7.70 | ​ | ​ | ​ | ​ | $ | 17,244 | ​ | ​ |
| March 31, 2017        | ​ | ​ | April 17, 2017   | ​ | ​ | ​            | ​ | 4,587,306  | ​                                             | ​ | ​ | ​                                                                | ​ | 100%    | ​                    | ​ | ​ | ​                                        | ​ | 1.03% | ​ | ​ | ​ | ​ | $ | 7.75 | ​ | ​ | ​ | ​ | ​ | 35,552 | ​ | ​ |
| June 30, 2017         | ​ | ​ | July 3, 2017     | ​ | ​ | ​            | ​ | 4,990,805  | ​                                             | ​ | ​ | ​                                                                | ​ | 100%    | ​                    | ​ | ​ | ​                                        | ​ | 1.12% | ​ | ​ | ​ | ​ | $ | 7.20 | ​ | ​ | ​ | ​ | ​ | 35,934 | ​ | ​ |
| Total                      | ​ | ​ | ​               | ​ | ​ | ​            | ​ | 11,817,591 | ​                                             | ​ | ​ | ​                                                                | ​ | ​ | ​                    | ​ | ​ | ​                                        | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 88,730 | ​ | ​ |
| Fiscal 2018                | ​ | ​ | ​               | ​ | ​ | ​            | ​ | ​    | ​                                             | ​ | ​ | ​                                                                | ​ | ​ | ​                    | ​ | ​ | ​                                        | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| December 31, 2017     | ​ | ​ | January 12, 2018 | ​ | ​ | ​            | ​ | 9,018,665  | ​                                             | ​ | ​ | ​                                                                | ​ | 64%     | ​                    | ​ | ​ | ​                                        | ​ | 2.02% | ​ | ​ | ​ | ​ | $ | 6.70 | ​ | ​ | ​ | ​ | $ | 60,425 | ​ | ​ |
| March 31, 2018        | ​ | ​ | April 2, 2018    | ​ | ​ | ​            | ​ | 4,786,015  | ​                                             | ​ | ​ | ​                                                                | ​ | 24%     | ​                    | ​ | ​ | ​                                        | ​ | 1.08% | ​ | ​ | ​ | ​ | $ | 6.55 | ​ | ​ | ​ | ​ | ​ | 31,348 | ​ | ​ |
| June 30, 2018         | ​ | ​ | July 2, 2018     | ​ | ​ | ​            | ​ | 4,554,498  | ​                                             | ​ | ​ | ​                                                                | ​ | 20%     | ​                    | ​ | ​ | ​                                        | ​ | 1.03% | ​ | ​ | ​ | ​ | $ | 6.60 | ​ | ​ | ​ | ​ | ​ | 30,060 | ​ | ​ |
| Total                      | ​ | ​ | ​               | ​ | ​ | ​            | ​ | 18,359,178 | ​                                             | ​ | ​ | ​                                                                | ​ | ​ | ​                    | ​ | ​ | ​                                        | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 121,833 | ​ | ​ |
| ​                    |

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| ​                       | ​ | ​ | ​                                                                           | ​ | ​ | ​                                 | ​ | ​ | Three Months Ended September 30, | ​ | ​ | Nine Months Ended September 30, |
|-------------------------------|---------|---------|-----------------------------------------------------------------------------------|---------|---------|-----------------------------------------|---------|---------|---------------------------------------|---------|---------|--------------------------------------|
| Related Party                 | ​ | ​ | Source Agreement                                                                  | ​ | ​ | Description                             | ​ | ​ | 2018                                  | ​ | ​ | 2017                                 | ​ | ​ | 2018 | ​ | ​ | 2017 |
| FS Advisor and FS/EIG Advisor | ​ | ​ | FS Advisor Investment Advisory Agreement and FS/EIG Investment Advisory Agreement | ​ | ​ | Base Management Fee(1)                  | ​ | ​ | ​                               | $       | 16,977  | ​                              | ​ | ​ | ​ | $ | 22,031 | ​ | ​ | ​ | ​ | $ | 52,393 | ​ | ​ | ​ | ​ | $ | 67,104 |
| FS Advisor                    | ​ | ​ | FS Advisor Investment Advisory Agreement                                          | ​ | ​ | Subordinated Incentive Fee on Income(2) | ​ | ​ | ​                               | ​ | — | ​                              | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | $ | 10,499 |
| FS Advisor and FS/EIG Advisor | ​ | ​ | FS Advisor Investment Advisory Agreement and FS/EIG Investment Advisory Agreement | ​ | ​ | Administrative Services Expenses(3)     | ​ | ​ | ​                               | $       | 1,211   | ​                              | ​ | ​ | ​ | $ | 611 | ​ | ​ | ​ | ​ | $ | 2,806 | ​ | ​ | ​ | ​ | $ | 2,218 |
| FS Advisor                    | ​ | ​ | FS Advisor Expense Support and Conditional Reimbursement Agreement                | ​ | ​ | Expense Recoupment(4)                   | ​ | ​ | ​                               | ​ | — | ​                              | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | $ | 2,858 |

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| For the Three Months Ended | ​ | ​ | Amount of Expense Reimbursement Payment | ​ | ​   | Annualized “Other Operating Expenses” Ratio as of the Date of Expense Reimbursement | ​ | ​ | Annualized Rate of Distributions Per Share(1) | ​ | ​ | Reimbursement Eligibility Expiration | ​ |
|----------------------------|---------|---------|-----------------------------------------|---------|-----------|-------------------------------------------------------------------------------------------------|---------|---------|-----------------------------------------------|---------|---------|--------------------------------------|---------|
| March 31, 2017        | ​ | ​ | ​                                 | $       | 15,362(2) | ​                                                                                         | ​ | ​ | ​                                       | ​ | 0.40%   | ​                              | ​ | ​ | ​ | ​ | 9.14% | ​ | ​ | ​ | March 31, 2020 | ​ |
| September 30, 2017    | ​ | ​ | ​                                 | ​ | 7,095     | ​                                                                                         | ​ | ​ | ​                                       | ​ | 0.36%   | ​                              | ​ | ​ | ​ | ​ | 9.91% | ​ | ​ | ​ | September 30, 2020 | ​ |
| December 31, 2017     | ​ | ​ | ​                                 | ​ | 5,647     | ​                                                                                         | ​ | ​ | ​                                       | ​ | 0.36%   | ​                              | ​ | ​ | ​ | ​ | 10.57% | ​ | ​ | ​ | December 31, 2020 | ​ |
| Total                      | ​ | ​ | ​                                 | $       | 28,104    | ​                                                                                         | ​ | ​ | ​                                       | ​ | ​ | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| ​                    |

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| ​                    | ​ | ​ | Distribution | ​ |
|----------------------------|---------|---------|--------------|---------|
| For the Three Months Ended | ​ | ​ | Per Share    | ​ | ​ | Amount | ​ |
| Fiscal 2017                | ​ | ​ | ​      | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| March 31, 2017        | ​ | ​ | ​      | $       | 0.17713 | ​ | ​ | ​ | ​ | $ | 77,984 | ​ | ​ |
| June 30, 2017         | ​ | ​ | ​      | ​ | 0.17713 | ​ | ​ | ​ | ​ | ​ | 78,374 | ​ | ​ |
| September 30, 2017    | ​ | ​ | ​      | ​ | 0.17713 | ​ | ​ | ​ | ​ | ​ | 78,115 | ​ | ​ |
| Total                      | ​ | ​ | ​      | $       | 0.53139 | ​ | ​ | ​ | ​ | $ | 234,473 | ​ | ​ |
| Fiscal 2018                | ​ | ​ | ​      | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| March 31, 2018        | ​ | ​ | ​      | $       | 0.12500 | ​ | ​ | ​ | ​ | $ | 54,823 | ​ | ​ |
| June 30, 2018         | ​ | ​ | ​      | ​ | 0.12500 | ​ | ​ | ​ | ​ | ​ | 54,811 | ​ | ​ |
| September 30, 2018    | ​ | ​ | ​      | ​ | 0.12500 | ​ | ​ | ​ | ​ | ​ | 54,724 | ​ | ​ |
| Total                      | ​ | ​ | ​      | $       | 0.37500 | ​ | ​ | ​ | ​ | $ | 164,358 | ​ | ​ |
| ​                    |

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| ​                                                        | ​ | ​ | Nine Months Ended September 30, | ​ |
|----------------------------------------------------------------|---------|---------|--------------------------------------|---------|
| ​                                                        | ​ | ​ | 2018                                 | ​ | ​ | 2017 | ​ |
| Source of Distribution                                         | ​ | ​ | Distribution Amount                  | ​ | ​ | Percentage | ​ | ​ | Distribution Amount | ​ | ​ | Percentage | ​ |
| Offering proceeds                                              | ​ | ​ | ​                              | $       | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Borrowings                                                     | ​ | ​ | ​                              | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Net investment income (prior to expense reimbursement)(1)      | ​ | ​ | ​                              | ​ | 164,358 | ​ | ​ | ​ | ​ | ​ | 100% | ​ | ​ | ​ | ​ | ​ | 210,425 | ​ | ​ | ​ | ​ | ​ | 90% | ​ | ​ |
| Short-term capital gains proceeds from the sale of assets      | ​ | ​ | ​                              | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Long-term capital gains proceeds from the sale of assets       | ​ | ​ | ​                              | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Non-capital gains proceeds from the sale of assets             | ​ | ​ | ​                              | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Distributions on account of investments in portfolio companies | ​ | ​ | ​                              | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 1,591 | ​ | ​ | ​ | ​ | ​ | 0% | ​ | ​ |
| Expense reimbursement from sponsor                             | ​ | ​ | ​                              | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 22,457 | ​ | ​ | ​ | ​ | ​ | 10% | ​ | ​ |
| Total                                                          | ​ | ​ | ​                              | $       | 164,358 | ​ | ​ | ​ | ​ | ​ | 100% | ​ | ​ | ​ | ​ | $ | 234,473 | ​ | ​ | ​ | ​ | ​ | 100% | ​ | ​ |
| ​                                                        |

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| ​                                                                                     | ​ | ​ | Nine Months Ended September 30, | ​ |
|---------------------------------------------------------------------------------------------|---------|---------|--------------------------------------|---------|
| ​                                                                                     | ​ | ​ | 2018                                 | ​ | ​ | 2017 | ​ |
| GAAP-basis net investment income                                                            | ​ | ​ | ​                              | $       | 139,631 | ​ | ​ | ​ | ​ | $ | 220,441 | ​ | ​ |
| Reclassification of unamortized original issue discount, amendment fees and prepayment fees | ​ | ​ | ​                              | ​ | (11,621) | ​ | ​ | ​ | ​ | ​ | (20,176) | ​ | ​ |
| GAAP versus tax-basis impact of consolidation of certain subsidiaries                       | ​ | ​ | ​                              | ​ | 18,847 | ​ | ​ | ​ | ​ | ​ | 21,443 | ​ | ​ |
| Income subject to tax not recorded for GAAP                                                 | ​ | ​ | ​                              | ​ | 24,262 | ​ | ​ | ​ | ​ | ​ | 11,190 | ​ | ​ |
| Other miscellaneous differences                                                             | ​ | ​ | ​                              | ​ | (18) | ​ | ​ | ​ | ​ | ​ | (16) | ​ | ​ |
| Tax-basis net investment income                                                             | ​ | ​ | ​                              | $       | 171,101 | ​ | ​ | ​ | ​ | $ | 232,882 | ​ | ​ |
| ​                                                                                     |
| ​                                                                                                   | ​ | ​ | September 30, 2018 (Unaudited) | ​ | ​   | December 31, 2017 | ​ |
|-----------------------------------------------------------------------------------------------------------|---------|---------|-------------------------------------|---------|-----------|------------------------|---------|
| Distributable ordinary income                                                                             | ​ | ​ | ​                             | $       | 6,743     | ​                | ​ | ​ | ​ | $ | — | ​ | ​ |
| Accumulated capital losses(1)                                                                             | ​ | ​ | ​                             | ​ | (521,367) | ​                | ​ | ​ | ​ | ​ | (427,687) | ​ | ​ |
| Other temporary differences                                                                               | ​ | ​ | ​                             | ​ | (183)     | ​                | ​ | ​ | ​ | ​ | (198) | ​ | ​ |
| Net unrealized appreciation (depreciation) on investments and unrealized gain/loss on foreign currency(2) | ​ | ​ | ​                             | ​ | (340,786) | ​                | ​ | ​ | ​ | ​ | (500,674) | ​ | ​ |
| Total                                                                                                     | ​ | ​ | ​                             | $       | (855,593) | ​                | ​ | ​ | ​ | $ | (928,559) | ​ | ​ |
| ​                                                                                                   |

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| ​                                | ​ | ​ | September 30, 2018 (Unaudited) | ​ | ​   | December 31, 2017 | ​ |
|----------------------------------------|---------|---------|-------------------------------------|---------|-----------|------------------------|---------|
| ​                                | ​ | ​ | Amortized Cost(1)                   | ​ | ​   | Fair Value             | ​ | ​ | Percentage of Portfolio | ​ | ​ | Amortized Cost(1) | ​ | ​ | Fair Value | ​ | ​ | Percentage of Portfolio | ​ |
| Senior Secured Loans—First Lien  | ​ | ​ | ​                             | $       | 1,008,714 | ​                | ​ | ​ | ​ | $ | 968,673 | ​ | ​ | ​ | ​ | ​ | 26% | ​ | ​ | ​ | ​ | $ | 961,883 | ​ | ​ | ​ | ​ | $ | 924,926 | ​ | ​ | ​ | ​ | ​ | 23% | ​ | ​ |
| Senior Secured Loans—Second Lien | ​ | ​ | ​                             | ​ | 702,241   | ​                | ​ | ​ | ​ | ​ | 623,391 | ​ | ​ | ​ | ​ | ​ | 17% | ​ | ​ | ​ | ​ | ​ | 860,470 | ​ | ​ | ​ | ​ | ​ | 796,524 | ​ | ​ | ​ | ​ | ​ | 20% | ​ | ​ |
| Senior Secured Bonds                   | ​ | ​ | ​                             | ​ | 552,010   | ​                | ​ | ​ | ​ | ​ | 568,332 | ​ | ​ | ​ | ​ | ​ | 15% | ​ | ​ | ​ | ​ | ​ | 664,542 | ​ | ​ | ​ | ​ | ​ | 660,151 | ​ | ​ | ​ | ​ | ​ | 17% | ​ | ​ |
| Subordinated Debt                      | ​ | ​ | ​                             | ​ | 778,558   | ​                | ​ | ​ | ​ | ​ | 778,157 | ​ | ​ | ​ | ​ | ​ | 21% | ​ | ​ | ​ | ​ | ​ | 1,229,790 | ​ | ​ | ​ | ​ | ​ | 1,203,524 | ​ | ​ | ​ | ​ | ​ | 30% | ​ | ​ |
| Equity/Other(2)                        | ​ | ​ | ​                             | ​ | 967,932   | ​                | ​ | ​ | ​ | ​ | 789,336 | ​ | ​ | ​ | ​ | ​ | 21% | ​ | ​ | ​ | ​ | ​ | 641,081 | ​ | ​ | ​ | ​ | ​ | 411,580 | ​ | ​ | ​ | ​ | ​ | 10% | ​ | ​ |
| Total                                  | ​ | ​ | ​                             | $       | 4,009,455 | ​                | ​ | ​ | ​ | $ | 3,727,889 | ​ | ​ | ​ | ​ | ​ | 100% | ​ | ​ | ​ | ​ | $ | 4,357,766 | ​ | ​ | ​ | ​ | $ | 3,996,705 | ​ | ​ | ​ | ​ | ​ | 100% | ​ | ​ |

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| ​                 | ​ | ​ | September 30, 2018 (Unaudited) | ​ | ​   | December 31, 2017  | ​ |
|-------------------------|---------|---------|-------------------------------------|---------|-----------|-------------------------|---------|
| Industry Classification | ​ | ​ | Fair Value                          | ​ | ​   | Percentage of Portfolio | ​ | ​ | Fair Value | ​ | ​ | Percentage of Portfolio | ​ |
| Upstream                | ​ | ​ | ​                             | $       | 2,344,772 | ​                 | ​ | ​ | ​ | ​ | 63% | ​ | ​ | ​ | ​ | $ | 2,539,867 | ​ | ​ | ​ | ​ | ​ | 64% | ​ | ​ |
| Midstream               | ​ | ​ | ​                             | ​ | 670,460   | ​                 | ​ | ​ | ​ | ​ | 18% | ​ | ​ | ​ | ​ | ​ | 441,189 | ​ | ​ | ​ | ​ | ​ | 11% | ​ | ​ |
| Downstream              | ​ | ​ | ​                             | ​ | —   | ​                 | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 47,831 | ​ | ​ | ​ | ​ | ​ | 1% | ​ | ​ |
| Power                   | ​ | ​ | ​                             | ​ | 319,741   | ​                 | ​ | ​ | ​ | ​ | 9% | ​ | ​ | ​ | ​ | ​ | 231,495 | ​ | ​ | ​ | ​ | ​ | 6% | ​ | ​ |
| Service & Equipment | ​ | ​ | ​                             | ​ | 338,477   | ​                 | ​ | ​ | ​ | ​ | 9% | ​ | ​ | ​ | ​ | ​ | 672,278 | ​ | ​ | ​ | ​ | ​ | 16% | ​ | ​ |
| Industrials(1)          | ​ | ​ | ​                             | ​ | 54,439    | ​                 | ​ | ​ | ​ | ​ | 1% | ​ | ​ | ​ | ​ | ​ | 64,045 | ​ | ​ | ​ | ​ | ​ | 2% | ​ | ​ |
| Total                   | ​ | ​ | ​                             | $       | 3,727,889 | ​                 | ​ | ​ | ​ | ​ | 100% | ​ | ​ | ​ | ​ | $ | 3,996,705 | ​ | ​ | ​ | ​ | ​ | 100% | ​ | ​ |
| ​                 |

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| Valuation Inputs                                       | ​ | ​ | September 30, 2018 (Unaudited) | ​ | ​   | December 31, 2017 | ​ |
|--------------------------------------------------------|---------|---------|-------------------------------------|---------|-----------|------------------------|---------|
| Level 1—Price quotations in active markets  | ​ | ​ | ​                             | $       | 27,240    | ​                | ​ | ​ | ​ | $ | 38,445 | ​ | ​ |
| Level 2—Significant other observable inputs | ​ | ​ | ​                             | ​ | 1,126,805 | ​                | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Level 3—Significant unobservable inputs     | ​ | ​ | ​                             | ​ | 2,573,844 | ​                | ​ | ​ | ​ | ​ | 3,958,260 | ​ | ​ |
| Total                                                  | ​ | ​ | ​                             | $       | 3,727,889 | ​                | ​ | ​ | ​ | $ | 3,996,705 | ​ | ​ |
| ​                                                |

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| ​                                                                                                                                                                                                | ​ | ​ | For the Nine Months Ended September 30, 2018 | ​ |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------|---------|---------------------------------------------------|---------|
| ​                                                                                                                                                                                                | ​ | ​ | Senior Secured Loans— First Lien            | ​ | ​ | Senior Secured Loans— Second Lien | ​ | ​ | Senior Secured Bonds | ​ | ​ | Subordinated Debt | ​ | ​ | Equity/​Other | ​ | ​ | Total | ​ |
| Fair value at beginning of period                                                                                                                                                                      | ​ | ​ | ​                                           | $       | 924,926 | ​ | ​ | ​ | ​ | $ | 796,524 | ​ | ​ | ​ | ​ | $ | 660,151 | ​ | ​ | ​ | ​ | $ | 1,203,524 | ​ | ​ | ​ | ​ | $ | 373,135 | ​ | ​ | ​ | ​ | $ | 3,958,260 | ​ | ​ |
| Accretion of discount (amortization of premium)                                                                                                                                                        | ​ | ​ | ​                                           | ​ | 710 | ​ | ​ | ​ | ​ | ​ | 555 | ​ | ​ | ​ | ​ | ​ | 2,144 | ​ | ​ | ​ | ​ | ​ | 29 | ​ | ​ | ​ | ​ | ​ | 2,347 | ​ | ​ | ​ | ​ | ​ | 5,785 | ​ | ​ |
| Net realized gain (loss)                                                                                                                                                                               | ​ | ​ | ​                                           | ​ | (2,649) | ​ | ​ | ​ | ​ | ​ | 653 | ​ | ​ | ​ | ​ | ​ | 55 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (84) | ​ | ​ | ​ | ​ | ​ | (2,025) | ​ | ​ |
| Net change in unrealized appreciation (depreciation)                                                                                                                                                   | ​ | ​ | ​                                           | ​ | (637) | ​ | ​ | ​ | ​ | ​ | (35,697) | ​ | ​ | ​ | ​ | ​ | 966 | ​ | ​ | ​ | ​ | ​ | 14,338 | ​ | ​ | ​ | ​ | ​ | 63,801 | ​ | ​ | ​ | ​ | ​ | 42,771 | ​ | ​ |
| Purchases                                                                                                                                                                                              | ​ | ​ | ​                                           | ​ | 188,220 | ​ | ​ | ​ | ​ | ​ | 86,095 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 12,947 | ​ | ​ | ​ | ​ | ​ | 339,950 | ​ | ​ | ​ | ​ | ​ | 627,212 | ​ | ​ |
| Paid-in-kind interest                                                                                                                                                                                  | ​ | ​ | ​                                           | ​ | 1,204 | ​ | ​ | ​ | ​ | ​ | 3,376 | ​ | ​ | ​ | ​ | ​ | 1,408 | ​ | ​ | ​ | ​ | ​ | 1,103 | ​ | ​ | ​ | ​ | ​ | 369 | ​ | ​ | ​ | ​ | ​ | 7,460 | ​ | ​ |
| Sales and repayments                                                                                                                                                                                   | ​ | ​ | ​                                           | ​ | (155,953) | ​ | ​ | ​ | ​ | ​ | (34,654) | ​ | ​ | ​ | ​ | ​ | (14,044) | ​ | ​ | ​ | ​ | ​ | (65,000) | ​ | ​ | ​ | ​ | ​ | (6,945) | ​ | ​ | ​ | ​ | ​ | (276,596) | ​ | ​ |
| Net transfers in or out of Level 3(1)                                                                                                                                                             | ​ | ​ | ​                                           | ​ | (265,915) | ​ | ​ | ​ | ​ | ​ | (236,115) | ​ | ​ | ​ | ​ | ​ | (171,431) | ​ | ​ | ​ | ​ | ​ | (1,093,268) | ​ | ​ | ​ | ​ | ​ | (22,294) | ​ | ​ | ​ | ​ | ​ | (1,789,023) | ​ | ​ |
| Fair value at end of period                                                                                                                                                                            | ​ | ​ | ​                                           | $       | 689,906 | ​ | ​ | ​ | ​ | $ | 580,737 | ​ | ​ | ​ | ​ | $ | 479,249 | ​ | ​ | ​ | ​ | $ | 73,673 | ​ | ​ | ​ | ​ | $ | 750,279 | ​ | ​ | ​ | ​ | $ | 2,573,844 | ​ | ​ |
| The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date | ​ | ​ | ​                                           | $       | (5,617) | ​ | ​ | ​ | ​ | $ | 50,735 | ​ | ​ | ​ | ​ | $ | (5,845) | ​ | ​ | ​ | ​ | $ | 15,762 | ​ | ​ | ​ | ​ | $ | 33,523 | ​ | ​ | ​ | ​ | $ | 88,558 | ​ | ​ |
| ​                                                                                                                                                                                                |
| ​                                                                                                                                                                                                | ​ | ​ | For the Nine Months Ended September 30, 2017 | ​ |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------|---------|---------------------------------------------------|---------|
| ​                                                                                                                                                                                                | ​ | ​ | Senior Secured Loans— First Lien            | ​ | ​ | Senior Secured Loans— Second Lien | ​ | ​ | Senior Secured Bonds | ​ | ​ | Subordinated Debt | ​ | ​ | Equity/​Other | ​ | ​ | Total | ​ |
| Fair value at beginning of period                                                                                                                                                                      | ​ | ​ | ​                                           | $       | 912,491 | ​ | ​ | ​ | ​ | $ | 873,869 | ​ | ​ | ​ | ​ | $ | 397,614 | ​ | ​ | ​ | ​ | $ | 1,043,167 | ​ | ​ | ​ | ​ | $ | 636,571 | ​ | ​ | ​ | ​ | $ | 3,863,712 | ​ | ​ |
| Accretion of discount (amortization of premium)                                                                                                                                                        | ​ | ​ | ​                                           | ​ | 3,769 | ​ | ​ | ​ | ​ | ​ | 5,850 | ​ | ​ | ​ | ​ | ​ | 1,034 | ​ | ​ | ​ | ​ | ​ | 7,015 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 17,668 | ​ | ​ |
| Net realized gain (loss)                                                                                                                                                                               | ​ | ​ | ​                                           | ​ | (4,219) | ​ | ​ | ​ | ​ | ​ | (42,952) | ​ | ​ | ​ | ​ | ​ | 801 | ​ | ​ | ​ | ​ | ​ | (8,916) | ​ | ​ | ​ | ​ | ​ | (14,958) | ​ | ​ | ​ | ​ | ​ | (70,244) | ​ | ​ |
| Net change in unrealized appreciation (depreciation)                                                                                                                                                   | ​ | ​ | ​                                           | ​ | (2,509) | ​ | ​ | ​ | ​ | ​ | 11,854 | ​ | ​ | ​ | ​ | ​ | (13,411) | ​ | ​ | ​ | ​ | ​ | (7,235) | ​ | ​ | ​ | ​ | ​ | (139,572) | ​ | ​ | ​ | ​ | ​ | (150,873) | ​ | ​ |
| Purchases                                                                                                                                                                                              | ​ | ​ | ​                                           | ​ | 316,317 | ​ | ​ | ​ | ​ | ​ | 417,845 | ​ | ​ | ​ | ​ | ​ | 240,254 | ​ | ​ | ​ | ​ | ​ | 596,374 | ​ | ​ | ​ | ​ | ​ | 25,820 | ​ | ​ | ​ | ​ | ​ | 1,596,610 | ​ | ​ |
| Paid-in-kind interest                                                                                                                                                                                  | ​ | ​ | ​                                           | ​ | 9,074 | ​ | ​ | ​ | ​ | ​ | 12,282 | ​ | ​ | ​ | ​ | ​ | 361 | ​ | ​ | ​ | ​ | ​ | 950 | ​ | ​ | ​ | ​ | ​ | 3,751 | ​ | ​ | ​ | ​ | ​ | 26,418 | ​ | ​ |
| Sales and repayments                                                                                                                                                                                   | ​ | ​ | ​                                           | ​ | (289,346) | ​ | ​ | ​ | ​ | ​ | (408,129) | ​ | ​ | ​ | ​ | ​ | (68,859) | ​ | ​ | ​ | ​ | ​ | (286,687) | ​ | ​ | ​ | ​ | ​ | (28,328) | ​ | ​ | ​ | ​ | ​ | (1,081,349) | ​ | ​ |
| Net transfers in or out of Level 3                                                                                                                                                                | ​ | ​ | ​                                           | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Fair value at end of period                                                                                                                                                                            | ​ | ​ | ​                                           | $       | 945,577 | ​ | ​ | ​ | ​ | $ | 870,619 | ​ | ​ | ​ | ​ | $ | 557,794 | ​ | ​ | ​ | ​ | $ | 1,344,668 | ​ | ​ | ​ | ​ | $ | 483,284 | ​ | ​ | ​ | ​ | $ | 4,201,942 | ​ | ​ |
| The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date | ​ | ​ | ​                                           | $       | (2,208) | ​ | ​ | ​ | ​ | $ | (16,657) | ​ | ​ | ​ | ​ | $ | (8,966) | ​ | ​ | ​ | ​ | $ | (41,985) | ​ | ​ | ​ | ​ | $ | (51,054) | ​ | ​ | ​ | ​ | $ | (120,870) | ​ | ​ |
| ​                                                                                                                                                                                                |

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| Type of Investment                     | ​ | ​ | Fair Value at September 30, 2018 (Unaudited) | ​ | ​   | Valuation Technique(1) | ​ | ​ | Unobservable Input     | ​ | ​ | Range                                             | ​ | ​ | Weighted Average                        | ​ |
|----------------------------------------|---------|---------|---------------------------------------------------|---------|-----------|------------------------|---------|---------|------------------------|---------|---------|---------------------------------------------------|---------|---------|-----------------------------------------|---------|
| Senior Secured Loans—First Lien  | ​ | ​ | ​                                           | $       | 649,070   | ​                | ​ | ​ | Market Comparables     | ​ | ​ | Market Yield (%)                                  | ​ | ​ | 8.8% – 18.0%          | ​ | ​ | 10.8% | ​ |
| ​                                | ​ | ​ | ​                                           | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | EBITDA Multiples (x)                              | ​ | ​ | 5.5x – 12.2x          | ​ | ​ | 7.1x | ​ |
| ​                                | ​ | ​ | ​                                           | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | Proved Reserves Multiples (Mmboe)                 | ​ | ​ | $5.9 – $7.5           | ​ | ​ | $6.7 | ​ |
| ​                                | ​ | ​ | ​                                           | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | PV-10 Multiples (x)                               | ​ | ​ | 0.5x – 0.5x           | ​ | ​ | 0.5x | ​ |
| ​                                | ​ | ​ | ​                                           | ​ | 40,836    | ​                | ​ | ​ | Other(2)               | ​ | ​ | Other(2)                                          | ​ | ​ | N/A                                     | ​ | ​ | N/A | ​ |
| Senior Secured Loans—Second Lien | ​ | ​ | ​                                           | ​ | 510,531   | ​                | ​ | ​ | Market Comparables     | ​ | ​ | Market Yield (%)                                  | ​ | ​ | 8.6% – 16.3%          | ​ | ​ | 11.3% | ​ |
| ​                                | ​ | ​ | ​                                           | ​ | 70,206    | ​                | ​ | ​ | Other(2)               | ​ | ​ | Other(2)                                          | ​ | ​ | N/A                                     | ​ | ​ | N/A | ​ |
| Senior Secured Bonds                   | ​ | ​ | ​                                           | ​ | 479,249   | ​                | ​ | ​ | Market Comparables     | ​ | ​ | Market Yield (%)                                  | ​ | ​ | 6.6% – 12.4%          | ​ | ​ | 8.5% | ​ |
| Subordinated Debt                      | ​ | ​ | ​                                           | ​ | 73,673    | ​                | ​ | ​ | Market Comparables     | ​ | ​ | Market Yield (%)                                  | ​ | ​ | 10.0% – 15.3%         | ​ | ​ | 12.6% | ​ |
| ​                                | ​ | ​ | ​                                           | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | PV-10 Multiples (x)                               | ​ | ​ | 0.9x – 1.1x           | ​ | ​ | 1.0x | ​ |
| Equity/Other                           | ​ | ​ | ​                                           | ​ | 687,334   | ​                | ​ | ​ | Market Comparables     | ​ | ​ | EBITDA Multiples (x)                              | ​ | ​ | 5.0x – 12.4x          | ​ | ​ | 7.6x | ​ |
| ​                                | ​ | ​ | ​                                           | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | Production Multiples (Mboe/d)                     | ​ | ​ | $33,750.0 – $53,750.0 | ​ | ​ | $40,525.4 | ​ |
| ​                                | ​ | ​ | ​                                           | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | Proved Reserves Multiples (Mmboe)                 | ​ | ​ | $4.8 – $18.0          | ​ | ​ | $8.9 | ​ |
| ​                                | ​ | ​ | ​                                           | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | Production Multiples (MMcfe/d)                    | ​ | ​ | $4,200.0 – $4,700.0   | ​ | ​ | $4,450.0 | ​ |
| ​                                | ​ | ​ | ​                                           | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | Proved & Probable Reserves Multiples (Mboe/d) | ​ | ​ | $5.0 – $6.0           | ​ | ​ | $5.5 | ​ |
| ​                                | ​ | ​ | ​                                           | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | Proved Reserves Multiples (Bcfe)                  | ​ | ​ | $1.2 – $1.3           | ​ | ​ | $1.2 | ​ |
| ​                                | ​ | ​ | ​                                           | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | PV-10 Multiples (x)                               | ​ | ​ | 0.5x – 2.4x           | ​ | ​ | 1.4x | ​ |
| ​                                | ​ | ​ | ​                                           | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | Capacity Multiple ($/kW)                          | ​ | ​ | $1,875.0 – $2,125.0   | ​ | ​ | $2,000.0 | ​ |
| ​                                | ​ | ​ | ​                                           | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | Market Yield (%)                                  | ​ | ​ | 10.0% – 15.3%         | ​ | ​ | 10.4% | ​ |
| ​                                | ​ | ​ | ​                                           | ​ | 37,562    | ​                | ​ | ​ | Discounted Cash Flow   | ​ | ​ | Discount Rate (%)                                 | ​ | ​ | 14.0% – 30.5%         | ​ | ​ | 15.6% | ​ |
| ​                                | ​ | ​ | ​                                           | ​ | 957       | ​                | ​ | ​ | Option Valuation Model | ​ | ​ | Volatility (%)                                    | ​ | ​ | 25.0% – 25.0%         | ​ | ​ | 25.0% | ​ |
| ​                                | ​ | ​ | ​                                           | ​ | 24,426    | ​                | ​ | ​ | Other(2)               | ​ | ​ | Other(2)                                          | ​ | ​ | N/A                                     | ​ | ​ | N/A | ​ |
| Total                                  | ​ | ​ | ​                                           | $       | 2,573,844 | ​                | ​ | ​ | ​                | ​ | ​ |
| ​                                |

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TABLE OF CONTENTS

| Type of Investment                     | ​ | ​ | Fair Value at December 31, 2017 | ​ | ​   | Valuation Technique(1) | ​ | ​ | Unobservable Input     | ​ | ​ | Range                             | ​ | ​ | Weighted Average                        | ​ |
|----------------------------------------|---------|---------|--------------------------------------|---------|-----------|------------------------|---------|---------|------------------------|---------|---------|-----------------------------------|---------|---------|-----------------------------------------|---------|
| Senior Secured Loans—First Lien  | ​ | ​ | ​                              | $       | 560,200   | ​                | ​ | ​ | Market Comparables     | ​ | ​ | Market Yield (%)                  | ​ | ​ | 8.0% – 13.0%          | ​ | ​ | 10.4% | ​ |
| ​                                | ​ | ​ | ​                              | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | EBITDA Multiples (x)              | ​ | ​ | 5.3x – 8.0x           | ​ | ​ | 6.4x | ​ |
| ​                                | ​ | ​ | ​                              | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | Proved Reserves Multiples (Mmboe) | ​ | ​ | $5.8 – $6.3           | ​ | ​ | $6.0 | ​ |
| ​                                | ​ | ​ | ​                              | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | PV-10 Multiples (x)               | ​ | ​ | 0.4x – 0.5x           | ​ | ​ | 0.4x | ​ |
| ​                                | ​ | ​ | ​                              | ​ | 273,133   | ​                | ​ | ​ | Market Quotes          | ​ | ​ | Indicative Dealer Quotes          | ​ | ​ | 71.3% – 102.0%        | ​ | ​ | 98.4% | ​ |
| ​                                | ​ | ​ | ​                              | ​ | 91,593    | ​                | ​ | ​ | Other(2)               | ​ | ​ | Other(2)                          | ​ | ​ | N/A                                     | ​ | ​ | N/A | ​ |
| Senior Secured Loans—Second Lien | ​ | ​ | ​                              | ​ | 588,486   | ​                | ​ | ​ | Market Comparables     | ​ | ​ | Market Yield (%)                  | ​ | ​ | 8.5% – 20.7%          | ​ | ​ | 11.9% | ​ |
| ​                                | ​ | ​ | ​                              | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | EBITDA Multiples (x)              | ​ | ​ | 6.0x – 6.5x           | ​ | ​ | 6.3x | ​ |
| ​                                | ​ | ​ | ​                              | ​ | 14,850    | ​                | ​ | ​ | Cost                   | ​ | ​ | Cost                              | ​ | ​ | 100.0% – 100.0%       | ​ | ​ | 100.0% | ​ |
| ​                                | ​ | ​ | ​                              | ​ | 193,188   | ​                | ​ | ​ | Market Quotes          | ​ | ​ | Indicative Dealer Quotes          | ​ | ​ | 31.0% – 101.3%        | ​ | ​ | 92.6% | ​ |
| Senior Secured Bonds                   | ​ | ​ | ​                              | ​ | 488,721   | ​                | ​ | ​ | Market Comparables     | ​ | ​ | Market Yield (%)                  | ​ | ​ | 7.7% – 12.3%          | ​ | ​ | 8.9% | ​ |
| ​                                | ​ | ​ | ​                              | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | Production Multiples (Mboe/d)     | ​ | ​ | $42,250.0 – $44,750.0 | ​ | ​ | $43,500.0 | ​ |
| ​                                | ​ | ​ | ​                              | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | Proved Reserves Multiples (Mmboe) | ​ | ​ | $10.3 – $11.3         | ​ | ​ | $10.8 | ​ |
| ​                                | ​ | ​ | ​                              | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | PV-10 Multiples (x)               | ​ | ​ | 0.8x – 0.8x           | ​ | ​ | 0.8x | ​ |
| ​                                | ​ | ​ | ​                              | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | EBITDA Multiples (x)              | ​ | ​ | 4.8x – 5.3x           | ​ | ​ | 5.0x | ​ |
| ​                                | ​ | ​ | ​                              | ​ | 171,430   | ​                | ​ | ​ | Market Quotes          | ​ | ​ | Indicative Dealer Quotes          | ​ | ​ | 73.0% – 107.8%        | ​ | ​ | 89.1% | ​ |
| Subordinated Debt                      | ​ | ​ | ​                              | ​ | 110,255   | ​                | ​ | ​ | Market Comparables     | ​ | ​ | Market Yield (%)                  | ​ | ​ | 11.0% – 14.8%         | ​ | ​ | 11.4% | ​ |
| ​                                | ​ | ​ | ​                              | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | PV-10 Multiples (x)               | ​ | ​ | 1.2x – 1.2x           | ​ | ​ | 1.2x | ​ |
| ​                                | ​ | ​ | ​                              | ​ | 1,093,269 | ​                | ​ | ​ | Market Quotes          | ​ | ​ | Indicative Dealer Quotes          | ​ | ​ | 50.0% – 120.2%        | ​ | ​ | 100.7% | ​ |
| Equity/Other                           | ​ | ​ | ​                              | ​ | 329,226   | ​                | ​ | ​ | Market Comparables     | ​ | ​ | EBITDA Multiples (x)              | ​ | ​ | 5.5x – 23.5x          | ​ | ​ | 8.1x | ​ |
| ​                                | ​ | ​ | ​                              | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | Production Multiples (Mboe/d)     | ​ | ​ | $32,500.0 – $51,250.0 | ​ | ​ | $37,007.0 | ​ |
| ​                                | ​ | ​ | ​                              | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | Proved Reserves Multiples (Mmboe) | ​ | ​ | $8.3 – $11.3          | ​ | ​ | $9.1 | ​ |
| ​                                | ​ | ​ | ​                              | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | Production Multiples (MMcfe/d)    | ​ | ​ | $5,000.0 – $5,500.0   | ​ | ​ | $5,250.0 | ​ |
| ​                                | ​ | ​ | ​                              | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | Proved Reserves Multiples (Bcfe)  | ​ | ​ | $1.8 – $2.0           | ​ | ​ | $1.9 | ​ |
| ​                                | ​ | ​ | ​                              | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | PV-10 Multiples (x)               | ​ | ​ | 0.8x – 2.6x           | ​ | ​ | 1.9x | ​ |
| ​                                | ​ | ​ | ​                              | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | Capacity Multiple ($/kW)          | ​ | ​ | $2,000.0 – $2,250.0   | ​ | ​ | $2,125.0 | ​ |
| ​                                | ​ | ​ | ​                              | ​ | ​   | ​                | ​ | ​ | ​                | ​ | ​ | Market Yield (%)                  | ​ | ​ | 15.3% – 15.8%         | ​ | ​ | 15.5% | ​ |
| ​                                | ​ | ​ | ​                              | ​ | 1,692     | ​                | ​ | ​ | Discounted Cash Flow   | ​ | ​ | Discount Rate (%)                 | ​ | ​ | 11.0% – 30.5%         | ​ | ​ | 12.2% | ​ |
| ​                                | ​ | ​ | ​                              | ​ | 103       | ​                | ​ | ​ | Option Valuation Model | ​ | ​ | Volatility (%)                    | ​ | ​ | 30.0% – 30.0%         | ​ | ​ | 30.0% | ​ |
| ​                                | ​ | ​ | ​                              | ​ | 19,820    | ​                | ​ | ​ | Other(2)               | ​ | ​ | Other(2)                          | ​ | ​ | N/A                                     | ​ | ​ | N/A | ​ |
| ​                                | ​ | ​ | ​                              | ​ | 22,294    | ​                | ​ | ​ | Market Quotes          | ​ | ​ | Indicative Dealer Quotes          | ​ | ​ | $1.5 – $372.5         | ​ | ​ | $81.7 | ​ |
| Total                                  | ​ | ​ | ​                              | $       | 3,958,260 | ​                | ​ | ​ | ​                | ​ | ​ | ​                           | ​ | ​ | ​                                 | ​ | ​ | ​ | ​ |
| ​                                |

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| ​                 | ​ | ​ | As of September 30, 2018 (Unaudited) | ​ |
|-------------------------|---------|---------|-------------------------------------------|---------|
| Arrangement(1)          | ​ | ​ | Type of Arrangement                       | ​ | ​ | Rate | ​ | ​ | Amount Outstanding | ​ | ​ | Amount Available | ​ | ​ | Maturity Date | ​ |
| Goldman Facility        | ​ | ​ | Term                                      | ​ | ​ | L+3.72% | ​ | ​ | ​ | $ | 425,000 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | September 15, 2019 | ​ |
| JPMorgan Facility       | ​ | ​ | Revolving/Term                            | ​ | ​ | L+2.75% | ​ | ​ | ​ | ​ | 206,667 | ​ | ​ | ​ | ​ | ​ | 413,333 | ​ | ​ | ​ | February 16, 2023 | ​ |
| Senior Secured Notes(2) | ​ | ​ | Bond                                      | ​ | ​ | 7.50% | ​ | ​ | ​ | ​ | 500,000 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | August 15, 2023 | ​ |
| Total                   | ​ | ​ | ​                                   | ​ | ​ | ​ | ​ | ​ | ​ | $ | 1,131,667 | ​ | ​ | ​ | ​ | $ | 413,333 | ​ | ​ | ​ | ​ | ​ |
| ​                 |
| ​                       | ​ | ​ | As of December 31, 2017 | ​ |
|-------------------------------|---------|---------|------------------------------|---------|
| Arrangement(1)                | ​ | ​ | Type of Arrangement          | ​ | ​ | Rate | ​ | ​ | Amount Outstanding | ​ | ​ | Amount Available | ​ | ​ | Maturity Date | ​ |
| Barclays Credit Facility      | ​ | ​ | Revolving                    | ​ | ​ | L+3.25% | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 100,000 | ​ | ​ | ​ | May 18, 2021 | ​ |
| BNP Facility                  | ​ | ​ | Prime Brokerage              | ​ | ​ | L+1.35% | ​ | ​ | ​ | ​ | 300,000 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | September 27, 2018(3) | ​ |
| Deutsche Bank Credit Facility | ​ | ​ | Revolving                    | ​ | ​ | L+2.05% | ​ | ​ | ​ | ​ | 340,000 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | June 11, 2018 | ​ |
| Fortress Facility             | ​ | ​ | Term                         | ​ | ​ | L+5.00%(4) | ​ | ​ | ​ | ​ | 155,000 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | November 6, 2020 | ​ |
| Goldman Facility              | ​ | ​ | Term                         | ​ | ​ | L+ 3.72% | ​ | ​ | ​ | ​ | 425,000 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | September 15, 2019 | ​ |
| Total                         | ​ | ​ | ​                      | ​ | ​ | ​ | ​ | ​ | ​ | $ | 1,220,000 | ​ | ​ | ​ | ​ | $ | 100,000 | ​ | ​ | ​ | ​ | ​ |
| ​                       |
| ​                       | ​ | ​ | Three Months Ended September 30, | ​ |
|-------------------------------|---------|---------|---------------------------------------|---------|
| ​                       | ​ | ​ | 2018                                  | ​ | ​ | 2017 | ​ |
| Arrangement(1)                | ​ | ​ | Direct Interest Expense(2)            | ​ | ​ | Amortization of Deferred Financing Costs and Discount | ​ | ​ | Total Interest Expense | ​ | ​ | Direct Interest Expense(2) | ​ | ​ | Amortization of Deferred Financing Costs | ​ | ​ | Total Interest Expense | ​ |
| Barclays Credit Facility      | ​ | ​ | ​                               | $       | 47 | ​ | ​ | ​ | ​ | $ | 132 | ​ | ​ | ​ | ​ | $ | 179 | ​ | ​ | ​ | ​ | $ | 96 | ​ | ​ | ​ | ​ | $ | 15 | ​ | ​ | ​ | ​ | $ | 111 | ​ | ​ |
| BNP Facility                  | ​ | ​ | ​                               | ​ | 882 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 882 | ​ | ​ | ​ | ​ | ​ | 1,825 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 1,825 | ​ | ​ |
| Deutsche Bank Credit Facility | ​ | ​ | ​                               | ​ | 796 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 796 | ​ | ​ | ​ | ​ | ​ | 2,285 | ​ | ​ | ​ | ​ | ​ | 298 | ​ | ​ | ​ | ​ | ​ | 2,583 | ​ | ​ |
| Fortress Facility             | ​ | ​ | ​                               | ​ | 1,515 | ​ | ​ | ​ | ​ | ​ | 730 | ​ | ​ | ​ | ​ | ​ | 2,245 | ​ | ​ | ​ | ​ | ​ | 2,401 | ​ | ​ | ​ | ​ | ​ | 68 | ​ | ​ | ​ | ​ | ​ | 2,469 | ​ | ​ |
| Goldman Facility              | ​ | ​ | ​                               | ​ | 6,582 | ​ | ​ | ​ | ​ | ​ | 149 | ​ | ​ | ​ | ​ | ​ | 6,731 | ​ | ​ | ​ | ​ | ​ | 5,425 | ​ | ​ | ​ | ​ | ​ | 148 | ​ | ​ | ​ | ​ | ​ | 5,573 | ​ | ​ |
| JPMorgan Facility             | ​ | ​ | ​                               | ​ | 1,477 | ​ | ​ | ​ | ​ | ​ | 239 | ​ | ​ | ​ | ​ | ​ | 1,716 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Senior Secured Notes          | ​ | ​ | ​                               | ​ | 4,688 | ​ | ​ | ​ | ​ | ​ | 477 | ​ | ​ | ​ | ​ | ​ | 5,165 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Goldman Repurchase Financing  | ​ | ​ | ​                               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Natixis Credit Facility       | ​ | ​ | ​                               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 64 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 64 | ​ | ​ |
| Wells Fargo Credit Facility   | ​ | ​ | ​                               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 62 | ​ | ​ | ​ | ​ | ​ | 961 | ​ | ​ | ​ | ​ | ​ | 1,023 | ​ | ​ |
| Total                         | ​ | ​ | ​                               | $       | 15,987 | ​ | ​ | ​ | ​ | $ | 1,727 | ​ | ​ | ​ | ​ | $ | 17,714 | ​ | ​ | ​ | ​ | $ | 12,158 | ​ | ​ | ​ | ​ | $ | 1,490 | ​ | ​ | ​ | ​ | $ | 13,648 | ​ | ​ |
| ​                       |

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| ​                       | ​ | ​ | Nine Months Ended September 30, | ​ |
|-------------------------------|---------|---------|--------------------------------------|---------|
| ​                       | ​ | ​ | 2018                                 | ​ | ​ | 2017 | ​ |
| Arrangement(1)                | ​ | ​ | Direct Interest Expense(2)           | ​ | ​ | Amortization of Deferred Financing Costs and Discount | ​ | ​ | Total Interest Expense | ​ | ​ | Direct Interest Expense(2) | ​ | ​ | Amortization of Deferred Financing Costs | ​ | ​ | Total Interest Expense | ​ |
| Barclays Credit Facility      | ​ | ​ | ​                              | $       | 236 | ​ | ​ | ​ | ​ | $ | 196 | ​ | ​ | ​ | ​ | $ | 432 | ​ | ​ | ​ | ​ | $ | 301 | ​ | ​ | ​ | ​ | $ | 43 | ​ | ​ | ​ | ​ | $ | 344 | ​ | ​ |
| BNP Facility                  | ​ | ​ | ​                              | ​ | 5,016 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 5,016 | ​ | ​ | ​ | ​ | ​ | 4,537 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 4,537 | ​ | ​ |
| Deutsche Bank Credit Facility | ​ | ​ | ​                              | ​ | 6,378 | ​ | ​ | ​ | ​ | ​ | 524 | ​ | ​ | ​ | ​ | ​ | 6,902 | ​ | ​ | ​ | ​ | ​ | 6,163 | ​ | ​ | ​ | ​ | ​ | 856 | ​ | ​ | ​ | ​ | ​ | 7,019 | ​ | ​ |
| Fortress Facility             | ​ | ​ | ​                              | ​ | 6,726 | ​ | ​ | ​ | ​ | ​ | 884 | ​ | ​ | ​ | ​ | ​ | 7,610 | ​ | ​ | ​ | ​ | ​ | 6,946 | ​ | ​ | ​ | ​ | ​ | 203 | ​ | ​ | ​ | ​ | ​ | 7,149 | ​ | ​ |
| Goldman Facility              | ​ | ​ | ​                              | ​ | 18,703 | ​ | ​ | ​ | ​ | ​ | 439 | ​ | ​ | ​ | ​ | ​ | 19,142 | ​ | ​ | ​ | ​ | ​ | 8,762 | ​ | ​ | ​ | ​ | ​ | 265 | ​ | ​ | ​ | ​ | ​ | 9,027 | ​ | ​ |
| JPMorgan Faciity              | ​ | ​ | ​                              | ​ | 1,477 | ​ | ​ | ​ | ​ | ​ | 239 | ​ | ​ | ​ | ​ | ​ | 1,716 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Senior Secured Notes          | ​ | ​ | ​                              | ​ | 4,688 | ​ | ​ | ​ | ​ | ​ | 477 | ​ | ​ | ​ | ​ | ​ | 5,165 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Goldman Repurchase Financing  | ​ | ​ | ​                              | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 4,305 | ​ | ​ | ​ | ​ | ​ | 91 | ​ | ​ | ​ | ​ | ​ | 4,396 | ​ | ​ |
| Natixis Credit Facility       | ​ | ​ | ​                              | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 750 | ​ | ​ | ​ | ​ | ​ | 342 | ​ | ​ | ​ | ​ | ​ | 1,092 | ​ | ​ |
| Wells Fargo Credit Facility   | ​ | ​ | ​                              | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 530 | ​ | ​ | ​ | ​ | ​ | 1,360 | ​ | ​ | ​ | ​ | ​ | 1,890 | ​ | ​ |
| Total                         | ​ | ​ | ​                              | $       | 43,224 | ​ | ​ | ​ | ​ | $ | 2,759 | ​ | ​ | ​ | ​ | $ | 45,983 | ​ | ​ | ​ | ​ | $ | 32,294 | ​ | ​ | ​ | ​ | $ | 3,160 | ​ | ​ | ​ | ​ | $ | 35,454 | ​ | ​ |
| ​                       |

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| ​                                                                         | ​ | ​ | Nine Months Ended September 30, 2018 (Unaudited) | ​ | ​     | Year Ended December 31, 2017 | ​ |
|---------------------------------------------------------------------------------|---------|---------|-------------------------------------------------------|---------|-------------|-----------------------------------|---------|
| Per Share Data:(1)                                                              | ​ | ​ | ​                                               | ​ | ​     | ​                           | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Net asset value, beginning of period                                            | ​ | ​ | ​                                               | $       | 6.65        | ​                           | ​ | ​ | ​ | $ | 7.61 | ​ | ​ |
| Results of operations(2)                                                        | ​ | ​ | ​                                               | ​ | ​     | ​                           | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Net investment income                                                           | ​ | ​ | ​                                               | ​ | 0.32        | ​                           | ​ | ​ | ​ | ​ | 0.65 | ​ | ​ |
| Net realized gain (loss) and unrealized appreciation (depreciation)             | ​ | ​ | ​                                               | ​ | (0.01)      | ​                           | ​ | ​ | ​ | ​ | (0.90) | ​ | ​ |
| Net increase (decrease) in net assets resulting from operations                 | ​ | ​ | ​                                               | ​ | 0.31        | ​                           | ​ | ​ | ​ | ​ | (0.25) | ​ | ​ |
| Shareholder distributions(3)                                                    | ​ | ​ | ​                                               | ​ | ​     | ​                           | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Distributions from net investment income                                        | ​ | ​ | ​                                               | ​ | (0.38)      | ​                           | ​ | ​ | ​ | ​ | (0.71) | ​ | ​ |
| Distributions representing tax return of capital                                | ​ | ​ | ​                                               | ​ | —     | ​                           | ​ | ​ | ​ | ​ | (0.00) | ​ | ​ |
| Net decrease in net assets resulting from shareholder distributions             | ​ | ​ | ​                                               | ​ | (0.38)      | ​                           | ​ | ​ | ​ | ​ | (0.71) | ​ | ​ |
| Capital share transactions                                                      | ​ | ​ | ​                                               | ​ | ​     | ​                           | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Issuance of common shares(4)                                                    | ​ | ​ | ​                                               | ​ | —     | ​                           | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Repurchases of common shares(5)                                                 | ​ | ​ | ​                                               | ​ | —     | ​                           | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Net increase (decrease) in net assets resulting from capital share transactions | ​ | ​ | ​                                               | ​ | —     | ​                           | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Net asset value, end of period                                                  | ​ | ​ | ​                                               | $       | 6.58        | ​                           | ​ | ​ | ​ | $ | 6.65 | ​ | ​ |
| Shares outstanding, end of period                                               | ​ | ​ | ​                                               | ​ | 440,686,304 | ​                           | ​ | ​ | ​ | ​ | 446,045,135 | ​ | ​ |
| Total return(6)                                                                 | ​ | ​ | ​                                               | ​ | 4.70%       | ​                           | ​ | ​ | ​ | ​ | (3.65)% | ​ | ​ |
| Total return (without assuming reinvestment of distributions)(6)                | ​ | ​ | ​                                               | ​ | 4.66%       | ​                           | ​ | ​ | ​ | ​ | (3.29)% | ​ | ​ |
| Ratio/Supplemental Data:                                                        | ​ | ​ | ​                                               | ​ | ​     | ​                           | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Net assets, end of period                                                       | ​ | ​ | ​                                               | $       | 2,900,836   | ​                           | ​ | ​ | ​ | $ | 2,966,042 | ​ | ​ |
| Ratio of net investment income to average net assets(7)                         | ​ | ​ | ​                                               | ​ | 6.42%       | ​                           | ​ | ​ | ​ | ​ | 8.82% | ​ | ​ |
| Ratio of total operating expenses to average net assets(7)                      | ​ | ​ | ​                                               | ​ | 4.99%       | ​                           | ​ | ​ | ​ | ​ | 4.94% | ​ | ​ |
| Portfolio turnover(8)                                                           | ​ | ​ | ​                                               | ​ | 34.87%      | ​                           | ​ | ​ | ​ | ​ | 34.08% | ​ | ​ |
| Total amount of senior securities outstanding, exclusive of treasury securities | ​ | ​ | ​                                               | $       | 1,131,667   | ​                           | ​ | ​ | ​ | $ | 1,220,000 | ​ | ​ |
| Asset coverage per unit(9)                                                      | ​ | ​ | ​                                               | ​ | 3.56        | ​                           | ​ | ​ | ​ | ​ | 3.43 | ​ | ​ |

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| ​                                                           | ​ | ​ | Nine Months Ended September 30, 2018 (Unaudited) | ​ | ​ | Year Ended December 31, 2017 | ​ |
|-------------------------------------------------------------------|---------|---------|-------------------------------------------------------|---------|---------|-----------------------------------|---------|
| Ratio of subordinated income incentive fees to average net assets | ​ | ​ | ​                                               | ​ | — | ​                           | ​ | ​ | ​ | ​ | 0.32% | ​ | ​ |
| Ratio of interest expense to average net assets                   | ​ | ​ | ​                                               | ​ | 2.11%   | ​                           | ​ | ​ | ​ | ​ | 1.52% | ​ | ​ |

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| Net Investment Activity | ​ | ​ | For the Three Months Ended September 30, 2018 | ​ | ​   | For the Nine Months Ended September 30, 2018 | ​ |
|-------------------------|---------|---------|----------------------------------------------------|---------|-----------|---------------------------------------------------|---------|
| Purchases               | ​ | ​ | ​                                            | $       | 502,652   | ​                                           | ​ | ​ | ​ | $ | 1,291,089 | ​ | ​ |
| Sales and Repayments    | ​ | ​ | ​                                            | ​ | (274,078) | ​                                           | ​ | ​ | ​ | ​ | (1,572,644) | ​ | ​ |
| Net Portfolio Activity  | ​ | ​ | ​                                            | $       | 228,574   | ​                                           | ​ | ​ | ​ | $ | (281,555) | ​ | ​ |
| ​                 |
| ​                                | ​ | ​ | For the Three Months Ended September 30, 2018 | ​ | ​ | For the Nine Months Ended September 30, 2018 | ​ |
|----------------------------------------|---------|---------|----------------------------------------------------|---------|---------|---------------------------------------------------|---------|
| New Investment Activity by Asset Class | ​ | ​ | Purchases                                          | ​ | ​ | Percentage                                        | ​ | ​ | Purchases | ​ | ​ | Percentage | ​ |
| Senior Secured Loans—First Lien  | ​ | ​ | ​                                            | $       | 161,663 | ​                                           | ​ | ​ | ​ | ​ | 32% | ​ | ​ | ​ | ​ | $ | 414,560 | ​ | ​ | ​ | ​ | ​ | 32% | ​ | ​ |
| Senior Secured Loans—Second Lien | ​ | ​ | ​                                            | ​ | 94,931  | ​                                           | ​ | ​ | ​ | ​ | 19% | ​ | ​ | ​ | ​ | ​ | 109,589 | ​ | ​ | ​ | ​ | ​ | 8% | ​ | ​ |
| Senior Secured Bonds                   | ​ | ​ | ​                                            | ​ | 17,212  | ​                                           | ​ | ​ | ​ | ​ | 3% | ​ | ​ | ​ | ​ | ​ | 86,612 | ​ | ​ | ​ | ​ | ​ | 7% | ​ | ​ |
| Subordinated Debt                      | ​ | ​ | ​                                            | ​ | 185,161 | ​                                           | ​ | ​ | ​ | ​ | 37% | ​ | ​ | ​ | ​ | ​ | 306,906 | ​ | ​ | ​ | ​ | ​ | 24% | ​ | ​ |
| Equity/Other                           | ​ | ​ | ​                                            | ​ | 43,685  | ​                                           | ​ | ​ | ​ | ​ | 9% | ​ | ​ | ​ | ​ | ​ | 373,422 | ​ | ​ | ​ | ​ | ​ | 29% | ​ | ​ |
| Total                                  | ​ | ​ | ​                                            | $       | 502,652 | ​                                           | ​ | ​ | ​ | ​ | 100% | ​ | ​ | ​ | ​ | $ | 1,291,089 | ​ | ​ | ​ | ​ | ​ | 100% | ​ | ​ |
| ​                                |

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| ​                                | ​ | ​ | September 30, 2018 (Unaudited) | ​ | ​   | December 31, 2017 | ​ |
|----------------------------------------|---------|---------|-------------------------------------|---------|-----------|------------------------|---------|
| ​                                | ​ | ​ | Amortized Cost(1)                   | ​ | ​   | Fair Value             | ​ | ​ | Percentage of Portfolio | ​ | ​ | Amortized Cost(1) | ​ | ​ | Fair Value | ​ | ​ | Percentage of Portfolio | ​ |
| Senior Secured Loans—First Lien  | ​ | ​ | ​                             | $       | 1,008,714 | ​                | ​ | ​ | ​ | $ | 968,673 | ​ | ​ | ​ | ​ | ​ | 26% | ​ | ​ | ​ | ​ | $ | 961,883 | ​ | ​ | ​ | ​ | $ | 924,926 | ​ | ​ | ​ | ​ | ​ | 23% | ​ | ​ |
| Senior Secured Loans—Second Lien | ​ | ​ | ​                             | ​ | 702,241   | ​                | ​ | ​ | ​ | ​ | 623,391 | ​ | ​ | ​ | ​ | ​ | 17% | ​ | ​ | ​ | ​ | ​ | 860,470 | ​ | ​ | ​ | ​ | ​ | 796,524 | ​ | ​ | ​ | ​ | ​ | 20% | ​ | ​ |
| Senior Secured Bonds                   | ​ | ​ | ​                             | ​ | 552,010   | ​                | ​ | ​ | ​ | ​ | 568,332 | ​ | ​ | ​ | ​ | ​ | 15% | ​ | ​ | ​ | ​ | ​ | 664,542 | ​ | ​ | ​ | ​ | ​ | 660,151 | ​ | ​ | ​ | ​ | ​ | 17% | ​ | ​ |
| Subordinated Debt                      | ​ | ​ | ​                             | ​ | 778,558   | ​                | ​ | ​ | ​ | ​ | 778,157 | ​ | ​ | ​ | ​ | ​ | 21% | ​ | ​ | ​ | ​ | ​ | 1,229,790 | ​ | ​ | ​ | ​ | ​ | 1,203,524 | ​ | ​ | ​ | ​ | ​ | 30% | ​ | ​ |
| Equity/Other                           | ​ | ​ | ​                             | ​ | 967,932   | ​                | ​ | ​ | ​ | ​ | 789,336 | ​ | ​ | ​ | ​ | ​ | 21% | ​ | ​ | ​ | ​ | ​ | 641,081 | ​ | ​ | ​ | ​ | ​ | 411,580 | ​ | ​ | ​ | ​ | ​ | 10% | ​ | ​ |
| Total                                  | ​ | ​ | ​                             | $       | 4,009,455 | ​                | ​ | ​ | ​ | $ | 3,727,889 | ​ | ​ | ​ | ​ | ​ | 100% | ​ | ​ | ​ | ​ | $ | 4,357,766 | ​ | ​ | ​ | ​ | $ | 3,996,705 | ​ | ​ | ​ | ​ | ​ | 100% | ​ | ​ |
| ​                                                                                                       | ​ | ​ | September 30, 2018 | ​ | ​ | December 31, 2017 | ​ |
|---------------------------------------------------------------------------------------------------------------|---------|---------|-------------------------|---------|---------|------------------------|---------|
| Number of Portfolio Companies                                                                                 | ​ | ​ | 73                      | ​ | ​ | 76                     | ​ |
| % Variable Rate (based on fair value)                                                                         | ​ | ​ | 37.4%                   | ​ | ​ | 40.1%                  | ​ |
| % Fixed Rate (based on fair value)                                                                            | ​ | ​ | 41.4%                   | ​ | ​ | 49.6%                  | ​ |
| % Income Producing Equity/Other Investments (based on fair value)                                             | ​ | ​ | 10.5%                   | ​ | ​ | 0.7%                   | ​ |
| % Non-Income Producing Equity/Other Investments (based on fair value)                                    | ​ | ​ | 10.7%                   | ​ | ​ | 9.6%                   | ​ |
| Average Annual EBITDA of Portfolio Companies                                                                  | ​ | ​ | $163,922                | ​ | ​ | $188,168               | ​ |
| Weighted Average Purchase Price of Debt Investments (as a % of par value)                                     | ​ | ​ | 97.9%                   | ​ | ​ | 97.0%                  | ​ |
| % of Investments on Non-Accrual (based on fair value)                                                         | ​ | ​ | 3.1%                    | ​ | ​ | 2.6%                   | ​ |
| Gross Portfolio Yield Prior to Leverage (based on amortized cost)                                             | ​ | ​ | 8.1%                    | ​ | ​ | 8.0%                   | ​ |
| Gross Portfolio Yield Prior to Leverage (based on amortized cost)—Excluding Non-Income Producing Assets | ​ | ​ | 10.2%                   | ​ | ​ | 9.8%                   | ​ |

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| New Direct Originations                            | ​ | ​ | For the Three Months Ended September 30, 2018 | ​ | ​  | For the Nine Months Ended September 30, 2018 | ​ |
|----------------------------------------------------|---------|---------|----------------------------------------------------|---------|----------|---------------------------------------------------|---------|
| Total Commitments (including unfunded commitments) | ​ | ​ | ​                                            | $       | 134,881  | ​                                           | ​ | ​ | ​ | $ | 624,980 | ​ | ​ |
| Exited Investments (including partial paydowns)    | ​ | ​ | ​                                            | ​ | (63,183) | ​                                           | ​ | ​ | ​ | ​ | (234,362) | ​ | ​ |
| Net Direct Originations                            | ​ | ​ | ​                                            | $       | 71,698   | ​                                           | ​ | ​ | ​ | $ | 390,618 | ​ | ​ |
| ​                                            |
| ​                                                                 | ​ | ​ | For the Three Months Ended September 30, 2018 | ​ | ​ | For the Nine Months Ended September 30, 2018 | ​ |
|-------------------------------------------------------------------------|---------|---------|----------------------------------------------------|---------|---------|---------------------------------------------------|---------|
| New Direct Originations by Asset Class (including Unfunded Commitments) | ​ | ​ | Commitment Amount                                  | ​ | ​ | Percentage                                        | ​ | ​ | Commitment Amount | ​ | ​ | Percentage | ​ |
| Senior Secured Loans—First Lien                                   | ​ | ​ | ​                                            | $       | 50,758  | ​                                           | ​ | ​ | ​ | ​ | 38% | ​ | ​ | ​ | ​ | $ | 179,973 | ​ | ​ | ​ | ​ | ​ | 29% | ​ | ​ |
| Senior Secured Loans—Second Lien                                  | ​ | ​ | ​                                            | ​ | 84,123  | ​                                           | ​ | ​ | ​ | ​ | 62% | ​ | ​ | ​ | ​ | ​ | 92,690 | ​ | ​ | ​ | ​ | ​ | 15% | ​ | ​ |
| Senior Secured Bonds                                                    | ​ | ​ | ​                                            | ​ | — | ​                                           | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Subordinated Debt                                                       | ​ | ​ | ​                                            | ​ | — | ​                                           | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 13,636 | ​ | ​ | ​ | ​ | ​ | 2% | ​ | ​ |
| Equity/Other                                                            | ​ | ​ | ​                                            | ​ | — | ​                                           | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 338,681 | ​ | ​ | ​ | ​ | ​ | 54% | ​ | ​ |
| Total                                                                   | ​ | ​ | ​                                            | $       | 134,881 | ​                                           | ​ | ​ | ​ | ​ | 100% | ​ | ​ | ​ | ​ | $ | 624,980 | ​ | ​ | ​ | ​ | ​ | 100% | ​ | ​ |
| ​                                                                 |
| ​                                                                                                                                                   | ​ | ​ | For the Three Months Ended September 30, 2018 | ​ | ​ | For the Nine Months Ended September 30, 2018 | ​ |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------|---------|---------|----------------------------------------------------|---------|---------|---------------------------------------------------|---------|
| Average New Direct Origination Commitment Amount                                                                                                          | ​ | ​ | $26,976                                            | ​ | ​ | $28,233                                           | ​ |
| Weighted Average Maturity for New Direct Originations                                                                                                     | ​ | ​ | 4/7/23                                             | ​ | ​ | 1/18/24                                           | ​ |
| Gross Portfolio Yield Prior to Leverage (based on amortized cost) of Direct Originations Funded during Period                                             | ​ | ​ | 11.6%                                              | ​ | ​ | 11.2%                                             | ​ |
| Gross Portfolio Yield Prior to Leverage (based on amortized cost) of Direct Originations Funded during Period—Excluding Non-Income Producing Assets | ​ | ​ | 11.6%                                              | ​ | ​ | 11.3%                                             | ​ |
| Gross Portfolio Yield Prior to Leverage (based on amortized cost) of Direct Originations Exited during Period                                             | ​ | ​ | 10.1%                                              | ​ | ​ | 10.4%                                             | ​ |
| Characteristics of All Direct Originations held in Portfolio                                                                                | ​ | ​ | September 30, 2018 | ​ | ​ | December 31, 2017 | ​ |
|---------------------------------------------------------------------------------------------------------------------------------------------|---------|---------|-------------------------|---------|---------|------------------------|---------|
| Number of Portfolio Companies                                                                                                               | ​ | ​ | 46                      | ​ | ​ | 36                     | ​ |
| Average Annual EBITDA of Portfolio Companies                                                                                                | ​ | ​ | $102,348                | ​ | ​ | $77,664                | ​ |
| Average Leverage Through Tranche of Portfolio Companies—Excluding Equity/Other Securities                                             | ​ | ​ | 6.3x                    | ​ | ​ | 5.7x                   | ​ |
| % of Investments on Non-Accrual (based on fair value)                                                                                       | ​ | ​ | 4.4%                    | ​ | ​ | 2.6%                   | ​ |
| Gross Portfolio Yield Prior to Leverage (based on amortized cost) of Funded Direct Originations                                             | ​ | ​ | 8.0%                    | ​ | ​ | 7.4%                   | ​ |
| Gross Portfolio Yield Prior to Leverage (based on amortized cost) of Funded Direct Originations—Excluding Non-Income Producing Assets | ​ | ​ | 10.8%                   | ​ | ​ | 9.8%                   | ​ |

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| ​                           | ​ | ​ | September 30, 2018 | ​ | ​   | December 31, 2017  | ​ |
|-----------------------------------|---------|---------|-------------------------|---------|-----------|-------------------------|---------|
| Portfolio Composition by Strategy | ​ | ​ | Fair Value              | ​ | ​   | Percentage of Portfolio | ​ | ​ | Fair Value | ​ | ​ | Percentage of Portfolio | ​ |
| Direct Originations               | ​ | ​ | ​                 | $       | 2,668,324 | ​                 | ​ | ​ | ​ | ​ | 72% | ​ | ​ | ​ | ​ | $ | 2,277,397 | ​ | ​ | ​ | ​ | ​ | 57% | ​ | ​ |
| Broadly Syndicated/Other          | ​ | ​ | ​                 | ​ | 1,059,565 | ​                 | ​ | ​ | ​ | ​ | 28% | ​ | ​ | ​ | ​ | ​ | 1,719,308 | ​ | ​ | ​ | ​ | ​ | 43% | ​ | ​ |
| Total                             | ​ | ​ | ​                 | $       | 3,727,889 | ​                 | ​ | ​ | ​ | ​ | 100% | ​ | ​ | ​ | ​ | $ | 3,996,705 | ​ | ​ | ​ | ​ | ​ | 100% | ​ | ​ |
| ​                           |
| Investment Rating | ​ | ​ | Summary Description                                                                                                                                            | ​ |
|-------------------|---------|---------|----------------------------------------------------------------------------------------------------------------------------------------------------------------|---------|
| 1                 | ​ | ​ | Investment exceeding expectations and/or capital gain expected.                                                                                                | ​ |
| 2                 | ​ | ​ | Performing investment generally executing in accordance with the portfolio company’s business plan—full return of principal and interest expected. | ​ |
| 3                 | ​ | ​ | Performing investment requiring closer monitoring.                                                                                                             | ​ |
| 4                 | ​ | ​ | Underperforming investment—some loss of interest or dividend possible, but still expecting a positive return on investment.                              | ​ |
| 5                 | ​ | ​ | Underperforming investment with expected loss of interest and some principal.                                                                                  | ​ |
| ​           | ​ | ​ | September 30, 2018 | ​ | ​   | December 31, 2017  | ​ |
|-------------------|---------|---------|-------------------------|---------|-----------|-------------------------|---------|
| Investment Rating | ​ | ​ | Fair Value              | ​ | ​   | Percentage of Portfolio | ​ | ​ | Fair Value | ​ | ​ | Percentage of Portfolio | ​ |
| 1                 | ​ | ​ | ​                 | $       | —   | ​                 | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | $ | 99,205 | ​ | ​ | ​ | ​ | ​ | 2% | ​ | ​ |
| 2                 | ​ | ​ | ​                 | ​ | 3,367,936 | ​                 | ​ | ​ | ​ | ​ | 90% | ​ | ​ | ​ | ​ | ​ | 3,125,386 | ​ | ​ | ​ | ​ | ​ | 78% | ​ | ​ |
| 3                 | ​ | ​ | ​                 | ​ | 169,587   | ​                 | ​ | ​ | ​ | ​ | 5% | ​ | ​ | ​ | ​ | ​ | 546,153 | ​ | ​ | ​ | ​ | ​ | 14% | ​ | ​ |
| 4                 | ​ | ​ | ​                 | ​ | —   | ​                 | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| 5                 | ​ | ​ | ​                 | ​ | 190,366   | ​                 | ​ | ​ | ​ | ​ | 5% | ​ | ​ | ​ | ​ | ​ | 225,961 | ​ | ​ | ​ | ​ | ​ | 6% | ​ | ​ |
| Total             | ​ | ​ | ​                 | $       | 3,727,889 | ​                 | ​ | ​ | ​ | ​ | 100% | ​ | ​ | ​ | ​ | $ | 3,996,705 | ​ | ​ | ​ | ​ | ​ | 100% | ​ | ​ |
| ​           |

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| ​                      | ​ | ​ | Three Months Ended September 30, | ​ | ​ | Nine Months Ended September 30, | ​ |
|------------------------------|---------|---------|---------------------------------------|---------|---------|--------------------------------------|---------|
| ​                      | ​ | ​ | 2018                                  | ​ | ​ | 2017                                 | ​ | ​ | 2018 | ​ | ​ | 2017 | ​ |
| ​                      | ​ | ​ | Amount                                | ​ | ​ | Percentage of Total Income           | ​ | ​ | Amount | ​ | ​ | Percentage of Total Income | ​ | ​ | Amount | ​ | ​ | Percentage of Total Income | ​ | ​ | Amount | ​ | ​ | Percentage of Total Income | ​ |
| Interest income              | ​ | ​ | ​                               | $       | 75,707  | ​                              | ​ | ​ | ​ | ​ | 94% | ​ | ​ | ​ | ​ | $ | 84,676 | ​ | ​ | ​ | ​ | ​ | 84% | ​ | ​ | ​ | ​ | $ | 228,841 | ​ | ​ | ​ | ​ | ​ | 92% | ​ | ​ | ​ | ​ | $ | 255,464 | ​ | ​ | ​ | ​ | ​ | 80% | ​ | ​ |
| Paid-in-kind interest income | ​ | ​ | ​                               | ​ | 2,510   | ​                              | ​ | ​ | ​ | ​ | 3% | ​ | ​ | ​ | ​ | ​ | 9,339 | ​ | ​ | ​ | ​ | ​ | 9% | ​ | ​ | ​ | ​ | ​ | 7,455 | ​ | ​ | ​ | ​ | ​ | 3% | ​ | ​ | ​ | ​ | ​ | 26,418 | ​ | ​ | ​ | ​ | ​ | 8% | ​ | ​ |
| Fee income                   | ​ | ​ | ​                               | ​ | 1,974   | ​                              | ​ | ​ | ​ | ​ | 3% | ​ | ​ | ​ | ​ | ​ | 7,056 | ​ | ​ | ​ | ​ | ​ | 7% | ​ | ​ | ​ | ​ | ​ | 11,940 | ​ | ​ | ​ | ​ | ​ | 5% | ​ | ​ | ​ | ​ | ​ | 38,075 | ​ | ​ | ​ | ​ | ​ | 12% | ​ | ​ |
| Dividend Income              | ​ | ​ | ​                               | ​ | 150     | ​                              | ​ | ​ | ​ | ​ | 0% | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 150 | ​ | ​ | ​ | ​ | ​ | 0% | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Total investment income(1)   | ​ | ​ | ​                               | $       | 80,341  | ​                              | ​ | ​ | ​ | ​ | 100% | ​ | ​ | ​ | ​ | $ | 101,071 | ​ | ​ | ​ | ​ | ​ | 100% | ​ | ​ | ​ | ​ | $ | 248,386 | ​ | ​ | ​ | ​ | ​ | 100% | ​ | ​ | ​ | ​ | $ | 319,957 | ​ | ​ | ​ | ​ | ​ | 100% | ​ | ​ |
| ​                      |
| ​                                                         | ​ | ​ | Three Months Ended September 30, | ​ | ​ | Nine Months Ended September 30, | ​ |
|-----------------------------------------------------------------|---------|---------|---------------------------------------|---------|---------|--------------------------------------|---------|
| ​                                                         | ​ | ​ | 2018                                  | ​ | ​ | 2017                                 | ​ | ​ | 2018 | ​ | ​ | 2017 | ​ |
| Management fees                                                 | ​ | ​ | ​                               | $       | 16,977  | ​                              | ​ | ​ | ​ | $ | 22,031 | ​ | ​ | ​ | ​ | $ | 52,393 | ​ | ​ | ​ | ​ | $ | 67,104 | ​ | ​ |
| Subordinated income incentive fees                              | ​ | ​ | ​                               | ​ | — | ​                              | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 10,499 | ​ | ​ |
| Administrative services expenses                                | ​ | ​ | ​                               | ​ | 1,211   | ​                              | ​ | ​ | ​ | ​ | 611 | ​ | ​ | ​ | ​ | ​ | 2,806 | ​ | ​ | ​ | ​ | ​ | 2,218 | ​ | ​ |
| Share transfer agent fees                                       | ​ | ​ | ​                               | ​ | 658     | ​                              | ​ | ​ | ​ | ​ | 658 | ​ | ​ | ​ | ​ | ​ | 1,951 | ​ | ​ | ​ | ​ | ​ | 2,066 | ​ | ​ |
| Accounting and administrative fees                              | ​ | ​ | ​                               | ​ | 312     | ​                              | ​ | ​ | ​ | ​ | 384 | ​ | ​ | ​ | ​ | ​ | 1,012 | ​ | ​ | ​ | ​ | ​ | 1,216 | ​ | ​ |
| Interest expense                                                | ​ | ​ | ​                               | ​ | 17,714  | ​                              | ​ | ​ | ​ | ​ | 13,648 | ​ | ​ | ​ | ​ | ​ | 45,983 | ​ | ​ | ​ | ​ | ​ | 35,454 | ​ | ​ |
| Trustees’ fees                                            | ​ | ​ | ​                               | ​ | 187     | ​                              | ​ | ​ | ​ | ​ | 244 | ​ | ​ | ​ | ​ | ​ | 821 | ​ | ​ | ​ | ​ | ​ | 744 | ​ | ​ |
| Expenses associated with our independent audit and related fees | ​ | ​ | ​                               | ​ | 131     | ​                              | ​ | ​ | ​ | ​ | 132 | ​ | ​ | ​ | ​ | ​ | 340 | ​ | ​ | ​ | ​ | ​ | 393 | ​ | ​ |
| Legal fees                                                      | ​ | ​ | ​                               | ​ | 174     | ​                              | ​ | ​ | ​ | ​ | 74 | ​ | ​ | ​ | ​ | ​ | 538 | ​ | ​ | ​ | ​ | ​ | 202 | ​ | ​ |
| Printing fees                                                   | ​ | ​ | ​                               | ​ | 205     | ​                              | ​ | ​ | ​ | ​ | 305 | ​ | ​ | ​ | ​ | ​ | 749 | ​ | ​ | ​ | ​ | ​ | 1,212 | ​ | ​ |
| Other                                                           | ​ | ​ | ​                               | ​ | 1,446   | ​                              | ​ | ​ | ​ | ​ | 52 | ​ | ​ | ​ | ​ | ​ | 2,162 | ​ | ​ | ​ | ​ | ​ | 865 | ​ | ​ |
| Total operating expenses                                        | ​ | ​ | ​                               | ​ | 39,015  | ​                              | ​ | ​ | ​ | ​ | 38,139 | ​ | ​ | ​ | ​ | ​ | 108,755 | ​ | ​ | ​ | ​ | ​ | 121,973 | ​ | ​ |
| Less: Expense reimbursement from sponsor                        | ​ | ​ | ​                               | ​ | — | ​                              | ​ | ​ | ​ | ​ | (7,095) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (25,315) | ​ | ​ |
| Plus: Expense recoupement due to sponsor                        | ​ | ​ | ​                               | ​ | — | ​                              | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 2,858 | ​ | ​ |
| Net operating expenses                                          | ​ | ​ | ​                               | $       | 39,015  | ​                              | ​ | ​ | ​ | $ | 31,044 | ​ | ​ | ​ | ​ | $ | 108,755 | ​ | ​ | ​ | ​ | $ | 99,516 | ​ | ​ |
| ​                                                         |

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| ​                                                                           | ​ | ​ | Three Months Ended September 30, | ​ | ​ | Nine Months Ended September 30, | ​ |
|-----------------------------------------------------------------------------------|---------|---------|---------------------------------------|---------|---------|--------------------------------------|---------|
| ​                                                                           | ​ | ​ | 2018                                  | ​ | ​ | 2017                                 | ​ | ​ | 2018 | ​ | ​ | 2017 | ​ |
| Ratio of operating expenses to average net assets                                 | ​ | ​ | ​                               | ​ | 1.34%   | ​                              | ​ | ​ | ​ | ​ | 1.21% | ​ | ​ | ​ | ​ | ​ | 3.75% | ​ | ​ | ​ | ​ | ​ | 3.71% | ​ | ​ |
| Ratio of expense reimbursement to (from) sponsor to average net assets            | ​ | ​ | ​                               | ​ | — | ​                              | ​ | ​ | ​ | ​ | (0.23)% | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (0.69)% | ​ | ​ |
| Ratio of net operating expenses to average net assets                             | ​ | ​ | ​                               | ​ | 1.34%   | ​                              | ​ | ​ | ​ | ​ | 0.98% | ​ | ​ | ​ | ​ | ​ | 3.75% | ​ | ​ | ​ | ​ | ​ | 3.02% | ​ | ​ |
| Ratio of income incentive fees and interest expense to average net assets(1)      | ​ | ​ | ​                               | ​ | (0.61)% | ​                              | ​ | ​ | ​ | ​ | (0.43)% | ​ | ​ | ​ | ​ | ​ | (1.58)% | ​ | ​ | ​ | ​ | ​ | (1.40)% | ​ | ​ |
| Ratio of net operating expenses to average net assets, excluding certain expenses | ​ | ​ | ​                               | ​ | 0.73%   | ​                              | ​ | ​ | ​ | ​ | 0.55% | ​ | ​ | ​ | ​ | ​ | 2.17% | ​ | ​ | ​ | ​ | ​ | 1.62% | ​ | ​ |
| ​                                                                           |
| ​                                      | ​ | ​ | Three Months Ended September 30, | ​ | ​ | Nine Months Ended September 30, | ​ |
|----------------------------------------------|---------|---------|---------------------------------------|---------|---------|--------------------------------------|---------|
| ​                                      | ​ | ​ | 2018                                  | ​ | ​ | 2017                                 | ​ | ​ | 2018 | ​ | ​ | 2017 | ​ |
| Net realized gain (loss) on investments(1)   | ​ | ​ | ​                               | $       | (5,694) | ​                              | ​ | ​ | ​ | $ | 6,211 | ​ | ​ | ​ | ​ | $ | (84,138) | ​ | ​ | ​ | ​ | $ | (70,244) | ​ | ​ |
| Net realized gain (loss) on foreign currency | ​ | ​ | ​                               | ​ | — | ​                              | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 1 | ​ | ​ |
| Total net realized gain (loss)               | ​ | ​ | ​                               | $       | (5,694) | ​                              | ​ | ​ | ​ | $ | 6,211 | ​ | ​ | ​ | ​ | $ | (84,138) | ​ | ​ | ​ | ​ | $ | (70,243) | ​ | ​ |
| ​                                      |

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| ​                                                                  | ​ | ​ | Three Months Ended September 30, | ​ | ​ | Nine Months Ended September 30, |
|--------------------------------------------------------------------------|---------|---------|---------------------------------------|---------|---------|--------------------------------------|
| ​                                                                  | ​ | ​ | 2018                                  | ​ | ​ | 2017                                 | ​ | ​ | 2018 | ​ | ​ | 2017 |
| Net change in unrealized appreciation (depreciation) on investments      | ​ | ​ | ​                               | $       | 51,662  | ​                              | ​ | ​ | ​ | $ | (7,263) | ​ | ​ | ​ | ​ | $ | 79,495 | ​ | ​ | ​ | ​ | $ | (168,614) |
| Net change in unrealized appreciation (depreciation) on foreign currency | ​ | ​ | ​                               | ​ | 1       | ​                              | ​ | ​ | ​ | ​ | (1) | ​ | ​ | ​ | ​ | ​ | 21 | ​ | ​ | ​ | ​ | ​ | 51 |
| Total net change in unrealized appreciation (depreciation)               | ​ | ​ | ​                               | $       | 51,663  | ​                              | ​ | ​ | ​ | $ | (7,264) | ​ | ​ | ​ | ​ | $ | 79,516 | ​ | ​ | ​ | ​ | $ | (168,563) |
| ​                                                                  |

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| Arrangement(1)          | ​ | ​ | Type of Arrangement | ​ | ​ | Rate    | ​ | ​ | Amount Outstanding | ​ | ​   | Amount Available | ​ | ​ | Maturity Date | ​ |
|-------------------------|---------|---------|---------------------|---------|---------|---------|---------|---------|--------------------|---------|-----------|------------------|---------|---------|---------------|---------|
| Goldman Facility        | ​ | ​ | Term                | ​ | ​ | L+3.72% | ​ | ​ | ​            | $       | 425,000   | ​          | ​ | ​ | ​       | $       | — | ​ | ​ | ​ | September 15, 2019 | ​ |
| JPMorgan Facility       | ​ | ​ | Revolving/Term      | ​ | ​ | L+2.75% | ​ | ​ | ​            | ​ | 206,667   | ​          | ​ | ​ | ​       | ​ | 413,333 | ​ | ​ | ​ | February 16, 2023 | ​ |
| Senior Secured Notes(2) | ​ | ​ | Bond                | ​ | ​ | 7.50%   | ​ | ​ | ​            | ​ | 500,000   | ​          | ​ | ​ | ​       | ​ | — | ​ | ​ | ​ | August 15, 2023 | ​ |
| Total                   | ​ | ​ | ​             | ​ | ​ | ​ | ​ | ​ | ​            | $       | 1,131,667 | ​          | ​ | ​ | ​       | $       | 413,333 | ​ | ​ | ​ | ​ | ​ |
| ​                 |

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| ​                    | ​ | ​ | Distribution | ​ |
|----------------------------|---------|---------|--------------|---------|
| For the Three Months Ended | ​ | ​ | Per Share    | ​ | ​ | Amount | ​ |
| Fiscal 2017                | ​ | ​ | ​      | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| March 31, 2017        | ​ | ​ | ​      | $       | 0.17713 | ​ | ​ | ​ | ​ | $ | 77,984 | ​ | ​ |
| June 30, 2017         | ​ | ​ | ​      | ​ | 0.17713 | ​ | ​ | ​ | ​ | ​ | 78,374 | ​ | ​ |
| September 30, 2017    | ​ | ​ | ​      | ​ | 0.17713 | ​ | ​ | ​ | ​ | ​ | 78,115 | ​ | ​ |
| Total                      | ​ | ​ | ​      | $       | 0.53138 | ​ | ​ | ​ | ​ | $ | 234,473 | ​ | ​ |
| Fiscal 2018                | ​ | ​ | ​      | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| March 31, 2018        | ​ | ​ | ​      | $       | 0.12500 | ​ | ​ | ​ | ​ | $ | 54,823 | ​ | ​ |
| June 30, 2018         | ​ | ​ | ​      | ​ | 0.12500 | ​ | ​ | ​ | ​ | ​ | 54,811 | ​ | ​ |
| September 30, 2018    | ​ | ​ | ​      | ​ | 0.12500 | ​ | ​ | ​ | ​ | ​ | 54,724 | ​ | ​ |
| Total                      | ​ | ​ | ​      | $       | 0.37500 | ​ | ​ | ​ | ​ | $ | 164,358 | ​ | ​ |
| ​                    |

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| ​                 | ​ | ​ | ​                 | ​ | ​ | Payments Due By Period | ​ |
|-------------------------|---------|---------|-------------------------|---------|---------|------------------------|---------|
| ​                 | ​ | ​ | Maturity Date(1)        | ​ | ​ | Total                  | ​ | ​ | Less than 1 year | ​ | ​ | 1–3 years | ​ | ​ | 3–5 years | ​ | ​ | More than 5 years | ​ |
| Goldman Facility(2)     | ​ | ​ | September 15, 2019 | ​ | ​ | ​                | $       | 425,000 | ​ | ​ | ​ | ​ | $ | 425,000 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| JPMorgan Facility(3)    | ​ | ​ | February 16, 2023  | ​ | ​ | ​                | $       | 206,667 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | $ | 206,667 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Senior Secured Notes(2) | ​ | ​ | August 15, 2023    | ​ | ​ | ​                | $       | 500,000 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | $ | 500,000 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |

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| Basis Point Change in Interest Rates | ​ | ​ | Increase (Decrease) in Interest Income | ​ | ​  | Increase (Decrease) in Interest Expense | ​ | ​ | Increase (Decrease) in Net Interest Income | ​ | ​ | Percentage Change in Net Interest Income | ​ |
|--------------------------------------|---------|---------|----------------------------------------|---------|----------|-----------------------------------------|---------|---------|--------------------------------------------|---------|---------|------------------------------------------|---------|
| Down 100 basis points                | ​ | ​ | ​                                | $       | (13,204) | ​                                 | ​ | ​ | ​                                    | $       | (6,056) | ​                                  | ​ | ​ | ​ | $ | (7,148) | ​ | ​ | ​ | ​ | ​ | (2.8)% | ​ | ​ |
| No change                            | ​ | ​ | ​                                | ​ | —  | ​                                 | ​ | ​ | ​                                    | ​ | — | ​                                  | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Up 100 basis points                  | ​ | ​ | ​                                | $       | 12,877   | ​                                 | ​ | ​ | ​                                    | $       | 5,767   | ​                                  | ​ | ​ | ​ | $ | 7,110 | ​ | ​ | ​ | ​ | ​ | 2.8% | ​ | ​ |
| Up 300 basis points                  | ​ | ​ | ​                                | $       | 38,630   | ​                                 | ​ | ​ | ​                                    | $       | 17,302  | ​                                  | ​ | ​ | ​ | $ | 21,328 | ​ | ​ | ​ | ​ | ​ | 8.5% | ​ | ​ |
| Up 500 basis points                  | ​ | ​ | ​                                | $       | 64,383   | ​                                 | ​ | ​ | ​                                    | $       | 28,836  | ​                                  | ​ | ​ | ​ | $ | 35,547 | ​ | ​ | ​ | ​ | ​ | 14.1% | ​ | ​ |

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| Period                                            | ​ | ​ | Total Number of Shares Purchased | ​ | ​   | Average Price Paid per Share | ​ | ​ | Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs | ​ | ​ | Maximum Number of Shares that May Yet Be Purchased Under the Plans or Programs | ​ |
|---------------------------------------------------|---------|---------|----------------------------------|---------|-----------|------------------------------|---------|---------|----------------------------------------------------------------------------------|---------|---------|--------------------------------------------------------------------------------|---------|
| July 1, 2018 to July 31, 2018           | ​ | ​ | ​                          | ​ | 5,214,091 | ​                      | ​ | ​ | ​                                                                          | $       | 6.60    | ​                                                                        | ​ | ​ | ​ | ​ | 5,214,091 | ​ | ​ | ​ | ​ | ​ | (1) | ​ | ​ |
| August 1, 2018 to August 31, 2018       | ​ | ​ | ​                          | ​ | —   | ​                      | ​ | ​ | ​                                                                          | ​ | — | ​                                                                        | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| September 1, 2018 to September 30, 2018 | ​ | ​ | ​                          | ​ | —   | ​                      | ​ | ​ | ​                                                                          | ​ | — | ​                                                                        | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Total                                             | ​ | ​ | ​                          | ​ | 5,214,091 | ​                      | ​ | ​ | ​                                                                          | $       | 6.60    | ​                                                                        | ​ | ​ | ​ | ​ | 5,214,091 | ​ | ​ | ​ | ​ | ​ | (1) | ​ | ​ |
| ​                                           |

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| ​ | 3.1  | ​ | ​ | Third Amended and Restated Declaration of Trust of FS Energy and Power Fund. (Incorporated by reference to Exhibit 3.1 to FS Energy and Power Fund’s Quarterly Report on Form 10-Q filed on August 10, 2017.)                                                                                                                                                                           | ​ |
|---------|------|---------|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------|
| ​ | 3.2  | ​ | ​ | Amendment No. 1 to the Third Amended and Restated Declaration of Trust of FS Energy and Power Fund. (Incorporated by reference to Exhibit 3.2 to FS Energy and Power Fund’s Quarterly Report on Form 10-Q filed on August 10, 2017.)                                                                                                                                                    | ​ |
| ​ | 3.3  | ​ | ​ | Second Amended and Restated Bylaws of FS Energy and Power Fund. (Incorporated by reference to Exhibit 3.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on June 1, 2017.)                                                                                                                                                                                              | ​ |
| ​ | 4.1  | ​ | ​ | Second Amended and Restated Distribution Reinvestment Plan of FS Energy and Power Fund. (Incorporated by reference to Exhibit 4.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on October 17, 2016.)                                                                                                                                                             | ​ |
| ​ | 10.1 | ​ | ​ | Investment Advisory and Administrative Services Agreement, dated as of April 9, 2018, by and between FS Energy and Power Fund and FS/EIG Advisor, LLC (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on April 9, 2018.)                                                                                                 | ​ |
| ​ | 10.2 | ​ | ​ | Investment Advisory and Administrative Services Agreement, dated as of April 28, 2011, by and between FS Energy and Power Fund and FS Investment Advisor, LLC. (Incorporated by reference to Exhibit (g)(1) filed with Amendment No. 3 to FS Energy and Power Fund’s registration statement on Form N-2 (File No. 333-169679) filed on May 6, 2011.)                                    | ​ |
| ​ | 10.3 | ​ | ​ | Amendment No. 1 dated as of August 10, 2012, to Investment Advisory and Administrative Services Agreement, dated as of April 28, 2011, by and between FS Energy and Power Fund and FS Investment Advisor, LLC. (Incorporated by reference to Exhibit 10.2 to FS Energy and Power Fund’s Quarterly Report on Form 10-Q filed on August 14, 2012.)                              | ​ |
| ​ | 10.4 | ​ | ​ | Investment Sub-advisory Agreement, dated as of April 28, 2011, by and between FS Investment Advisor, LLC and GSO Capital Partners LP. (Incorporated by reference to Exhibit (g)(2) filed with Amendment No. 3 to FS Energy and Power Fund’s registration statement on Form N-2 (File No. 333-169679) filed on May 6, 2011.)                                                        | ​ |
| ​ | 10.5 | ​ | ​ | Custodian Agreement, dated as of November 14, 2011, by and between State Street Bank and Trust Company and FS Energy and Power Fund. (Incorporated by reference to Exhibit 10.6 to FS Energy and Power Fund’s Quarterly Report on Form 10-Q filed on November 14, 2011.)                                                                                                      | ​ |
| ​ | 10.6 | ​ | ​ | Escrow Agreement, dated as of March 29, 2011, by and between FS Energy and Power Fund and UMB Bank, N.A. (Incorporated by reference to Exhibit (k) filed with Amendment No. 3 to FS Energy and Power Fund’s registration statement on Form N-2 (File No. 333-169679) filed on May 6, 2011.)                                                                              | ​ |
| ​ | 10.7 | ​ | ​ | Amended and Restated Credit Agreement, dated as of June 11, 2014, by and among FSEP Term Funding, LLC and Deutsche Bank AG, New York Branch. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on June 17, 2014.)                                                                                                          | ​ |
| ​ | 10.8 | ​ | ​ | First Amendment to Amended and Restated Credit Agreement, dated as of June 11, 2015, by and among FSEP Term Funding, LLC and Deutsche Bank AG, New York Branch (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on June 15, 2015.)                                                                                        | ​ |
| ​ | 10.9 | ​ | ​ | Second Amendment to Amended and Restated Credit Agreement, dated as of June 10, 2016, by and among FSEP Term Funding, LLC, as borrower, Deutsche Bank AG, New York Branch, as administrative agent and a lender, and the other lenders party thereto. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on June 16, 2016.) | ​ |

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| ​ | 10.10 | ​ | ​ | Third Amendment to Amended and Restated Credit Agreement, dated as of June 9, 2017, by and among FSEP Term Funding, LLC, as borrower, Deutsche Bank AG, New York Branch, as administrative agent and a lender, and the other lenders party thereto. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on June 14, 2017.)   | ​ |
|---------|-------|---------|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------|
| ​ | 10.11 | ​ | ​ | Fourth Amendment to Amended and Restated Credit Agreement, dated as of June 11, 2018, by and among FSEP Term Funding, LLC, as borrower, Deutsche Bank AG, New York Branch, as administrative agent and a lender, and the other lenders party thereto. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on June 15, 2018.) | ​ |
| ​ | 10.12 | ​ | ​ | Asset Contribution Agreement, dated as of June 24, 2011, by and between FS Energy and Power Fund and FSEP Term Funding, LLC. (Incorporated by reference to Exhibit 10.8 to FS Energy and Power Fund’s Quarterly Report on Form 10-Q filed on June 27, 2011.)                                                                                                                       | ​ |
| ​ | 10.13 | ​ | ​ | Investment Management Agreement, dated as of June 24, 2011, by and between FS Energy and Power Fund and FSEP Term Funding, LLC. (Incorporated by reference to Exhibit 10.9 to FS Energy and Power Fund’s Quarterly Report on Form 10-Q filed on June 27, 2011.)                                                                                                                    | ​ |
| ​ | 10.14 | ​ | ​ | Security Agreement, dated as of June 24, 2011, by and between FSEP Term Funding, LLC and Deutsche Bank AG, New York Branch. (Incorporated by reference to Exhibit 10.10 to FS Energy and Power Fund’s Quarterly Report on Form 10-Q filed on June 27, 2011.)                                                                                                                       | ​ |
| ​ | 10.15 | ​ | ​ | Termination and Release Acknowledgment, dated as of May 11, 2012, by Citibank N.A. in favor of FS Energy and Power Fund. (Incorporated by reference to Exhibit 10.15 to FS Energy and Power Fund’s Quarterly Report on Form 10-Q filed on May 15, 2012.)                                                                                                                           | ​ |
| ​ | 10.16 | ​ | ​ | Termination Acknowledgment (TRS), dated as of May 24, 2013, by and between EP Investments LLC and Citibank, N.A. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on May 31, 2013.)                                                                                                                                       | ​ |
| ​ | 10.17 | ​ | ​ | Loan Agreement, dated as of May 24, 2013, by and among EP Funding LLC, the financial institutions and other lenders from time to time party thereto and Citibank, N.A., as administrative agent. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on May 29, 2013.)                                                       | ​ |
| ​ | 10.18 | ​ | ​ | Account Control Agreement, dated as of May 24, 2013, by and among EP Funding LLC, Citibank, N.A. and Virtus Group, LP. (Incorporated by reference to Exhibit 10.2 to FS Energy and Power Fund’s Current Report on Form 8-K filed on May 29, 2013.)                                                                                                                                 | ​ |
| ​ | 10.19 | ​ | ​ | Security Agreement, dated as of May 24, 2013, by and between EP Funding LLC and Citibank, N.A. (Incorporated by reference to Exhibit 10.3 to FS Energy and Power Fund’s Current Report on Form 8-K filed on May 29, 2013.)                                                                                                                                                         | ​ |
| ​ | 10.20 | ​ | ​ | Investment Management Agreement, dated as of May 24, 2013, by and between FS Energy and Power Fund and EP Funding LLC. (Incorporated by reference to Exhibit 10.4 to FS Energy and Power Fund’s Current Report on Form 8-K filed on May 29, 2013.)                                                                                                                                 | ​ |
| ​ | 10.21 | ​ | ​ | Credit Agreement, dated as of July 11, 2013, by and among Energy Funding LLC, Natixis, New York Branch, Wells Fargo Bank, National Association and the other lenders from time to time party thereto. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on July 16, 2013.)                                                 | ​ |
| ​ | 10.22 | ​ | ​ | Securities Account Control Agreement, dated as of July 11, 2013, by and among Energy Funding LLC and Wells Fargo Bank, National Association. (Incorporated by reference to Exhibit 10.2 to FS Energy and Power Fund’s Current Report on Form 8-K filed on July 16, 2013.)                                                                                                          | ​ |
| ​ | 10.23 | ​ | ​ | Collateral Management Agreement, dated as of July 11, 2013, by and between FS Energy and Power Fund and Energy Funding LLC. (Incorporated by reference to Exhibit 10.3 to FS Energy and Power Fund’s Current Report on Form 8-K filed on July 16, 2013.)                                                                                                                           | ​ |

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| ​ | 10.24 | ​ | ​ | Amended and Restated Expense Support and Conditional Reimbursement Agreement, dated May 16, 2013, by and between FS Energy and Power Fund and Franklin Square Holdings, L.P. (Incorporated by reference to Exhibit 99.1 to FS Energy and Power Fund’s Current report on Form 8-K filed on May 17, 2013.)                                                                                                                                                                           | ​ |
|---------|-------|---------|---------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------|
| ​ | 10.25 | ​ | ​ | Expense Support and Conditional Reimbursement Agreement, dated as of April 9, 2018, by and between FS Energy and Power Fund and FS/EIG Advisor, LLC. (Incorporated by reference to Exhibit 10.24 to FS Energy and Power Fund’s Form 10-Q filed on May 14, 2018.)                                                                                                                                                                                                                        | ​ |
| ​ | 10.26 | ​ | ​ | Committed Facility Agreement, dated as of December 11, 2013, by and between Berwyn Funding LLC and BNP Paribas Prime Brokerage, Inc. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on December 17, 2013.)                                                                                                                                                                                                                   | ​ |
| ​ | 10.27 | ​ | ​ | First Amendment Agreement, dated as of August 18, 2014, between BNP Paribas Prime Brokerage, Inc., on behalf of itself and as agent for the BNPP Entities, and Berwyn Funding LLC. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on August 21, 2014.)                                                                                                                                                                  | ​ |
| ​ | 10.28 | ​ | ​ | Fifth Amendment to the Committed Facility Agreement, dated as of May 4, 2016 by and between Berwyn Funding LLC and BNP Paribas Prime Brokerage, Inc. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on May 10, 2016.)                                                                                                                                                                                                        | ​ |
| ​ | 10.29 | ​ | ​ | U.S. PB Agreement, dated as of December 11, 2013, by and between Berwyn Funding LLC and BNP Paribas Prime Brokerage, Inc. (Incorporated by reference to Exhibit 10.2 to FS Energy and Power Fund’s Current Report on Form 8-K filed on December 17, 2013.)                                                                                                                                                                                                                              | ​ |
| ​ | 10.30 | ​ | ​ | First Amendment to the U.S. PB Agreement, dated as of May 4, 2016, by and between Berwyn Funding LLC and BNP Paribas Prime Brokerage, Inc. (Incorporated by reference to Exhibit 10.2 to FS Energy and Power Fund’s Current Report on Form 8-K filed on May 10, 2016.)                                                                                                                                                                                                                  | ​ |
| ​ | 10.31 | ​ | ​ | Special Custody and Pledge Agreement, dated as of December 11, 2013, by and among State Street Bank and Trust Company, Berwyn Funding LLC and BNP Paribas Prime Brokerage, Inc. (Incorporated by reference to Exhibit 10.3 to FS Energy and Power Fund’s Current Report on Form 8-K filed on December 17, 2013.)                                                                                                                                                                   | ​ |
| ​ | 10.32 | ​ | ​ | Investment Management Agreement, dated as of December 11, 2013, by and between FS Energy and Power Fund and Berwyn Funding LLC. (Incorporated by reference to Exhibit 10.4 to FS Energy and Power Fund’s Current Report on Form 8-K filed on December 17, 2013.)                                                                                                                                                                                                                        | ​ |
| ​ | 10.33 | ​ | ​ | Loan and Servicing Agreement, dated as of September 9, 2014, among Wayne Funding LLC, as borrower, Wells Fargo Securities, LLC, as administrative agent, Wells Fargo Bank, National Association, as collateral agent, account bank and collateral custodian, and the other lenders and lender agents from time to time party thereto. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on September 15, 2014.)                 | ​ |
| ​ | 10.34 | ​ | ​ | First Amendment to the Loan and Servicing Agreement, dated as of October 13, 2016, among Wayne Funding LLC, as Borrower, Wells Fargo Securities, LLC, as Administrative Agent, Wells Fargo Bank, National Association, as institutional lender, and Wells Fargo Bank, National Association, as collateral agent, account bank and collateral custodian. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on October 14, 2016.) | ​ |
| ​ | 10.35 | ​ | ​ | Purchase and Sale Agreement, dated as of September 9, 2014, by and between Wayne Funding LLC, as purchaser, and FS Energy and Power Fund, as seller. (Incorporated by reference to Exhibit 10.2 to FS Energy and Power Fund’s Current Report on Form 8-K filed on September 15, 2014.)                                                                                                                                                                                                  | ​ |
| ​ | 10.36 | ​ | ​ | Collateral Management Agreement, dated as of September 9, 2014, by and between Wayne Funding LLC and FS Energy and Power Fund, as collateral manager. (Incorporated by reference to Exhibit 10.3 to FS Energy and Power Fund’s Current Report on Form 8-K filed on September 15, 2014.)                                                                                                                                                                                                 | ​ |

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| ​ | 10.37 | ​ | ​ | Securities Account Control Agreement, dated as of September 9, 2014, by and among Wayne Funding LLC, as pledgor, Wells Fargo Bank, National Association, as collateral agent, and Wells Fargo Bank, National Association, as securities intermediary. (Incorporated by reference to Exhibit 10.4 to FS Energy and Power Fund’s Current Report on Form 8-K filed on September 15, 2014.)       | ​ |
|---------|-------|---------|---------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------|
| ​ | 10.38 | ​ | ​ | Amended and Restated Sale and Contribution Agreement, dated as of September 11, 2014, by and between FS Energy and Power Fund and Gladwyne Funding LLC. (Incorporated by reference to Exhibit 10.5 to FS Energy and Power Fund’s Current Report on Form 8-K filed on September 15, 2014.)                                                                                                     | ​ |
| ​ | 10.39 | ​ | ​ | Indenture, dated as of September 11, 2014, by and between Gladwyne Funding LLC and Citibank, N.A., as trustee. (Incorporated by reference to Exhibit 10.6 to FS Energy and Power Fund’s Current Report on Form 8-K filed on September 15, 2014.)                                                                                                                                              | ​ |
| ​ | 10.40 | ​ | ​ | First Supplemental Indenture, dated as of December 15, 2014, by and between Gladwyne Funding LLC and Citibank, N.A., as trustee. (Incorporated by reference to Exhibit 10.1 of FS Energy and Power Fund’s Current Report on Form 8-K filed on December 19, 2014.)                                                                                                                             | ​ |
| ​ | 10.41 | ​ | ​ | Second Supplemental Indenture, dated as of September 21, 2016, by and between Gladwyne Funding LLC and Citibank, N.A., as trustee. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on September 22, 2016.)                                                                                                                          | ​ |
| ​ | 10.42 | ​ | ​ | Gladwyne Funding LLC Floating Rate Notes due 2024. (Incorporated by reference to Exhibit 10.7 to FS Energy and Power Fund’s Current Report on Form 8-K filed on September 15, 2014.)                                                                                                                                                                                                               | ​ |
| ​ | 10.43 | ​ | ​ | Amended and Restated September 1996 Version Master Repurchase Agreement between Goldman Sachs Bank USA and Strafford Funding LLC, dated as of September 21, 2016. (Incorporated by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K filed on September 22, 2016.)                                                                                                | ​ |
| ​ | 10.44 | ​ | ​ | Second Amended and Restated Master Confirmation, dated as of September 21, 2016, by and between Goldman Sachs Bank USA and Strafford Funding LLC. (Incorporated by reference to Exhibit 10.56 of FS Energy and Power Fund’s Quarterly Report on Form 10-Q filed on November 9, 2016.)                                                                                                         | ​ |
| ​ | 10.45 | ​ | ​ | Amended and Restated Revolving Credit Agreement, dated as of December 15, 2014, by and between FS Energy and Power Fund and Strafford Funding LLC. (Incorporated by reference to Exhibit 10.3 of FS Energy and Power Fund’s Current Report on Form 8-K filed on December 19, 2014.)                                                                                                           | ​ |
| ​ | 10.46 | ​ | ​ | Amended and Restated Investment Management Agreement, dated as of September 11, 2014, by and between Gladwyne Funding LLC and FS Energy and Power Fund. (Incorporated by reference to Exhibit 10.10 to FS Energy and Power Fund’s Current Report on Form 8-K filed on September 15, 2014.)                                                                                                    | ​ |
| ​ | 10.47 | ​ | ​ | Collateral Administration Agreement, dated as of September 11, 2014, by and among Gladwyne Funding LLC, FS Energy and Power Fund and Virtus Group, LP. (Incorporated by reference to Exhibit 10.11 to FS Energy and Power Fund’s Current Report on Form 8-K filed on September 15, 2014.)                                                                                                     | ​ |
| ​ | 10.48 | ​ | ​ | Term Loan and Security Agreement, dated as of November 6, 2015, by and among Foxfields Funding LLC, Fortress Credit Co LLC, as administrative agent, the lenders from time to time party thereto and the other loan parties from time to time party thereto. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on November 12, 2015.) | ​ |
| ​ | 10.49 | ​ | ​ | Contribution Agreement, dated as of November 6, 2015, by and between FS Energy and Power Fund and Foxfields Funding LLC. (Incorporated by reference to Exhibit 10.2 to FS Energy and Power Fund’s Current Report on Form 8-K filed on November 12, 2015.)                                                                                                                                     | ​ |

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| ​ | 10.50 | ​ | ​ | Investment Management Agreement, dated as of November 6, 2015, by and between FS Energy and Power Fund and Foxfields Funding LLC. (Incorporated by reference to Exhibit 10.3 to FS Energy and Power Fund’s Current Report on Form 8-K filed on November 12, 2015.)                                                                                                                               | ​ |
|---------|-------|---------|---------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------|
| ​ | 10.51 | ​ | ​ | Securities Account Control Agreement, dated as of November 6, 2015, by and among Foxfields Funding LLC, Fortress Credit Co LLC, as administrative agent and State Street Bank and Trust Company. (Incorporated by reference to Exhibit 10.4 to FS Energy and Power Fund’s Current Report on Form 8-K filed on November 12, 2015.)                                                                | ​ |
| ​ | 10.52 | ​ | ​ | Guaranty, dated as of November 6, 2015, by and between FS Energy and Power Fund and Fortress Credit Co LLC. (Incorporated by reference to Exhibit 10.5 to FS Energy and Power Fund’s Current Report on Form 8-K filed on November 12, 2015.)                                                                                                                                                     | ​ |
| ​ | 10.53 | ​ | ​ | Pledge Agreement, dated as of November 6, 2015, by and between FS Energy and Power Fund and Fortress Credit Co LLC. (Incorporated by reference to Exhibit 10.6 to FS Energy and Power Fund’s Current Report on Form 8-K filed on November 12, 2015.)                                                                                                                                             | ​ |
| ​ | 10.54 | ​ | ​ | First Amendment to Term Loan and Security Agreement, dated as of November 25, 2015, by and among Foxfields Funding LLC, Fortress Credit Co LLC, as administrative agent, the lenders signatory thereto. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on December 1, 2015.)                                                          | ​ |
| ​ | 10.55 | ​ | ​ | Consent and Third Amendment to Term Loan and Security Agreement, dated as of March 16, 2018, among Foxfields Funding LLC, as borrower, Fortress Credit Co LLC, as administrative agent, and the lenders party thereto. (Incorporated by reference to Exhibit 10.2 to FS Energy and Power Fund’s Current Report on Form 8-K filed on March 19, 2018.)                                             | ​ |
| ​ | 10.56 | ​ | ​ | Senior Secured Revolving Credit Agreement, dated as of May 18, 2016, by and among Bryn Mawr Funding LLC, Barclays Bank PLC, as administrative agent, and the lenders from time to time party thereto. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on May 24, 2016.)                                                                | ​ |
| ​ | 10.57 | ​ | ​ | Contribution Agreement, dated as of May 18, 2016, by and between FS Energy and Power Fund and Bryn Mawr Funding LLC. (Incorporated by reference to Exhibit 10.2 to FS Energy and Power Fund’s Current Report on Form 8-K filed on May 24, 2016.)                                                                                                                                                 | ​ |
| ​ | 10.58 | ​ | ​ | Investment Management Agreement, dated as of May 18, 2016, by and between FS Energy and Power Fund and Bryn Mawr Funding LLC. (Incorporated by reference to Exhibit 10.3 to FS Energy and Power Fund’s Current Report on Form 8-K filed on May 24, 2016.)                                                                                                                                        | ​ |
| ​ | 10.59 | ​ | ​ | Control Agreement, dated as of May 18, 2016, by and among Bryn Mawr Funding LLC, Barclays Bank PLC, as collateral agent, and State Street Bank and Trust Company, as custodian. (Incorporated by reference to Exhibit 10.4 to FS Energy and Power Fund’s Current Report on Form 8-K filed on May 24, 2016.)                                                                                 | ​ |
| ​ | 10.60 | ​ | ​ | Guaranty, dated as of May 18, 2016, by and between FS Energy and Power Fund and Barclays Bank PLC, as collateral agent. (Incorporated by reference to Exhibit 10.5 to FS Energy and Power Fund’s Current Report on Form 8-K filed on May 24, 2016.)                                                                                                                                              | ​ |
| ​ | 10.61 | ​ | ​ | Pledge Agreement, dated as of May 18, 2016, by and between FS Energy and Power Fund and Barclays Bank PLC, as collateral agent. (Incorporated by reference to Exhibit 10.6 to FS Energy and Power Fund’s Current Report on Form 8-K filed on May 24, 2016.)                                                                                                                                      | ​ |
| ​ | 10.62 | ​ | ​ | Guarantee, Pledge and Security Agreement, dated as of May 18, 2016, by and among Bryn Mawr Funding LLC, any subsidiary guarantors from time to time party thereto, Barclays Bank PLC, as revolving administrative agent, and Barclays Bank PLC, as collateral agent. (Incorporated by reference to Exhibit 10.7 to FS Energy and Power Fund’s Current Report on Form 8-K filed on May 24, 2016.) | ​ |

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| ​ | 10.63 | ​ | ​ | First Amendment to Senior Secured Revolving Credit Agreement, dated as of March 14, 2018, among Bryn Mawr Funding, LLC, the lenders party thereto, Barclays Bank PLC, as administrative agent, and FS Energy and Power Fund. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on March 19, 2018.)                                                                                                                                                               | ​ |
|---------|-------|---------|---------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------|
| ​ | 10.64 | ​ | ​ | Credit Agreement, dated as of April 19, 2017, among Gladwyne Funding LLC, Goldman Sachs Bank USA, as lender, sole lead arranger and administrative agent, Citibank, N.A., as collateral agent, and Virtus Group, LP, as collateral administrator. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on April 25, 2017.)                                                                                                                                          | ​ |
| ​ | 10.65 | ​ | ​ | Indenture, dated August 16, 2018, by and between FS Energy and Power Fund, U.S. Bank National Association, as trustee, and the guarantors named therein. (Incorporated by reference to Exhibit 4.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on August 22, 2018.)                                                                                                                                                                                                                         | ​ |
| ​ | 10.66 | ​ | ​ | Senior Secured Credit Agreement, dated August 16, 2018, by and among FS Energy and Power Fund, the Lenders party thereto, JPMorgan Chase Bank, N.A., as administrative agent and collateral agent and the other parties signatory thereto. (Incorporated by reference to Exhibit 10.1 to FS Energy and Power Fund’s Current Report on Form 8-K filed on August 22, 2018.)                                                                                                                                                | ​ |
| ​ | 10.67 | ​ | ​ | Guarantee and Security Agreement, dated August 16, 2018, made by FS Energy and Power Fund and certain of FS Energy and Power Fund’s subsidiaries in favor of JPMorgan Chase Bank, N.A. as collateral agent. (Incorporated by reference to Exhibit 10.2 to FS Energy and Power Fund’s Current Report on Form 8-K filed on August 22, 2018.)                                                                                                                                                                    | ​ |
| ​ | 10.68 | ​ | ​ | Collateral Agency and Intercreditor Agreement, dated August 16, 2018, by and among FS Energy and Power Fund, FS Energy and Power Fund’s subsidiaries parties thereto, JPMorgan Chase Bank, N.A., as the initial credit facility representative, U.S. Bank National Association as the initial secured notes representative and JPMorgan Chase Bank, N.A., as collateral agent. (Incorporated by reference to Exhibit 10.3 to FS Energy and Power Fund’s Current Report on Form 8-K filed on August 22, 2018.) | ​ |
| ​ | 31.1* | ​ | ​ | Certification of Chief Executive Officer pursuant to Rule 13a-14 under the Securities Exchange Act of 1934, as amended.                                                                                                                                                                                                                                                                                                                                                                                                                  | ​ |
| ​ | 31.2* | ​ | ​ | Certification of Chief Financial Officer pursuant to Rule 13a-14 under the Securities Exchange Act of 1934, as amended.                                                                                                                                                                                                                                                                                                                                                                                                                  | ​ |
| ​ | 32.1* | ​ | ​ | Certification of Chief Executive Officer and Chief Financial Officer pursuant to Section 1350, Chapter 63 of Title 18, United States Code, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.                                                                                                                                                                                                                                                                                                                    | ​ |

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| ​ | ​ | ​ | ​ | FS Energy and Power Fund | ​ |
|---------|---------|---------|---------|--------------------------|---------|
| ​ | ​ | ​ | ​ | By:                      | ​ | ​ | /s/ MICHAEL C. FORMAN​Michael C. FormanChief Executive Officer (Principal Executive Officer) | ​ |
| ​ | ​ | ​ | ​ | By:                      | ​ | ​ | /s/ EDWARD T. GALLIVAN, JR.​Edward T. Gallivan, Jr.Chief Financial Officer (Principal Financial and Accounting Officer) | ​ |

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