# EDGAR Filing Document

**Accession Number:** 0001508655
**File Stem:** 0001193125-26-276036
**Filing Date:** 2026-6
**Character Count:** 5613
**Document Hash:** be3711106e9ba6d62778223ade9783ef
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-276036.hdr.sgml**: 20260618

**ACCESSION NUMBER**: 0001193125-26-276036

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 11

**CONFORMED PERIOD OF REPORT**: 20260618

**ITEM INFORMATION**: Submission of Matters to a Vote of Security Holders

**FILED AS OF DATE**: 20260618

**DATE AS OF CHANGE**: 20260618

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Sixth Street Specialty Lending, Inc.
- **CENTRAL INDEX KEY:** 0001508655

**ORGANIZATION NAME:**
- **EIN:** 273380000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36364
- **FILM NUMBER:** 261103691

**BUSINESS ADDRESS:**
- **STREET 1:** 2100 MCKINNEY AVENUE, SUITE 1500
- **CITY:** DALLAS
- **STATE:** TX
- **ZIP:** 75201
- **BUSINESS PHONE:** 469-621-3001

**MAIL ADDRESS:**
- **STREET 1:** 2100 MCKINNEY AVENUE, SUITE 1500
- **CITY:** DALLAS
- **STATE:** TX
- **ZIP:** 75201

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** TPG Specialty Lending, Inc.
- **DATE OF NAME CHANGE:** 20101222

?xml version='1.0' encoding='ASCII'? 8-K

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

### FORM 8-K

#### CURRENT REPORT

#### Pursuant to Section 13 or 15(d)

#### of the Securities Exchange Act of 1934

#### Date of Report (Date of earliest event reported): June 18, 2026

## Sixth Street Specialty Lending, Inc.

#### (Exact name of registrant as specified in charter)

---

| | | |
|:---|:---|:---|
| **Delaware** | **001-36364** | **27-3380000** |
| **(State or Other Jurisdiction**<br> **of Incorporation)** | **(Commission**<br> **File Number)** | **(I.R.S. Employer**<br> **Identification No.)** |

---

---

| | |
|:---|:---|
| **2100 McKinney Avenue, Suite 1500**<br> **Dallas, TX** | **75201** |
| **(Address of Principal Executive Offices)** | **(zip code)** |

---

#### Registrant's telephone number, including area code: (469) 621-3001
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

#### Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| **Title of each class** | **Trading**<br> **Symbol(s)** | **Name of each exchange**<br> **on which registered** |
| Common Stock, par value $0.01 per share | TSLX | The New York Stock Exchange |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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#### Item 5.07 – Submission of Matters to a Vote of Security Holders

#### Special Meeting of Stockholders
On June 18, 2026, Sixth Street Specialty Lending, Inc. (the "Company") reconvened a special meeting of stockholders. Stockholders considered one proposal as described in the Company's proxy statement filed on April 9, 2026, as amended by the amendment to the Company's proxy statement filed on May 15, 2026. The final results of the voting on the matter submitted to stockholders at the special meeting are set forth below.

**Proposal 1 – Sales of Common Stock Below NAV.** The stockholders approved the proposal to authorize the Company to sell or otherwise issue shares of its common stock at a price below its then-current net asset value per share in one or more offerings, in each case subject to the approval of its board of directors and subject to certain conditions as set forth in the proxy statement (including that the number of shares issued does not exceed 25% of the Company's then-outstanding common stock immediately prior to each such offering), by the vote shown below.

The vote on the proposal, including affiliated and unaffiliated shares, was as follows:

---

| | | | |
|:---|:---|:---|:---|
| **Votes "For"** | **Votes "Against"** | **Abstentions** | **Broker Non-Votes** |
| 41423791 | 6674197 | 1818545 | 0 |

---

The vote on the proposal, adjusted to exclude 3,640,068 affiliated shares, was as follows:

---

| | | | |
|:---|:---|:---|:---|
| **Votes "For"** | **Votes "Against"** | **Abstentions** | **Broker Non-Votes** |
| 38475400 | 6674197 | 1126868 | 0 |

---

------

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | | |
|:---|:---|:---|
|  | SIXTH STREET SPECIALTY LENDING, INC. | SIXTH STREET SPECIALTY LENDING, INC. |
|  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(Registrant) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(Registrant) |
| Date: June 18, 2026 | By: | /s/ Ian Simmonds |
|  | Name: | Ian Simmonds |
|  | Title: | Chief Financial Officer |

---