# EDGAR Filing Document

**Accession Number:** 0000225322
**File Stem:** 0001752724-25-176774
**Filing Date:** 2025-7
**Character Count:** 17177
**Document Hash:** 1da0367f90eded20a6b96e2fbed64f33
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001752724-25-176774.hdr.sgml**: 20250724

**ACCESSION NUMBER**: 0001752724-25-176774

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250531

**FILED AS OF DATE**: 20250724

**DATE AS OF CHANGE**: 20250724

**PERIOD START**: 20250531

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** FIDELITY SUMMER STREET TRUST
- **CENTRAL INDEX KEY:** 0000225322

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0430

**FILING VALUES:**
- **FORM TYPE:** NPORT-P
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-02737
- **FILM NUMBER:** 251146356

**BUSINESS ADDRESS:**
- **STREET 1:** 245 SUMMER STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
- **BUSINESS PHONE:** 617-563-7000

**MAIL ADDRESS:**
- **STREET 1:** 245 SUMMER STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** FIDELITY HIGH INCOME FUND
- **DATE OF NAME CHANGE:** 19890309

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** FIDELITY AGGRESSIVE INCOME FUND
- **DATE OF NAME CHANGE:** 19810205

## Series and Classes Contracts Data

### Fidelity Water Sustainability Fund (Series ID: S000067937)

| Class ID   | Class Name                         | Ticker Symbol   |
|:---|:---|:---|
| C000217779 | Fidelity Water Sustainability Fund | FLOWX           |

## Form NPORT-P: Monthly Portfolio Investments Report

### NPORT-P: Part A: General Information

**Item A.1. Information about the Registrant.**

- **a. Name of Registrant:** Fidelity Summer Street Trust

- **b. Investment Company Act file number:** 811-02737

- **c. CIK number of Registrant:** 0000225322

- **d. LEI of Registrant:** P1TJ3M056NR1SYX5LY49

- **e. Address and telephone number of Registrant.**

  - **Street Address 1:** 245 Summer Street

  - **City:** Boston

  - **State:** MA

  - **Foreign country:** US

  - **Zip / Postal Code:** 02210

  - **Telephone number:** 1-800-FIDELITY

**Item A.2. Information about the Series.**

- **a. Name of Series:** Fidelity Water Sustainability Fund

- **b. EDGAR series identifier (if any):** S000067937

- **c. LEI of Series:** 5493007YQ3QVFGFYJX14

**Item A.3. Reporting period.**

- **a. Date of fiscal year-end:** 2025-05-31

- **b. Date as of which information is reported:** 2025-05-31

**Item A.4. Final filing**

Does the Fund anticipate that this will be its final filing on Form N-PORT? **No**

### Fund Information

**Total Assets:** $116348578.30

**Total Liabilities:** $126323.77

**Net Assets:** $116222254.53

**Cash Not Reported:** $1562.80

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000217779 | -1.28%               | 5.48%                | 4.41%                |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $776614.03               | $-2094228.25                               |
| Month 2  | $-279404.78              | $5733637.75                                |
| Month 3  | $54545.17                | $4152737.18                                |

### Schedule of Portfolio Investments

| Name                                                                                  | Title                            | Identifiers                                   | Payoff Profile   | Asset Category   | Issuer Category   | Country   |   Balance | Units   | Value (USD)   | % of Net Assets   | Maturity Date   | Coupon Type   | Annualized Rate (%)   | Restricted?   |   Fair Value Level | Lending Status   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| SANEAMENTO BASICO DE SP (CIA) (COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO) | SABESP ON (CIA SANEAM BASICO)    | CUSIP: N/A<br>LEI: 254900UOXRZRS2TNWP19       | Long             | EC               | CORP              | BR        |    200663 | NS      | $4118161.19   | 3.54%             |  |  |  | No            |                  1 | On Loan: No      |
| MONTROSE ENVIRONMENTAL GROUP INC                                                      | MONTROSE ENVIRONMENTAL GROUP INC | CUSIP: 615111101<br>LEI: 254900ASI8K3LUB8Q958 | Long             | EC               | CORP              | US        |     97130 | NS      | $1896948.90   | 1.63%             |  |  |  | No            |                  1 | On Loan: No      |
| VERALTO CORP                                                                          | VERALTO CORP                     | CUSIP: 92338C103<br>LEI: S4BKK9OTCEWQ3YHPFM11 | Long             | EC               | CORP              | US        |     25454 | NS      | $2571617.62   | 2.21%             |  |  |  | No            |                  1 | On Loan: No      |
| DOVER CORP                                                                            | DOVER CORP                       | CUSIP: 260003108<br>LEI: 549300FMC2ALGA7N9E80 | Long             | EC               | CORP              | US        |      9481 | NS      | $1685247.75   | 1.45%             |  |  |  | No            |                  1 | On Loan: No      |
| PENNON GROUP PLC                                                                      | PENNON GROUP PLC                 | CUSIP: N/A<br>LEI: 213800V1CCTS41GWH423       | Long             | EC               | CORP              | GB        |    229120 | NS      | $1578025.40   | 1.36%             |  |  |  | No            |                  2 | On Loan: No      |
| MUELLER WTR PRODS INC                                                                 | MUELLER WATER PRODUCTS INC A     | CUSIP: 624758108<br>LEI: 549300F7ZU4P1F8V8L60 | Long             | EC               | CORP              | US        |     86430 | NS      | $2120127.90   | 1.82%             |  |  |  | No            |                  1 | On Loan: No      |
| ITT INC                                                                               | ITT INC                          | CUSIP: 45073V108<br>LEI: 549300KDSERHTJOXUS80 | Long             | EC               | CORP              | US        |      8373 | NS      | $1260471.42   | 1.08%             |  |  |  | No            |                  1 | On Loan: No      |
| PARSONS CORP                                                                          | PARSONS CORP                     | CUSIP: 70202L102<br>LEI: 549300ZXH0VRBSEPX752 | Long             | EC               | CORP              | US        |      4761 | NS      | $308703.24    | 0.27%             |  |  |  | No            |                  1 | On Loan: No      |
| ORGANO CORPORATION                                                                    | ORGANO CORPORATION               | CUSIP: N/A<br>LEI: N/A                        | Long             | EC               | CORP              | JP        |     11799 | NS      | $637118.94    | 0.55%             |  |  |  | No            |                  1 | On Loan: No      |
| XYLEM INC                                                                             | XYLEM INC                        | CUSIP: 98419M100<br>LEI: 549300DF5MV96DRYLQ48 | Long             | EC               | CORP              | US        |     35162 | NS      | $4431818.48   | 3.81%             |  |  |  | No            |                  1 | On Loan: No      |
| WATTS WATER TECHNOLOGIES INC                                                          | WATTS WATER TECH INC CL A        | CUSIP: 942749102<br>LEI: 549300REJOO94ERQN318 | Long             | EC               | CORP              | US        |     23251 | NS      | $5629532.12   | 4.84%             |  |  |  | No            |                  1 | On Loan: No      |
| ENERGY RECOVERY INC                                                                   | ENERGY RECOVERY INC              | CUSIP: 29270J100<br>LEI: 549300ZEQL52Z525WJ22 | Long             | EC               | CORP              | US        |     12397 | NS      | $156326.17    | 0.13%             |  |  |  | No            |                  1 | On Loan: No      |
| FISCHER (GEORG) AG                                                                    | FISCHER (GEORG) AG (REG)         | CUSIP: N/A<br>LEI: 529900CMRQYW4U1W2456       | Long             | EC               | CORP              | CH        |     23262 | NS      | $1857002.92   | 1.60%             |  |  |  | No            |                  1 | On Loan: No      |
| INGERSOLL RAND INC                                                                    | INGERSOLL RAND INC               | CUSIP: 45687V106<br>LEI: 5299004C02FMZCUOIR50 | Long             | EC               | CORP              | US        |     43179 | NS      | $3525133.56   | 3.03%             |  |  |  | No            |                  1 | On Loan: No      |
| KURITA WATER INDUSTRIES LTD                                                           | KURITA WATER INDUSTRIES LTD      | CUSIP: N/A<br>LEI: 52990086GS2ON69UMX34       | Long             | EC               | CORP              | JP        |     59318 | NS      | $2228933.78   | 1.92%             |  |  |  | No            |                  1 | On Loan: No      |
| AMERICAN WATER WORKS CO INC                                                           | AMERICAN WATER WRKS COMPANY      | CUSIP: 030420103<br>LEI: 549300DXHIJQMD5WFW18 | Long             | EC               | CORP              | US        |     37154 | NS      | $5311907.38   | 4.57%             |  |  |  | No            |                  1 | On Loan: No      |
| EMERSON ELECTRIC CO                                                                   | EMERSON ELECTRIC CO              | CUSIP: 291011104<br>LEI: FGLT0EWZSUIRRITFOA30 | Long             | EC               | CORP              | US        |     19544 | NS      | $2333162.72   | 2.01%             |  |  |  | No            |                  1 | On Loan: No      |
| KBR INC                                                                               | KBR INC                          | CUSIP: 48242W106<br>LEI: 254900OFQDXZRKRCV808 | Long             | EC               | CORP              | US        |     69494 | NS      | $3626891.86   | 3.12%             |  |  |  | No            |                  1 | On Loan: No      |
| CHART INDUSTRIES INC                                                                  | CHART INDUSTRIES INC             | CUSIP: 16115Q308<br>LEI: EM7QGKC1GYOF3LSZSL80 | Long             | EC               | CORP              | US        |     19800 | NS      | $3105828.00   | 2.67%             |  |  |  | No            |                  1 | On Loan: No      |
| UNITED UTILS GROUP PLC                                                                | UNITED UTILITIES GROUP PLC       | CUSIP: N/A<br>LEI: 2138002IEYQAOC88ZJ59       | Long             | EC               | CORP              | GB        |    577310 | NS      | $9140680.63   | 7.86%             |  |  |  | No            |                  2 | On Loan: No      |
| PARKER-HANNIFIN CORP                                                                  | PARKER HANNIFIN CORP             | CUSIP: 701094104<br>LEI: 5493002CONDB4N2HKI23 | Long             | EC               | CORP              | US        |      1733 | NS      | $1151925.10   | 0.99%             |  |  |  | No            |                  1 | On Loan: No      |
| SANEAMENTO BASICO DE SP (CIA) (COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO) | SABESP(CIA SANEAM BASIC)SP ADR   | CUSIP: 20441A102<br>LEI: 254900UOXRZRS2TNWP19 | Long             | EC               | CORP              | BR        |    113416 | NS      | $2329564.64   | 2.00%             |  |  |  | No            |                  1 | On Loan: No      |
| BADGER METER INC                                                                      | BADGER METER INC                 | CUSIP: 056525108<br>LEI: 5493002JENE20OGTUG20 | Long             | EC               | CORP              | US        |      7369 | NS      | $1829133.18   | 1.57%             |  |  |  | No            |                  1 | On Loan: No      |
| GEBERIT AG                                                                            | GEBERIT AG (REG)                 | CUSIP: N/A<br>LEI: 52990093Z5OHD6T7BS47       | Long             | EC               | CORP              | CH        |      6671 | NS      | $4968800.73   | 4.28%             |  |  |  | No            |                  1 | On Loan: No      |
| SEVERN TRENT PLC                                                                      | SEVERN TRENT PLC                 | CUSIP: N/A<br>LEI: 213800RPBXRETY4A4C59       | Long             | EC               | CORP              | GB        |    247775 | NS      | $9023685.60   | 7.76%             |  |  |  | No            |                  1 | On Loan: No      |
| Fidelity Revere Street Trust                                                          | Fidelity Cash Central Fund       | CUSIP: 31635A105<br>LEI: 549300BDV45LJNXBZC55 | Long             | STIV             | RF                | US        |   1579255 | NS      | $1579571.19   | 1.36%             |  |  |  | No            |                  1 | On Loan: No      |
| TETRA TECH INC NEW                                                                    | TETRA TECH INC                   | CUSIP: 88162G103<br>LEI: 549300UJ1LP7JGJC5P32 | Long             | EC               | CORP              | US        |      7534 | NS      | $263237.96    | 0.23%             |  |  |  | No            |                  1 | On Loan: No      |
| ADVANCED DRAIN SYS INC DEL                                                            | ADVANCED DRAINAGE SYSTEMS INC    | CUSIP: 00790R104<br>LEI: 6QQTOZ5MF5DHM7K92I60 | Long             | EC               | CORP              | US        |     37577 | NS      | $4131966.92   | 3.56%             |  |  |  | No            |                  1 | On Loan: No      |
| CRANE CO                                                                              | CRANE CO                         | CUSIP: 224408104<br>LEI: 5493000CQRQOTHUODL75 | Long             | EC               | CORP              | US        |      6817 | NS      | $1168433.80   | 1.01%             |  |  |  | No            |                  1 | On Loan: No      |
| ESSENTIAL UTILITIES INC                                                               | ESSENTIAL UTILITIES INC          | CUSIP: 29670G102<br>LEI: 549300ILTEOF3E3QY357 | Long             | EC               | CORP              | US        |    169329 | NS      | $6524246.37   | 5.61%             |  |  |  | No            |                  1 | On Loan: No      |
| PENTAIR PLC                                                                           | PENTAIR PLC                      | CUSIP: N/A<br>LEI: 549300EVR9D56WPSRP15       | Long             | EC               | CORP              | IE        |     81405 | NS      | $8073747.90   | 6.95%             |  |  |  | No            |                  1 | On Loan: No      |
| ECOLAB INC                                                                            | ECOLAB INC                       | CUSIP: 278865100<br>LEI: 82DYEISM090VG8LTLS26 | Long             | EC               | CORP              | US        |     10560 | NS      | $2804947.20   | 2.41%             |  |  |  | No            |                  1 | On Loan: No      |
| VEOLIA ENVIRONNEMENT SA                                                               | VEOLIA ENVIRONNEMENT             | CUSIP: N/A<br>LEI: 969500LENY69X51OOT31       | Long             | EC               | CORP              | FR        |    169985 | NS      | $5850308.95   | 5.03%             |  |  |  | No            |                  2 | On Loan: No      |
| TETRA TECHNOLOGIES INC DEL                                                            | TETRA TECHNOLOGIES INC           | CUSIP: 88162F105<br>LEI: 549300T5W131705EK832 | Long             | EC               | CORP              | US        |    235376 | NS      | $630807.68    | 0.54%             |  |  |  | No            |                  1 | On Loan: No      |
| INTERPUMP GROUP SPA                                                                   | INTERPUMP GROUP SPA              | CUSIP: N/A<br>LEI: 815600C79D0F31F4D395       | Long             | EC               | CORP              | IT        |     37397 | NS      | $1458159.63   | 1.25%             |  |  |  | No            |                  1 | On Loan: No      |
| CORE and MAIN INC                                                                     | CORE and MAIN INC                | CUSIP: 21874C102<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    118317 | NS      | $6484954.77   | 5.58%             |  |  |  | No            |                  1 | On Loan: No      |

### Signature

**Date Signed:** 2025-06-30

**Name of Applicant:** Stacie M. Smith

**Signature:** Stacie M. Smith

**Name of Signer:** Stacie M. Smith

**Title:** President and Treasurer