# EDGAR Filing Document

**Accession Number:** 0000225322
**File Stem:** 0000035402-26-000518
**Filing Date:** 2026-1
**Character Count:** 20312
**Document Hash:** 46c8184322c87c0aa8aabd41a1923fc2
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000035402-26-000518.hdr.sgml**: 20260123

**ACCESSION NUMBER**: 0000035402-26-000518

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251130

**FILED AS OF DATE**: 20260123

**DATE AS OF CHANGE**: 20260123

**PERIOD START**: 20260531

**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:** 26555472

**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:** 2026-05-31

- **b. Date as of which information is reported:** 2025-11-30

**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:** $146291878.15

**Total Liabilities:** $128631.03

**Net Assets:** $146163247.12

**Cash Not Reported:** $251028.87

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000217779 | -0.41%               | -0.10%               | 1.64%                |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $348715.09               | $-885626.81                                |
| Month 2  | $516774.43               | $-622406.10                                |
| Month 3  | $1545197.20              | $558523.82                                 |

### 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   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| ADVANCED DRAIN SYS INC DEL                                                            | ADVANCED DRAINAGE SYSTEMS INC                 | CUSIP: 00790R104<br>LEI: 6QQTOZ5MF5DHM7K92I60 | Long             | EC               | CORP              | US        |     37577 | NS      | $5725983.26   | 3.92%             |  |  |  | No            |                  1 | On Loan: No      |
| AMERICAN WATER WORKS CO INC                                                           | AMERICAN WATER WRKS COMPANY                   | CUSIP: 030420103<br>LEI: 549300DXHIJQMD5WFW18 | Long             | EC               | CORP              | US        |     54908 | NS      | $7141883.56   | 4.89%             |  |  |  | No            |                  1 | On Loan: No      |
| ESSENTIAL UTILITIES INC                                                               | ESSENTIAL UTILITIES INC                       | CUSIP: 29670G102<br>LEI: 549300ILTEOF3E3QY357 | Long             | EC               | CORP              | US        |    221002 | NS      | $8749469.18   | 5.99%             |  |  |  | No            |                  1 | On Loan: No      |
| BADGER METER INC                                                                      | BADGER METER INC                              | CUSIP: 056525108<br>LEI: 5493002JENE20OGTUG20 | Long             | EC               | CORP              | US        |      7369 | NS      | $1315661.26   | 0.90%             |  |  |  | No            |                  1 | On Loan: No      |
| BELIMO HOLDING AG                                                                     | BELIMO HOLDING AG (REG)                       | CUSIP: N/A<br>LEI: 506700339DLX749VEM23       | Long             | EC               | CORP              | CH        |      1221 | NS      | $1194241.69   | 0.82%             |  |  |  | No            |                  1 | On Loan: No      |
| 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        |    303462 | NS      | $8024515.73   | 5.49%             |  |  |  | No            |                  1 | On Loan: No      |
| UNITED UTILS GROUP PLC                                                                | UNITED UTILITIES GROUP PLC                    | CUSIP: N/A<br>LEI: 2138002IEYQAOC88ZJ59       | Long             | EC               | CORP              | GB        |    599302 | NS      | $9813072.17   | 6.71%             |  |  |  | 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      | $2990779.92   | 2.05%             |  |  |  | No            |                  1 | On Loan: No      |
| DOVER CORP                                                                            | DOVER CORP                                    | CUSIP: 260003108<br>LEI: 549300FMC2ALGA7N9E80 | Long             | EC               | CORP              | US        |      9481 | NS      | $1756639.68   | 1.20%             |  |  |  | No            |                  1 | On Loan: No      |
| ECOLAB INC                                                                            | ECOLAB INC                                    | CUSIP: 278865100<br>LEI: 82DYEISM090VG8LTLS26 | Long             | EC               | CORP              | US        |     10560 | NS      | $2905689.60   | 1.99%             |  |  |  | No            |                  1 | On Loan: No      |
| EMERSON ELECTRIC CO                                                                   | EMERSON ELECTRIC CO                           | CUSIP: 291011104<br>LEI: FGLT0EWZSUIRRITFOA30 | Long             | EC               | CORP              | US        |     19544 | NS      | $2606778.72   | 1.78%             |  |  |  | No            |                  1 | On Loan: No      |
| ENERGY RECOVERY INC                                                                   | ENERGY RECOVERY INC                           | CUSIP: 29270J100<br>LEI: 549300ZEQL52Z525WJ22 | Long             | EC               | CORP              | US        |     12397 | NS      | $179136.65    | 0.12%             |  |  |  | No            |                  1 | On Loan: No      |
| Fidelity Revere Street Trust                                                          | Fidelity Cash Central Fund                    | CUSIP: 31635A105<br>LEI: 549300BDV45LJNXBZC55 | Long             | STIV             | RF                | US        |   2941138 | NS      | $2941726.09   | 2.01%             |  |  |  | No            |                  1 | On Loan: No      |
| FISCHER (GEORG) AG                                                                    | FISCHER (GEORG) AG (REG)                      | CUSIP: N/A<br>LEI: 529900CMRQYW4U1W2456       | Long             | EC               | CORP              | CH        |     23262 | NS      | $1536607.02   | 1.05%             |  |  |  | No            |                  1 | On Loan: No      |
| FLOWSERVE CORP                                                                        | FLOWSERVE CORP                                | CUSIP: 34354P105<br>LEI: 6Y0GK87T6V7NJKZJVM41 | Long             | EC               | CORP              | US        |     34444 | NS      | $2457579.40   | 1.68%             |  |  |  | No            |                  1 | On Loan: No      |
| GEBERIT AG                                                                            | GEBERIT AG (REG)                              | CUSIP: N/A<br>LEI: 52990093Z5OHD6T7BS47       | Long             | EC               | CORP              | CH        |      6671 | NS      | $5196585.23   | 3.56%             |  |  |  | No            |                  1 | On Loan: No      |
| INTERPUMP GROUP SPA                                                                   | INTERPUMP GROUP SPA                           | CUSIP: N/A<br>LEI: 815600C79D0F31F4D395       | Long             | EC               | CORP              | IT        |     37397 | NS      | $1900640.07   | 1.30%             |  |  |  | No            |                  1 | On Loan: No      |
| KBR INC                                                                               | KBR INC                                       | CUSIP: 48242W106<br>LEI: 254900OFQDXZRKRCV808 | Long             | EC               | CORP              | US        |     95046 | NS      | $3917796.12   | 2.68%             |  |  |  | No            |                  1 | On Loan: No      |
| KURITA WATER INDUSTRIES LTD                                                           | KURITA WATER INDUSTRIES LTD                   | CUSIP: N/A<br>LEI: 52990086GS2ON69UMX34       | Long             | EC               | CORP              | JP        |     75184 | NS      | $2992342.93   | 2.05%             |  |  |  | No            |                  1 | On Loan: No      |
| MUELLER WTR PRODS INC                                                                 | MUELLER WATER PRODUCTS INC A                  | CUSIP: 624758108<br>LEI: 549300F7ZU4P1F8V8L60 | Long             | EC               | CORP              | US        |     86430 | NS      | $2095063.20   | 1.43%             |  |  |  | No            |                  1 | On Loan: No      |
| COWAY CO LTD                                                                          | COWAY CO LTD                                  | CUSIP: N/A<br>LEI: N/A                        | Long             | EC               | CORP              | KR        |     14997 | NS      | $881298.77    | 0.60%             |  |  |  | No            |                  2 | On Loan: No      |
| ORGANO CORPORATION                                                                    | ORGANO CORPORATION                            | CUSIP: N/A<br>LEI: N/A                        | Long             | EC               | CORP              | JP        |     11799 | NS      | $1008396.98   | 0.69%             |  |  |  | No            |                  1 | On Loan: No      |
| PARKER-HANNIFIN CORP                                                                  | PARKER HANNIFIN CORP                          | CUSIP: 701094104<br>LEI: 5493002CONDB4N2HKI23 | Long             | EC               | CORP              | US        |      1733 | NS      | $1493326.10   | 1.02%             |  |  |  | No            |                  1 | On Loan: No      |
| PENNON GROUP PLC                                                                      | PENNON GROUP PLC                              | CUSIP: N/A<br>LEI: 213800V1CCTS41GWH423       | Long             | EC               | CORP              | GB        |    229120 | NS      | $1672623.07   | 1.14%             |  |  |  | No            |                  1 | On Loan: No      |
| ZURN ELKAY WATER SOLUTIONS CORP                                                       | ZURN ELKAY WATER SOLUTIONS CORP               | CUSIP: 98983L108<br>LEI: 549300AM3633XDFU1Q85 | Long             | EC               | CORP              | US        |     87116 | NS      | $4155433.20   | 2.84%             |  |  |  | No            |                  1 | On Loan: No      |
| SEVERN TRENT PLC                                                                      | SEVERN TRENT PLC                              | CUSIP: N/A<br>LEI: 213800RPBXRETY4A4C59       | Long             | EC               | CORP              | GB        |    271923 | NS      | $10143235.25  | 6.94%             |  |  |  | No            |                  1 | On Loan: No      |
| SULZER AG                                                                             | SULZER AG (REG)                               | CUSIP: N/A<br>LEI: 529900NZ6MAST5IJF669       | Long             | EC               | CORP              | CH        |     10540 | NS      | $1840004.98   | 1.26%             |  |  |  | No            |                  1 | On Loan: No      |
| TETRA TECHNOLOGIES INC DEL                                                            | TETRA TECHNOLOGIES INC                        | CUSIP: 88162F105<br>LEI: 549300T5W131705EK832 | Long             | EC               | CORP              | US        |    131578 | NS      | $1022361.06   | 0.70%             |  |  |  | No            |                  1 | On Loan: No      |
| TETRA TECH INC NEW                                                                    | TETRA TECH INC                                | CUSIP: 88162G103<br>LEI: 549300UJ1LP7JGJC5P32 | Long             | EC               | CORP              | US        |      7534 | NS      | $261731.16    | 0.18%             |  |  |  | No            |                  1 | On Loan: No      |
| VALMONT INDUSTRIES INC                                                                | VALMONT INDUSTRIES INC                        | CUSIP: 920253101<br>LEI: 5493009ZGZJJ8F77JN08 | Long             | EC               | CORP              | US        |      9150 | NS      | $3778675.50   | 2.59%             |  |  |  | No            |                  1 | On Loan: No      |
| VEOLIA ENVIRONNEMENT SA                                                               | VEOLIA ENVIRONNEMENT                          | CUSIP: N/A<br>LEI: 969500LENY69X51OOT31       | Long             | EC               | CORP              | FR        |     79674 | NS      | $2711497.77   | 1.86%             |  |  |  | No            |                  2 | On Loan: No      |
| WATTS WATER TECHNOLOGIES INC                                                          | WATTS WATER TECH INC CL A                     | CUSIP: 942749102<br>LEI: 549300REJOO94ERQN318 | Long             | EC               | CORP              | US        |     25889 | NS      | $7142257.32   | 4.89%             |  |  |  | No            |                  1 | On Loan: No      |
| XYLEM INC                                                                             | XYLEM INC                                     | CUSIP: 98419M100<br>LEI: 549300DF5MV96DRYLQ48 | Long             | EC               | CORP              | US        |     35162 | NS      | $4946238.54   | 3.38%             |  |  |  | No            |                  1 | On Loan: No      |
| ITT INC                                                                               | ITT INC                                       | CUSIP: 45073V108<br>LEI: 549300KDSERHTJOXUS80 | Long             | EC               | CORP              | US        |      8373 | NS      | $1541971.68   | 1.05%             |  |  |  | No            |                  1 | On Loan: No      |
| SELECT WATER SOLUTIONS INC                                                            | SELECT WATER SOLUTIONS INC CL A               | CUSIP: 81617J301<br>LEI: 54930094OK8LA3QDW486 | Long             | EC               | CORP              | US        |     25922 | NS      | $261812.20    | 0.18%             |  |  |  | No            |                  1 | On Loan: No      |
| INGERSOLL RAND INC                                                                    | INGERSOLL RAND INC                            | CUSIP: 45687V106<br>LEI: 5299004C02FMZCUOIR50 | Long             | EC               | CORP              | US        |     60712 | NS      | $4877602.08   | 3.34%             |  |  |  | No            |                  1 | On Loan: No      |
| CIA DE SANEAMENTO DO PARANA SA                                                        | CIA DE SANEAMENTO DO PARANA SA (1CS+4PREF) US | CUSIP: N/A<br>LEI: 254900SZW9X2D21A7X94       | Long             | EC               | CORP              | BR        |     52641 | NS      | $360351.48    | 0.25%             |  |  |  | No            |                  1 | On Loan: No      |
| PENTAIR PLC                                                                           | PENTAIR PLC                                   | CUSIP: N/A<br>LEI: 549300EVR9D56WPSRP15       | Long             | EC               | CORP              | IE        |     81405 | NS      | $8567062.20   | 5.86%             |  |  |  | No            |                  1 | On Loan: No      |
| PARSONS CORP                                                                          | PARSONS CORP                                  | CUSIP: 70202L102<br>LEI: 549300ZXH0VRBSEPX752 | Long             | EC               | CORP              | US        |      4761 | NS      | $403161.48    | 0.28%             |  |  |  | No            |                  1 | On Loan: No      |
| MONTROSE ENVIRONMENTAL GROUP INC                                                      | MONTROSE ENVIRONMENTAL GROUP INC              | CUSIP: 615111101<br>LEI: 254900ASI8K3LUB8Q958 | Long             | EC               | CORP              | US        |     44390 | NS      | $1138603.50   | 0.78%             |  |  |  | No            |                  1 | On Loan: No      |
| CORE and MAIN INC                                                                     | CORE and MAIN INC                             | CUSIP: 21874C102<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    145709 | NS      | $7043573.06   | 4.82%             |  |  |  | No            |                  1 | On Loan: No      |
| VERALTO CORP                                                                          | VERALTO CORP                                  | CUSIP: 92338C103<br>LEI: 635400FJE6GSOJUSNY27 | Long             | EC               | CORP              | US        |     47233 | NS      | $4780924.26   | 3.27%             |  |  |  | No            |                  1 | On Loan: No      |
| WATERBRIDGE INFRASTRUCTURE LLC                                                        | WATERBRIDGE INFRASTRUCTURE LLC                | CUSIP: 940923105<br>LEI: N/A                  | Long             | EC               | CORP              | US        |      1300 | NS      | $29640.00     | 0.02%             |  |  |  | No            |                  1 | On Loan: No      |

### Signature

**Date Signed:** 2025-12-30

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

**Signature:** Stacie M. Smith

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

**Title:** President and Treasurer