X0102 24F-2NT LIVE 0000225322 XXXXXXXX N-1A Fidelity Summer Street Trust 245 Summer Street Boston MA X1 02210 Fidelity SAI Sustainable Sector Fund S000075898 true Fidelity Climate Action Fund S000072128 true Fidelity Sustainable U.S. Equity Fund S000072129 true Fidelity Agricultural Productivity Fund S000067930 true Fidelity SAI Sustainable U.S. Equity Fund S000075899 true Fidelity SAI Sustainable Future Fund S000075897 true Fidelity Water Sustainability Fund S000067937 true 811-02737 002-58542 05/31/2025 false false 742276483 386640273 356165286 742805559 0 (529076) 0.0001531 0 0 0 0 Stacie M. Smith President and Treasurer 05/31/2025