245 Summer Street

Fidelity® Investments

Boston, MA 02210

June 30, 2023

U.S. Securities & Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Attention: File Room

RE: Fidelity Summer Street Trust (the trust): File Nos. 002-58542 and 811-02737 Fidelity Capital & Income Fund Fidelity Focused High Income Fund Fidelity Global High Income Fund Fidelity Healthy Future Fund Fidelity High Income Fund Fidelity SAI High Income Fund Fidelity Series High Income Fund Fidelity Short Duration High Income Fund Fidelity U.S. Low Volatility Equity Fund Fidelity Women's Leadership Fund (the fund(s))

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Ladies and Gentlemen:

Transmitted herewith pursuant to Rule 497(j) under the Securities Act of 1933 is certification that the Prospectus(es) and Statement(s) of Additional Information with respect to the above referenced fund(s) do not differ from those filed in the most recent post-effective amendment, which was filed electronically.

Very truly yours,

/s/Margaret Carey

Margaret Carey

Secretary of the Trust