Fidelity Colchester Street Trust

06/01/2026 | Press release | Distributed by Public on 06/01/2026 09:55

Prospectus Certification by Investment Company (Form 497J)

245 Summer Street

Fidelity® Investments

Boston, MA 02210

June 1, 2026

U.S. Securities & Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Attention: File Room

RE:

Fidelity Colchester Street Trust (the trust): File Nos. 002-74808 and 811-03320

Government Portfolio

Money Market Portfolio

Tax-Exempt Portfolio

Treasury Only Portfolio

Treasury Portfolio

(the fund(s))

________________________________________________________________________

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/Nicole Macarchuk

Nicole Macarchuk

Secretary of the Trust

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