Putnam Mortgage Securities Fund

02/05/2026 | Press release | Distributed by Public on 02/05/2026 15:03

Prospectus Certification by Investment Company (Form 497J)

ROPES & GRAY LLP

PRUDENTIAL TOWER

800 BOYLSTON STREET

BOSTON, MA 02199-3600

WWW.ROPESGRAY.COM

February 5, 2026

Timothy F. Cormier

T +1 617 951 7747

[email protected]

VIA EDGAR

Securities and Exchange Commission

100 F Street, NE

Washington, DC 20549

Re:

Putnam Mortgage Securities Fund (the "Registrant")

(Registration Nos. 2-87634 and 811-03897)

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended (the "Securities Act"), the undersigned has been authorized by the Registrant to submit this filing in lieu of a filing under Rule 497(c) under the Securities Act, and to certify (a) that the forms of prospectus and statement of additional information used with respect to the Registrant do not differ from those contained in Post-Effective Amendment No. 61 to the Registrant's Registration Statement ("Amendment No. 61"), and (b) that Amendment No. 61 was filed electronically.

Any questions or comments regarding this matter should be directed to the undersigned at (617) 951-7747.

Very truly yours,

 /s/ Timothy F. Cormier   
Timothy F. Cormier
cc:

Venice Monagan, Esq., Franklin Templeton

Tara Gormel, Esq., Franklin Templeton

Putnam Mortgage Securities Fund published this content on February 05, 2026, and is solely responsible for the information contained herein. Distributed via EDGAR on February 05, 2026 at 21:03 UTC. If you believe the information included in the content is inaccurate or outdated and requires editing or removal, please contact us at [email protected]