Janus Investment Fund

02/02/2026 | Press release | Distributed by Public on 02/02/2026 14:17

Prospectus Certification by Investment Company (Form 497J)

[Janus Henderson Letterhead]

February 2, 2026

EDGAR Operations Branch

Securities and Exchange Commission

Division of Investment Management

100 F Street, N.E.

Washington, D.C. 20549-0505

Re:

JANUS INVESTMENT FUND (the "Registrant")

1933 Act File No. 002-34393

1940 Act File No. 811-01879

Dear Sir or Madam:

Pursuant to Rule 497(j) of Regulation C under the Securities Act of 1933, as amended (the "1933 Act"), the undersigned hereby certifies on behalf of the Registrant:

1. There are no changes to the Prospectuses from the forms of the Prospectuses that were filed in Post-Effective Amendment No. 334 ("PEA No. 334") on January 28, 2026, pursuant to Rule 485(b) under the 1933 Act for each series of the Registrant with a September 30 fiscal year end, and all share classes thereof.

2. The text of PEA No. 334 has been filed electronically.

If you have any questions regarding this filing, please call me at (303) 336-7889.

Respectfully,

/s/ Jay Mensah

Jay Mensah

Assistant Secretary

Enclosure (via EDGAR)

cc:

Thea Kelley

Janus Investment Fund published this content on February 02, 2026, and is solely responsible for the information contained herein. Distributed via EDGAR on February 02, 2026 at 20:17 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 If you believe the information included in the content is inaccurate or outdated and requires editing or removal, please contact us at [email protected]