JOHN HANCOCK FINANCIAL OPPORTUNITIES FUND

Prospectus Supplement

John Hancock Financial Opportunities Fund (the fund)

Supplement dated August 29, 2025 to the current Prospectus, as may be supplemented (the Prospectus)

The following replaces any references, contained either in the Prospectus or the Prospectus Supplement, with respect to the fund’s: (i) last reported sale price; (ii) net asset value (“NAV”) per Common Share; and (iii) percentage premium to NAV per Common Share.

The last reported sale price, NAV per share and percentage premium to NAV per share of the Common Shares as of August 27, 2025 were $37.44, $36.73, and 1.93%, respectively.

You should read this supplement in conjunction with the Prospectus and retain it for your future reference.

Manulife, Manulife Investments, Stylized M Design, and Manulife Investments & Stylized M Design are trademarks of The Manufacturers Life Insurance Company and John Hancock, and the Stylized John Hancock Design are trademarks of John Hancock Life Insurance Company (U.S.A.). Each are used by it and by its affiliates under license.

SEC Form 424B3 filed by John Hancock Financial Opportunities Fund