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Putnam Sustainable Future Fund - Class C Regulatory Documents

Effective August 14, 2026, this fund will be reorganized into Putnam U.S. Research Fund. Effective on or around June 26, 2026, the fund will close to new accounts. Effective July 27, 2026, any front-end sales charges or contingent deferred sales charges will be waived. Effective August 10, 2026, the fund will not accept any additional purchases or exchanges. Refer to the prospectus supplement for more information. Dates are subject to change.