NUVEEN SELECT TAX FREE INCOME PORTFOLIO (NXP) Form 424B3 — Oct 2, 2026

Nuveen Select Tax-Free Income Portfolio (NYSE: NXP) filed a prospectus supplement dated October 2, 2026, amending the Use of Proceeds section of its June 17, 2026 prospectus supplement. The updated language states the Fund expects to invest substantially all net proceeds from Common Share issuances in line with its investment objective within approximately three months, with pending proceeds held in U.S. Government securities or high-quality short-term money market instruments. Notably, the Fund may also use proceeds to pay distributions to shareholders.

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