UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the Fiscal Year Ended December 31, 2023 OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the transition period from _____ to _____ Commission File No. 001-34582 NORTHWEST BANCSHARES, INC. (Exact name of registrant as specified in its charter) Maryland 27-0950358 (State or other jurisdict ...