Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 or HERITAGE FINANCIAL CORPORATION (Exact name of registrant as specified in its charter) Washington 91-1857900 (State or other jurisdiction of incorporation or organization) 201 Fifth Avenue SW, Olympia WA 98501 (Address of principal executive offices) (Zip Code) (I.R.S. Empl ...