HERITAGE FINANCIAL CORP /WA/

This report does not constitute a solicitation of a proxy, an offer to purchase or a solicitation of an offer to sell any securities. Heritage, Olympic, and certain of their directors, executive officers and other members of management and employees may be deemed to be participants in the solicitation of proxies from the shareholders of Heritage and Olympic in connection with the proposed Merger under SEC rules. Information about the directors and executive officers of Heritage and Olympic is included in the joint proxy statement/prospectus for the proposed transaction. The joint proxy statement/prospectus and other documents relating to the Merger may be obtained free of charge in the manner described above under “Additional Information and Where to Find It.”

Security holders may obtain information regarding the names, affiliations and interests of Heritage's directors and executive officers in the definitive proxy statement of Heritage relating to its 2025 Annual Meeting of Shareholders filed with the SEC on March 21, 2025 and in Heritage’s Annual Report on Form 10-K for the year ended December 31, 2024 filed with the SEC on February 27, 2025. To the extent the holdings of Heritage’s securities by Heritage’s directors and executive officers have changed since the amounts set forth in Heritage’s proxy statement for its 2025 Annual Meeting of Shareholders, such changes have been or will be reflected on Statements of Change in Ownership on Form 4 filed with the SEC. These documents can be obtained free of charge in the manner described above under “Additional Information and Where to Find It.”