UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities and Exchange Act of 1934

Date of Report (Dated of earliest event reported): December 29, 2025

HERITAGE FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter) 

Commission File Number 000-29480

Washington			91-1857900
(State or other jurisdiction of incorporation or organization)			(I.R.S. Employer Identification No.)
201 Fifth Avenue SW,	Olympia	WA	98501
(Address of principal executive offices)			(Zip Code)

(360) 943-1500

(Registrant’s telephone number, including area code)

Not applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☒	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12 (b) of the Act:

Title of each class	Trading symbol	Name of each exchange on which registered
Common stock, no par value	HFWA	The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1934 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging Growth Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 8.01 Other Events

On December 29, 2025, Heritage Financial Corporation (“Heritage”) issued a press release announcing the receipt of regulatory approvals from the Federal Deposit Insurance Corporation and Washington Department of Financial Institutions, as well as non-objection from the Board of Governors of the Federal Reserve System, for the previously announced merger (the “Merger”) of Olympic Bancorp, Inc. ("Olympic") with and into Heritage, as well as for the proposed merger (the "Bank Merger") of Kitsap Bank, the bank subsidiary of Olympic, with and into Heritage Bank, the bank subsidiary of Heritage. All regulatory approvals required for the Merger and the Bank Merger have now been received. Heritage and Olympic intend to close the Merger on or about January 31 2026, subject to the satisfaction of the remaining customary closing conditions, including the receipt of shareholder approval by the shareholders of both Heritage and Olympic.

A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Cautionary Note Regarding Forward-Looking Statements

This report includes “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements often include words such as “believes,” “expects,” “anticipates,” “estimates,” “forecasts,” “intends,” “plans,” “targets,” “potentially,” “probably,” “projects,” “outlook” or similar expressions or future or conditional verbs such as “may,” “will,” “should,” “would,” and “could,” as well as the negative of such words. Forward-looking statements are not historical facts but instead represent management's current expectations and forecasts regarding future events, many of which are inherently uncertain and outside of our control. Actual results may differ, possibly materially, from those currently expected or projected in these forward-looking statements. In addition to factors disclosed in reports filed by Heritage with the SEC, risks and uncertainties for Heritage, Olympic and the combined company that may cause actual results or outcomes to differ materially from those anticipated include, but are not limited to: (1) the possibility that any of the anticipated benefits of the proposed Merger will not be realized or will not be realized within the expected time period; (2) the risk that integration of Olympic’s operations with those of Heritage will be materially delayed or will be more costly or difficult than expected; (3) the parties’ inability to meet expectations regarding the timing of the proposed Merger; (4) changes to tax legislation and their potential effects on the accounting for the Merger; (5) the inability to complete the proposed Merger due to the failure of Olympic’s shareholders to adopt the Agreement and Plan of Merger, dated as of September 25, 2025, by and between Heritage and Olympic, or the failure of Heritage’s shareholders to approve the issuance of Heritage’s common stock in connection with the Merger; (6) the failure to satisfy other conditions to completion of the proposed Merger; (7) the failure of the proposed Merger to close for any other reason; (8) diversion of management’s attention from ongoing business operations and opportunities due to the proposed Merger; (9) the challenges of integrating and retaining key employees; (10) the effect of the announcement of the proposed Merger on Heritage’s, Olympic’s or the combined company’s respective customer and employee relationships and operating results; (11) the possibility that the proposed Merger may be more expensive to complete than anticipated, including as a result of unexpected factors or events; (12) the dilution caused by Heritage’s issuance of additional shares of Heritage’s common stock in connection with the Merger; and (13) changes in the global economy and financial market conditions and the business, results of operations and financial condition of Heritage, Olympic and the combined company. Please refer to each of Heritage’s Annual Report on Form 10-K for the year ended December 31, 2024, as well as Heritage’s other filings with the SEC, for a more detailed discussion of risks, uncertainties and factors that could cause actual results to differ from those discussed in the forward-looking statements.

Any forward-looking statement included in this report is based only on information currently available to management and speaks only as of the date on which it is made. Neither Heritage nor Olympic undertakes any obligation to publicly update any forward-looking statement, whether written or oral, that may be made from time to time, whether as a result of new information, future developments or otherwise.

Additional Information and Where to Find It

Heritage filed a registration statement on Form S-4 with the SEC in connection with the proposed transaction. The registration statement includes a joint proxy statement of Heritage and Olympic that also constitutes a prospectus of Heritage, which was sent to the shareholders of Heritage and Olympic on or about December 12, 2025. Before making any voting decision, the shareholders of Heritage and Olympic are advised to read the joint proxy statement/prospectus because it contains important information about Heritage, Olympic and the proposed transaction. Documents relating to the Merger filed by Heritage can be obtained free of charge from the SEC’s website at www.sec.gov. These documents also can be obtained free of charge by accessing Heritage’s website at hf-wa.com under the tab “Financials.” Alternatively, these documents can be obtained free of charge from Heritage upon written request to Heritage Financial Corporation, Attn: Investor Relations, 201 5th Avenue Southwest, Olympia, Washington 98501, or by calling (360) 943-1550. The contents of the website referenced above are not deemed to be incorporated by reference into the registration statement or the joint proxy statement/prospectus.

Participants in the Solicitation

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.”

Item 9.01 Financial Statements and Exhibits

(d) Exhibits

Exhibit 99.1	Press Release of Heritage Financial Corporation dated December 29, 2025
Exhibit 104	Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

    Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	HERITAGE FINANCIAL CORPORATION
Date:
December 30, 2025	/S/ Bryan D. McDonald
	Bryan D. McDonald
	President and Chief Executive Officer