HERITAGE FINANCIAL CORP WA

(a) Evaluation of Disclosure Controls and Procedures

An evaluation of the Company’s disclosure controls and procedures (as defined in Section 13a-15(e) or 15d-15(e) of the Exchange Act was carried out under the supervision and with the participation of the Company’s Chief Executive Officer (principal executive officer), Chief Financial Officer (principal financial officer) and the Company’s management as of the end of the period covered by this quarterly report. Based on their evaluation, the Company’s Chief Executive Officer and Chief Financial Officer concluded that the Company’s disclosure controls and procedures as of June 30, 2024 were effective in ensuring that the information required to be disclosed by the Company in the reports it files or submits under the Exchange Act was (i) accumulated and communicated to the Company’s management (including the Chief Executive Officer and Chief Financial Officer) in a timely manner, and (ii) recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.

(b) Changes in Internal Control Over Financial Reporting

There have been no changes in the Company’s internal control over financial reporting (as defined in Rule 13a-15(f) of the Exchange Act) that occurred during the three months ended June 30, 2024, that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.