Form 3 Filing for Diane Poillon - Initial Statement of Beneficial Ownership

This filing is an initial statement of beneficial ownership (Form 3) for Diane Poillon, reporting owner CIK 0001945031, related to Burke & Herbert Financial Services Corp. (BHRB). The report is dated May 1, 2026. Diane Poillon is identified as a director of the issuer. The filing indicates that there are no securities owned by the reporting owner, as noted by the 'noSecuritiesOwned' field being set to '1'. The signature on the document is provided by Matthew Rucker, acting as Attorney-in-Fact for Diane Poillon. The address for the reporting owner is listed as 100 SOUTH FAIRFAX STREET, ALEXANDRIA, VA 22314.