Form 8-K BAR HARBOR BANKSHARES For: Sep 15

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

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FORM 8-K

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CURRENT REPORT

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PURSUANT TO SECTION 13 OR 15(D) OF
THE SECURITIES EXCHANGE ACT OF 1934

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Date of Report (Date of earliest event reported): September 15, 2026

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BAR HARBOR BANKSHARES

(Exact Name of Registrant as Specified in its Charter)

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Registrant’s telephone number, including area code: (207) 288-3314

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Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

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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 (see General Instruction A.2. below):

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☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

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☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

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☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

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☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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

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Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

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Emerging growth company  ☐

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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. ☐

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Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

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On September 15, 2026, John M. Mercier, Executive Vice President and Chief Lending Officer of Bar Harbor Bankshares (the “Company”) and Bar Harbor Bank & Trust (the “Bank”), notified the Board of Directors of the Company and the Bank of his intent to retire effective December 31, 2026 (the “Retirement Date”).  Mr. Mercier will continue in his role as Executive Vice President and Chief Lending Officer until the Retirement Date.

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SIGNATURES

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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.

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