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Date of Report (Date of earliest event reported): May 7, 2026

(Exact name of registrant as specified in its charter)

(Address of principal executive offices, including zip code)

(Registrant's telephone number, including area code)

(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:

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).

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. ☐

On May 7, 2026, Horizon Bancorp, Inc. (the “Company”) held its Annual Meeting of Shareholders. Only holders of the Company’s common stock at the close of business on March 20, 2026 (the “Record Date”) were entitled to vote at the Annual Meeting. As of the Record Date, there were 51,225,946 shares of common stock entitled to vote. A total of 44,629,953 shares of common stock (87.12%), constituting a quorum, were represented in person or by valid proxies at the Annual Meeting.

The Company’s shareholders voted on three proposals at the annual meeting. The proposals are described in detail in the proxy statement filed by the Company with the Securities and Exchange Commission on March 20, 2026. The final results of the votes regarding each proposal are set forth below.

The Company’s shareholders elected three directors to the Board of Directors to serve for three-year terms until the 2029 annual meeting of shareholders. The votes regarding this proposal were as follows:

The Company’s shareholders voted to approve the compensation of the Company’s named executive officers, as disclosed in the proxy statement. The votes regarding this proposal were as follows:

The Company's shareholders voted to approve the ratification of the appointment of FORVIS MAZARS, LLP as the Company’s independent registered public accounting firm for 2026. The votes regarding this proposal were as follows:

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.