Business Combination Prospectus (Form 425)

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 Exchange Act of 1934

Date of report (Date of earliest event reported): July 21, 2025

Investar Holding Corporation

(Exact name of registrant as specified in its charter)

s telephone number, including area code: (225)

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:

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 July 21, 2025, Investar Holding Corporation (the "Company"), the holding company of Investar Bank, National Association (the "Bank"), issued a press release reporting second quarter 2025 results and posted on its website its second quarter 2025 earnings release and investor presentation. The materials contain forward-looking statements regarding the Company and include a cautionary note identifying important factors that could cause actual results to differ materially from those anticipated. Copies of the earnings release and investor presentation are furnished as Exhibit 99.1 and Exhibit 99.2 to this Current Report on Form 8-K.

The information contained in Item 2.02, including Exhibit 99.1 and Exhibit 99.2 of this Current Report, shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act except as shall be expressly set forth by specific reference in such a filing.

(d) Exhibits

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.