FIRST FINANCIAL CORPORATION

FIRST FINANCIAL CORPORATION_March 17, 2026

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 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) March 17, 2026

FIRST FINANCIAL CORPORATION

(Exact name of registrant as specified in its charter)

Commission File Number: 0-16759

Indiana		35-1546989
(State or other jurisdiction		(I.R.S. Employer
incorporation or organization)		Identification No.)

One First Financial Plaza, Terre Haute, IN		47807
(Address of principal executive office)		(Zip Code)

(812) 238-6000
(Registrant's telephone number, including area code)

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 communication 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 communication pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communication 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:

Title of each class		Trading Symbol		Name of each exchange on which registered
Common Stock, par value $0.125 per share		THFF		The NASDAQ Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

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. ☐

Item 8.01. Other Events.

On March 18, 2026, First Financial Corporation issued a press release to report the declaration of the quarterly dividend of $0.56 per share payable April 15, 2026, to shareholders of record on April 1, 2026.

The release is furnished as Exhibit 99.1 hereto.

Item 9.01. Financial Statements and Exhibits

The exhibit to this report is as follows:

Exhibit Number

99.1		Press Release, dated March 18, 2026, issued by First Financial Corporation. This exhibit shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or 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.

104		Cover page interactive data file (embedded with the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	First Financial Corporation

Dated March 18, 2026
	/s/ Rodger A. McHargue
	Rodger A. McHargue
	Secretary/Treasurer and Chief Financial Officer

First Financial Corporation filed SEC Form 8-K: Other Events, Financial Statements and Exhibits