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Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company" and "emerging growth company" in Rule 12b-2 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"):

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 7(a)(2)(B) of the Securities Act. ☐

This Registration Statement shall become effective upon filing in accordance with Rule 464 promulgated under the Securities Act of 1933, as amended.

EXPLANATORY NOTE

This Post-Effective Amendment No. 1 relates to the following Registration Statements on Form S-8 (each, a "Registration Statement" and collectively, the "Registration Statements") filed with the Securities and Exchange Commission (the "SEC") by First Savings Financial Group, Inc. (the "Registrant"):

i.

Registration Statement (File No. 333-286162) filed with the SEC on March 27, 2025, pertaining to the registration of 138,000 shares of the common stock, par value $0.01 per share of the Registrant (the "Common Stock"), reserved for issuance under the First Savings Financial Group, Inc. 2025 Equity Incentive Plan.

ii.	Registration Statement (File No. 333-260585) filed with the SEC on October 29, 2021, pertaining to the registration of 356,058 shares of the Common Stock, reserved for issuance under the First Savings Financial Group, Inc. 2021 Equity Incentive Plan.

iii.	Registration Statement (File No. 333-211554) filed with the SEC on May 24, 2016, pertaining to the registration of 88,000 shares of the Common Stock, reserved for issuance under the First Savings Financial Group, Inc. 2016 Equity Incentive Plan.

iv.	Registration Statement (File No. 333-166430) filed with the SEC on April 30, 2010, pertaining to the registration of 355,885 shares of the Common Stock, reserved for issuance under the First Savings Financial Group, Inc. 2010 Equity Incentive Plan.

v.

Registration Statement (File No. 333-154417) filed with the SEC on October 17, 2008, pertaining to the registration of 250,000 shares of the Common Stock, reserved for issuance under the First Savings Bank, F.S.B. Employees' Savings & Profit Sharing Plan and Trust and registering an indeterminate number of participation interests, all for offer and sale under the First Savings Bank, F.S.B. Employees' Savings & Profit Sharing Plan and Trust.

In connection with the consummation of the merger of the Registrant with and into First Merchants Corporation, with First Merchants Corporation as the surviving corporation, effective February 1, 2026, the Registrant intends to terminate and suspend all reporting obligations with the SEC under the Securities Exchange Act of 1934, as amended. Accordingly, pursuant to the undertaking contained in the Registration Statements to remove from registration by means of a post-effective amendment any of the securities that remain unsold at the termination of the offering, the Registrant hereby amends the Registration Statements by deregistering all shares of the Registrant's common stock, and all options therefor, that remain unissued and unsold under the Registration Statements, if any, as of the date hereof.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all the requirements for filing on Form S-8 and has duly caused the Post-Effective Amendment No. 1 to the Registration Statements on Form S-8 to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Jeffersonville, Indiana, on February 2, 2026.

Pursuant to the requirements of the Securities Act of 1933, as amended, this registration statement has been signed by the following persons in the capacities and on the date indicated.

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