0000708955 2026-09-04 2026-09-04 0000708955 1 2026-09-04 2026-09-04 iso4217:USD pure shares S-4 S-4 EX-FILING FEES 0000708955 FIRST FINANCIAL BANCORP /OH/ N/A N/A S-4 FIRST FINANCIAL BANCORP /OH/ false Equity Common shares, no par value true 5849552.7 185322495.54 0.0001381 25593.04 185322495.54 25593.04 0.00 0.00 25593.04 true The amount in the "Amount Registered" column represents the estimated maximum number of common shares, no par value, of First Financial Bancorp. ("First Financial" and such shares, the "First Financial common shares") to be issued upon the completion of the transactions contemplated by the Agreement and Plan of Merger, dated as of July 21, 2026, by and among First Financial and Finward Bancorp ("Finward") (as may be amended, the "merger agreement" and such transactions contemplated thereby, the "merger") and is based upon the product of (x) the maximum number of shares of common stock, no par value per share ("Finward common stock"), outstanding as of September 1, 2026 or issuable or that may be assumed or exchanged in connection with the merger, collectively equal to 4,333,002, multiplied by (y) the exchange ratio of 1.35 First Financial common shares for each share of Finward common stock. Estimated solely for the purpose of calculating the registration fee required by Section 6(b) of the Securities Act of 1933, as amended (the "Securities Act") and calculated in accordance with Rules 457(c) and 457(f)(1) promulgated thereunder. The aggregate offering price is (i) the average of the high and low prices ($42.97 and $42.56, respectively) of Finward common stock as reported on the Nasdaq Capital Market on September 1, 2026 ($42.77) multiplied by (ii) the estimated maximum number of shares of Finward common stock to be converted in the merger (4,333,002). Calculated by multiplying the estimated aggregate offering price of securities to be registered by 0.00013810. 4333002 42.77 185322495.54 185322495.54