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THFF S-4: Acquisition

First Financial Corporation

Filed with the SEC on · accession 0001104659-26-124611

THFF filed a S-4 (s-4) with the SEC on Nov 9, 2026. First Financial Corporation filed an amended S-4 registration statement for its proposed merger with First Illinois Corporation, in which First Illinois shareholders will receive either 0.5727 shares of FFC common stock, $44.35 in cash, or a combination per share. The stock moved +1.0% by the first close after the filing.

Summary of the filing

First Financial Corporation filed an amended S-4 registration statement for its proposed merger with First Illinois Corporation, in which First Illinois shareholders will receive either 0.5727 shares of FFC common stock, $44.35 in cash, or a combination per share. The combined company will have approximately $7.0 billion in total assets and 90 branches across five states.

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Key details

Cash consideration per share of First Illinois common stock$44
Exchange ratio for stock consideration (shares of FFC common stock per share of First Illinois common stock)shares 1
Combined company total assets$7.0B
Combined company market capitalization$985.2M
Acquirer / surviving companyFirst Financial Corporation
Target company being acquiredFirst Illinois Corporation
Wholly owned subsidiary of first illinois, merging into first illinois prior to the mergerHPB Holdings, Inc.
Illinois chartered commercial bank subsidiary of first illinois, to merge into first financial bankHickory Point Bank and Trust
Wholly owned bank subsidiary of first financial corporation, surviving bank in the bank mergerFirst Financial Bank, National Association
President and chief executive officer of first financial corporationNorman D. Lowery

How THFF stock reacted

Close before

$76.24

Nov 6, 2026

First close after

+0.98%

$76.99

5 trading days

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Since filing

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Frequently asked questions

What did THFF file with the SEC on Nov 9, 2026?

THFF filed a S-4 (Acquisition). First Financial Corporation filed an amended S-4 registration statement for its proposed merger with First Illinois Corporation, in which First Illinois shareholders will receive either 0.5727 shares of FFC common stock, $44.35 in cash, or a combination per share. The combined company will have approximately $7.0 billion in total assets and 90 branches across five states.

What does a acquisition mean for THFF stock?

A contract important enough that investors need to know about it — a big customer contract, a loan, a merger agreement or a partnership.

How do I read a S-4?

A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A S-4 (s-4): A report the company filed with the SEC (the US market regulator).

How did THFF stock react to this filing?

THFF closed at $76.24 before the filing and $76.99 on Nov 9, 2026 (+0.98%).

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