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[8-K/A] OLD SECOND BANCORP INC Amends Material Event Report

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OLD SECOND BANCORP INC0000357173true00003571732025-07-012025-07-01

I

United States

Securities And Exchange Commission
Washington, D.C. 20549

FORM 8-K/A

(amendment no. 1)

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 1, 2025

Graphic
(Exact name of registrant as specified in its charter)

Delaware

000-10537

36-3143493

(State or other jurisdiction of incorporation)

(Commission File Number)

(I.R.S. Employer Identification No.)

37 South River Street
Aurora, Illinois 60507
(Address of principal executive offices) (Zip code)

(630) 892-0202
(Registrant’s telephone number, including area code)

N/A

(Former name or former address, if changed since last report)

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 (see General Instruction A.2. below):

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

  Pre-commencement communications 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(s)

Name of each exchange on which registered

Common Stock

OSBC

The Nasdaq Stock Market

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

Explanatory Note

On July 1, 2025, Old Second Bancorp, Inc. (“Old Second”) filed a Current Report on Form 8-K (the “Initial Filing”) to report that Old Second had completed its acquisition of Bancorp Financial, Inc. (“Bancorp Financial”), pursuant to the Agreement and Plan of Merger, dated as of February 24, 2025 (the “Merger Agreement”) by and between Old Second and Bancorp Financial. Pursuant to the terms of the Merger Agreement, effective July 1, 2025, Bancorp Financial merged with and into Old Second (the “Merger”), with Old Second continuing as the surviving corporation in the Merger. This Current Report on Form 8-K/A amends the Initial Filing to include unaudited consolidated financial statements of Bancorp Financial as of June 30, 2025 and 2024, and for the six-month periods ended June 30, 2025 and 2024 and related notes and pro forma financial information as of and for the six months ended June 30, 2025, each as required by Item 9.01 of Form 8-K.

The pro forma financial information included in this Current Report on Form 8-K/A has been presented for informational purposes only, as required by Form 8-K. It does not purport to represent the actual results of operations that Old Second and Bancorp Financial would have achieved had the companies been combined during the periods presented in the pro forma financial information and is not intended to project the future results of operations that the combined company may achieve after completion of the Merger. Except as described above, all other information in the Initial Filing remains unchanged.

Item 9.01 Financial Statements and Exhibits

(a) Financial Statements of Businesses Acquired.

The audited consolidated financial statements of Bancorp Financial, Inc. as of December 31, 2024 and 2023, and for each of the years in the two-year period ended December 31, 2024, and related notes, are hereby incorporated by reference to Exhibit 99.1 hereto.

The unaudited consolidated financial statements of Bancorp Financial, Inc. as of June 30, 2025 and 2024, and for the six-month periods ended June 30, 2025 and 2024, and related notes, are hereby incorporated by reference to Exhibit 99.2 hereto.

(b) Pro Forma Financial Information.

The unaudited pro forma condensed combined balance sheet as of December 31, 2024 and the unaudited pro forma condensed combined income statement for the year ended December 31, 2024, are hereby incorporated by reference to Exhibit 99.3 hereto.

The unaudited pro forma condensed combined balance sheet as of June 30, 2025 and the unaudited pro forma condensed combined income statement for the six months ended June 30, 2025, are hereby incorporated by reference to Exhibit 99.4 hereto.

2

(d) Exhibits.

Exhibit No.

Description

23.1

Consent of RSM US LLP.

99.1

Audited consolidated financial statements of Bancorp Financial, Inc. as of December 31, 2024 and 2023, and for each of the years in the two-year period ended December 31, 2024, and related notes (incorporated by reference to Old Second Bancorp, Inc.’s Amendment No. 1 to the Registration Statement on Form S-4 (File Number 333-286687) filed on May 6, 2025).

99.2

Interim consolidated financial statements of Bancorp Financial, Inc. as of June 30, 2025 and 2024, and for the six-month periods ended June 30, 2025 and 2024, and related notes.

99.3

Unaudited pro forma condensed combined balance sheet as of December 31, 2024 and the unaudited pro forma condensed combined income statement for the year ended December 31, 2024 (incorporated by reference to Old Second’s Amendment No. 1 to the Registration Statement on Form S-4 (File Number 333-286687) filed on May 6, 2025).

99.4

Unaudited pro forma condensed combined balance sheet as of June 30, 2025 and the unaudited pro forma condensed combined income statement for the six months ended June 30, 2025.

104

Cover Page Interactive Data File (the cover page XBRL tags are embedded within the Inline XBRL document)

3

Signature

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.

OLD SECOND BANCORP, INC.

Dated: September 17, 2025

By:

/s/ Bradley S. Adams

Bradley S. Adams

Executive Vice President,

Chief Operating Officer and

Chief Financial Officer

4

Old Second Bancorp Inc Ill

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