Company: OSBC
Filing Date: 2025-06-30
Form Type: 11-K
Source: 0000357173-25-000063
Chunk: 9

Company: OLD SECOND BANCORP INC
Filing Date: 2025-06-30
Form: 11-K
Chunk 9
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 charged. Old Second National Bank paid certain accounting, administrative and investment management service expenses for the Plan in the amount of $84,858 for year ended December 31, 2024. 7.Subsequent Events On February 24, 2025, Old Second Bancorp, Inc. (“Old Second”) and Bancorp Financial, Inc. entered into an Agreement and Plan of Merger (the “merger agreement”). The merger agreement provides that, upon the terms and subject to the conditions set forth therein, Bancorp Financial will merge with and into Old Second, with Old Second continuing as the surviving entity (the “merger”). Immediately following the merger, Evergreen Bank Group (“Evergreen Bank”), an Illinois state-chartered bank and wholly-owned subsidiary of Bancorp Financial, will merge with and into Old Second National Bank, a national banking association and wholly-owned subsidiary of Old Second, with Old Second National Bank continuing as the surviving bank (the “bank merger”). Subject to the terms and conditions of the merger agreement, at the time the merger becomes effective, the Company shall cause the Bancorp Financial, Inc. 401(k) Plan (“Bancorp Plan”) to be terminated. Upon request participants that are active employees of Old Second National Bank are eligible to rollover the Bancorp Plan funds into the Plan. The merger is expected to be completed in the third quarter of 2025, as of June 30, 2025 all necessary conditions of the merger have been met. The merger is not expected to have a material impact on the Plan.

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<div align='center'>Supplemental Schedule

12</div>

EIN 36-3143493 Plan #003 Old Second Bancorp, Inc. Employees’ 401(k) Savings Plan and Trust Schedule H, Line 4i – Schedule of Assets (Held at End of Year) EIN #36-3143493 Plan #003

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| ​                                                                                       | ​ |  Units/ | ​ | Current |             | ​ |
| Identity of Issuer/Description                                                          |   |  Shares |   | Value   |             |   |
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| Money Market Account                                                                    |