Company: OSBC
Filing Date: 2025-06-02
Form Type: S-8
Source: 0000357173-25-000052
Chunk: 2

Company: OLD SECOND BANCORP INC
Filing Date: 2025-06-02
Form: S-8
Chunk 2
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 furnished and not deemed filed with the SEC), prior to the filing of a post-effective amendment which indicates that all securities offered have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference in this Registration Statement and to be a part hereof from the date of filing of such documents. Any statement contained in this Registration Statement or in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained or incorporated by reference herein or in any subsequently filed document which is deemed to be incorporated by reference herein modifies or supersedes such statement. Any such statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.

SIGNATURES The Registrant:Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Aurora, Illinois, on June 2, 2025. OLD SECOND BANCORP, INC.(Registrant)

| ​   | ​                                                      |
| By: | /s/ JAMES L. ECCHER                                    |
|     | Name: James L. Eccher                                  |
|     | Title: Chairman, President and Chief Executive Officer |

KNOW ALL PERSONS BY THESE PRESENTS that each person whose signature appears below hereby constitutes and appoints James L. Eccher and Bradley S. Adams, and each of them singly, his or her true and lawful attorney-in-fact and agent with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign any and all amendments, including post-effective amendments, to this Registration Statement (any of which amendments may make such changes and additions to this Registration Statement as such attorneys-in-fact may deem necessary or appropriate) and to file the same, with all exhibits thereto, and any other documents that may be required in connection therewith, granting unto said attorneys-in-fact and agents full power and authority to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys