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OLD SECOND BANCORP INC Director's Dealing 2025

Oct 1, 2025

32302_dirs_2025-10-01_578e3c2d-bc68-45b6-80e8-6edd804eade4.zip

Director's Dealing

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SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OLD SECOND BANCORP INC (OSBC)
CIK: 0000357173
Period of Report: 2025-09-30

Reporting Person: Pilmer Donald (N/A)

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2025-09-30 Old Second Bancorp, Inc. Common Stock J 1 Acquired 182 Indirect
2025-09-30 Old Second Bancorp, Inc. Common Stock J 14 Acquired 3995 Indirect

Holdings (Non-Derivative)

Security Shares Ownership
Old Second Bancorp, Inc. Common Stock 1450 Indirect
Old Second Bancorp, Inc. Common Stock 63135 Direct
Restricted Stock Units 38718 Direct

Footnotes

F1: Of this total, 1 share was allocated during the third quarter pursuant to the Old Second Bancorp, Inc. Profit Sharing Plan Plan. Information herein was provided by the plan trustee as of 09-30-25.

F2: Of this total, 14 shares were allocated during the third quarter pursuant to the Old Second Bancorp, Inc. Employee Salary Savings Plan. Information herein was provided by the plan trustee as of 09-30-25.

F3: These shares are held in spouse's IRA for which Mr. Pilmer is listed as a beneficiary.

F4: Included in this total are 10 shares in Mr. Pilmer's name as custodian; 34,023 shares held in a brokerage account, 4,295 in his name alone and 26,381 shares of Restricted Stock Units.