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OLD SECOND BANCORP INC Director's Dealing 2026

Jan 5, 2026

32302_dirs_2026-01-05_06d56859-54e4-4aed-955e-8ff74078d27f.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: 2025-12-31

Reporting Person: Pilmer Donald (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-12-31	Old Second Bancorp, Inc. Common Stock	J	15	—	Acquired	4010	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Old Second Bancorp, Inc. Common Stock	182	Indirect
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, 15 shares were allocated during the fourth quarter pursuant to the Old Second Bancorp, Inc. Employee Savings Plan & Trust. Information herein was provided by the Plan Trustee as of 12-31-25.

F2: These shares are held in spouse's IRA for which Mr. Pilmer is listed as a beneficiary.