OLD SECOND BANCORP INC — Director's Dealing 2025

Jul 7, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OLD SECOND BANCORP INC (OSBC)
CIK: 0000357173
Period of Report: 2025-06-30

Reporting Person: Pilmer Donald (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-06-30	Old Second Bancorp, Inc. Common Stock	J	1	—	Acquired	181	Indirect
2025-06-30	Old Second Bancorp, Inc. Common Stock	J	15	—	Acquired	3981	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 second quarter pursuant to the Old Second Profit Sharing Plan. Information herein was provided by the plan trustee as of 6-30-25.

F2: Of this total, 15 shares were allocated during the second quarter pursuant to the Old Second Employee Salary and Savings Plan. Information herein was provided by the plan trustee as of 6-30-25.

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