OLD SECOND BANCORP INC — Director's Dealing 2025

Nov 26, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OLD SECOND BANCORP INC (OSBC)
CIK: 0000357173
Period of Report: 2025-11-26

Reporting Person: Ladowicz John (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-11-26	Old Second Bancorp, Inc. Common Stock	S	13150	$19.0107	Disposed	162154	Indirect
2025-09-14	Restricted Stock Units	J	10551	—	Disposed	0	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Old Second Bancorp, Inc. Common Stock	36121	Direct

Footnotes

F1: Included in this total are 153,862 shares in a ROTH IRA and 8,292 shares in a traditional IRA.

F2: Included in this total are 10,551 shares of restricted stock units that vested automatically upon Mr. Ladowicz' retirement on September 14, 2025.