OLD SECOND BANCORP INC — Director's Dealing 2026

Feb 19, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OLD SECOND BANCORP INC (OSBC)
CIK: 0000357173
Period of Report: 2026-02-18

Reporting Person: Campbell Darin Patrick (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-18	Old Second Bancorp, Inc. Common Stock	S	35000	$20.94	Disposed	274589	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Old second Bancorp Inc., Common Stock	0	Indirect

Footnotes

F1: The 31,159 shares reported in a prior Form 4 were disposed of on October 31, 2025 and were previously reported as such. Those shares were inadvertently included again in the prior filing due to a data import error. This From 4 corrects that error and reflects a zero (0) balance of shares.