OLD SECOND BANCORP INC — Director's Dealing 2025

Feb 21, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OLD SECOND BANCORP INC (OSBC)
CIK: 0000357173
Period of Report: 2025-02-19

Reporting Person: Pilmer Donald (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-02-19	Restricted Stock Units	A	12142	—	Acquired	38718	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Old Second Bancorp, Inc. Common Stock	57649	Direct
Old Second Bancorp, Inc. Common Stock	5486	Direct
Old Second Bancorp, Inc. Common Stock	1450	Indirect
Old Second Bancorp, Inc. Common Stock	3954	Indirect
Old Second Bancorp, Inc. Common Stock	180	Indirect

Footnotes

F1: Each restricted stock unit represents a contingent right to receive one share of common stock. The reporting person was granted 12,142 restricted stock units on the date of the grant, 6,071 of which are time-based restricted stock units that vest on the third anniversary of the grant date, and 6,071 of which are performance-based restricted stock units that may vest and convert to shares within a range from 0% to 175% of the underlying performance-based restricted stock units originally awarded, depending on our compensation committee approved performance metrics. Vested shares, if any, will be delivered to the reporting person in 3 to 5 business days from the date of vesting.

F2: Of this total, 19,359 shares are performance-based restricted stock units and 19,359 shares are time-based restricted stock units.

F3: These shares are held in Mr. Pilmer's name outright.

F4: These shares are held in spouse's IRA for which Mr. Pilmer is listed as a beneficiary.