| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Gartelmann Richard A JR | EVP | 37 S. RIVER ST., AURORA | /s/ Shirley Cantrell, Attorney-in-Fact | 24 Feb 2026 | 0001840027 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | OSBC | Restricted Stock Units | Award | $0 | +5,912 | +29% | $0.000000 | 26,464 | 17 Feb 2026 | Direct | F1 |
| transaction | OSBC | Restricted Stock Units | Tax liability | $18,390 | -894 | -3.6% | $20.57 | 23,879 | 21 Feb 2026 | Direct | F2 |
| holding | OSBC | Old Second Bancorp, Inc. Common Stock | 1,691 | 17 Feb 2026 | Direct | F3 | |||||
| holding | OSBC | Old Second Bancorp, Inc. Common Stock | 24,874 | 17 Feb 2026 | Direct | ||||||
| holding | OSBC | Old Second Bancorp, Inc. Common Stock | 12,563 | 17 Feb 2026 | By 401-K |
| Id | Content |
|---|---|
| F1 | Each restricted stock unit represents a contingent right to receive one share of common stock. The reporting person was granted 5,912 restricted stock units on the date of the grant, 2,956 of which are time-based restricted stock units that vest on the third anniversary of the grant date, and 2,956 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 | Represents shares withheld by the issuer to satisfy applicable tax withholding obligations in connection with the vesting of 2,585 previously reported time-based restricted stock units, the remaining shares of which were issued and added to the reporting person's common stock holdings. |
| F3 | These shares are held in Mr. Gartelmann's name outright. |