COLLINS GARY S 4

4 · OLD SECOND BANCORP INC · Filed Mar 4, 2026

Form 4

Period: 2026-03-02

DirectorVICE CHAIRMAN

Transactions

Award
Old Second Bancorp, Inc. Common Stock
[F1]
2026-03-02+14,432→ 5,462 total
Tax Payment
Old Second Bancorp, Inc. Common Stock
[F2]
2026-03-02$19.91/sh−4,228$84,179→ 15,666 total

Holdings

Footnotes (4)

[F1]Shares delivered to the reporting person pursuant to vesting of performance-based restricted stock units granted under the Old Second Bancorp, Inc. 2019 Equity Incentive Plan, as Amended and Restated and vested upon achievement of performance goals for the applicable performance period. The reporting person reported an acquisition of 8,246 on Form 4 filed February 21, 2023, which represented the number of shares that would be delivered if target performance was achieved during the performance period. Actual performance exceeded the target performance for the performance period which resulted in an additional grant of 6,186 shares.
[F2]Represents shares withheld by the issuer to satisfy applicable tax withholding obligations in connection with the vesting of 14,432 previously reported performance-based restricted stock units, the remaining shares of which were issued and added to the reporting person's common stock holdings.
[F3]Included in this total are 41,762 shares of restricted stock units and 69,236.306 shares in Mr. Collins name in a broker account.
[F4]Included in this total are 41,000 shares in a ROTH IRA and 37,256.085 in a traditional IRA.

Signature

/s/ Shirley Cantrell, Attorney-in-Fact|2026-03-04

Documents

1 file