GARY S. COLLINS - 02 Mar 2026 Form 4 Insider Report for OLD SECOND BANCORP INC (OSBC)

Role
VICE CHAIRMAN, Director
Signature
/s/ Shirley Cantrell, Attorney-in-Fact
Issuer symbol
OSBC
Transactions as of
02 Mar 2026
Net transactions value
$0
Form type
4
Filing time
04 Mar 2026, 14:51:31 UTC
Previous filing
24 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
COLLINS GARY S VICE CHAIRMAN, Director 37 S. RIVER ST., AURORA /s/ Shirley Cantrell, Attorney-in-Fact 04 Mar 2026 0001184766

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction OSBC Old Second Bancorp, Inc. Common Stock Award +14,432 $0.000000* 5,462 02 Mar 2026 Direct F1
transaction OSBC Old Second Bancorp, Inc. Common Stock Tax liability -4,228 -21% $19.91* 15,666 02 Mar 2026 Direct F2
holding OSBC Old Second Bancorp, Inc. Common Stock 46,624 02 Mar 2026 Direct F3
holding OSBC Old Second Bancorp, Inc. Common Stock 78,256 02 Mar 2026 IRA F4
holding OSBC Old Second Bancorp, Inc. Common Stock 6,805 02 Mar 2026 By 401-K
holding OSBC Restricted Stock Units 37,312 02 Mar 2026 Direct
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
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.