JILL E. YORK - 17 Feb 2026 Form 4 Insider Report for OLD SECOND BANCORP INC (OSBC)

Role
Director
Signature
/s/ Shirley Cantrell, Attorney-in-Fact
Issuer symbol
OSBC
Transactions as of
17 Feb 2026
Net transactions value
-$63,294
Form type
4
Filing time
24 Feb 2026, 19:39:09 UTC
Previous filing
21 Feb 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
YORK JILL E Director C/O MB FINANCIAL INC, 6111 NORTH RIVER ROAD, ROSEMONT /s/ Shirley Cantrell, Attorney-in-Fact 24 Feb 2026 0001244438

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction OSBC Restricted Stock Units Award $0 +3,121 +30% $0.000000 13,672 17 Feb 2026 Direct F1
transaction OSBC Restricted Stock Units Tax liability $63,294 -3,077 -23% $20.57 10,595 21 Feb 2026 Direct F2
holding OSBC Old Second Bancorp, Inc. Common Stock 3,077 17 Feb 2026 Direct F3
holding OSBC Old Second Bancorp, Inc. Common Stock 21,626 17 Feb 2026 Held in Trust with spouse
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 These shares represent restricted stock units granted pursuant to the Old Second Bancorp, Inc. Long Term Incentive Plan. These shares have a three-year cliff vesting.
F2 Represents shares vested upon the third anniversary of the date of grant previously reported and are now issued and added to the reporting person's common stock holdings outright.
F3 These shares are held in Ms. York's name outright.