Darin Patrick Campbell - 17 Feb 2026 Form 4 Insider Report for OLD SECOND BANCORP INC (OSBC)

Reporting relationship: President, Powersports Lending, Director
Issuer ticker: OSBC
Reported as of: 17 Feb 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 24 Feb 2026, 18:44:39 UTC
Prior SEC filing: 18 Feb 2026
Next SEC filing: 19 Feb 2026
Source filing: View source filing
Reporting owner signature: /s/ Shirley Cantrell, Attorney-in-Fact

Key filing fact

Darin Patrick Campbell filed Form 4 for OLD SECOND BANCORP INC (OSBC) on 24 Feb 2026.

Key facts

This page summarizes Darin Patrick Campbell's Form 4 filing for OLD SECOND BANCORP INC (OSBC).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 24 Feb 2026, 18:44.

Change

Previous filing in this sequence was filed on 18 Feb 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002074132 Primary reporting owner

Campbell Darin Patrick

Relationship: President, Powersports Lending, Director
Address: 37 S. RIVER ST., AURORA
Signature: /s/ Shirley Cantrell, Attorney-in-Fact
Signature date: 24 Feb 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

OSBC transaction

Restricted Stock

Award

Transaction value: $0
Shares: +10,562
Change %
Price: $0.000000
Shares after: 10,562
Date: 17 Feb 2026
Ownership: Direct
Footnotes: F1

OSBC holding

Old Second Bancorp, Inc. Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 274,589
Date: 17 Feb 2026
Ownership: Direct

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

Each restricted stock unit represents a contingent right to receive one share of common stock. The reporting person was granted 10,562 restricted stock units on the date of the grant, 5,281 of which are time-based restricted stock units that vest on the third anniversary of the grant date, and 5,281 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.