Darin Patrick Campbell - 18 Jul 2025 Form 4 Insider Report for OLD SECOND BANCORP INC (OSBC)

Reporting relationship: President, Powersports Lending, Director
Issuer ticker: OSBC
Reported as of: 18 Jul 2025
Net transaction value: $0
SEC form: 4
Accepted by SEC: 21 Jul 2025, 17:56:13 UTC
Prior SEC filing: 08 Jul 2025
Next SEC filing: 07 Nov 2025
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 21 Jul 2025.

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: 21 Jul 2025, 17:56.

Change

Previous filing in this sequence was filed on 08 Jul 2025.
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: 21 Jul 2025

Reported non-derivative transactions

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

OSBC transaction

Old second Bancorp Inc., Common Stock

Award

Transaction value: $0
Shares: +57,565
Change %
Price: $0.000000
Shares after: 57,565
Date: 18 Jul 2025
Ownership: IRA
Footnotes: F1

OSBC holding

Old Second Bancorp, Inc. Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 309,680
Date: 18 Jul 2025
Ownership: Direct
Footnotes: F2

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

These shares were issuable pursuant to the merger of Bancorp Financial, Inc. with and into Old Second Bancorp, Inc., which became effective on July 1, 2025. The reporting person held 22,300 shares of Bancorp Financial, Inc., which pursuant to the merger agreement was converted into 57,565 shares of Old Second Bancorp, Inc. common stock. These shares are held in a custodial account in an IRA on behalf of the reporting person. The exchange of shares occurred on July 19, 2025.

Footnote F2

These securities are issuable pursuant to the merger of Bancorp Financial, Inc. with and into Old Second Bancorp, Inc., which became effective on July 1, 2025. The reporting person held 119,966 shares of Bancorp Financial, Inc., which pursuant to the merger agreement, will be converted into 309,680 shares of Old Second Bancorp, Inc. common stock. The exchange of shares has not yet occurred, but the right to receive the shares is fixed and irrevocable under the merger agreement. The exchange of shares occurred on July 18, 2025.