Hugh H. Mclean - 03 Sep 2026 Form 4/A - Amendment Insider Report for OLD SECOND BANCORP INC (OSBC)

Reporting relationship: Director
Issuer ticker: OSBC
Reported as of: 03 Sep 2026
Net transaction value: $0
SEC form: 4/A - Amendment
Accepted by SEC: 08 Sep 2026, 17:09:15 UTC
Original report date: 03 Sep 2026
Prior SEC filing: 24 Feb 2026
Next SEC filing: 08 Sep 2026
Source filing: View source filing
Reporting owner signature: /s/ Shirley Cantrell, Attorney-in-Fact

Key filing fact

Hugh H. Mclean filed Form 4/A - Amendment for OLD SECOND BANCORP INC (OSBC) on 08 Sep 2026.

Key facts

This page summarizes Hugh H. Mclean's Form 4/A - Amendment filing for OLD SECOND BANCORP INC (OSBC).
0 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 08 Sep 2026, 17:09.

Change

Previous filing in this sequence was filed on 24 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/A - Amendment disclosures.

View source filing

Reporting Owners (1)

CIK 0001184764 Primary reporting owner

MCLEAN HUGH H

Relationship: Director
Address: 408 S. PROSPECT AVE, ELMHURST
Signature: /s/ Shirley Cantrell, Attorney-in-Fact
Signature date: 08 Sep 2026

Reported non-derivative transactions

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

OSBC holding

Old Second Bancorp, Inc. Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 160,351
Date: 03 Sep 2026
Ownership: Direct
Footnotes: F1

OSBC holding

Restricted Stock Units

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 10,595
Date: 03 Sep 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

The Form 4 filed on September 3, 2026 reported a sale of 25,000 shares of the Issuer's common stock. On September 4, 2026, the reporting person's broker reversed the transaction through its broker error account after determining that it had not timely filed the required Form 144 in connection with the sale. The reporting person did not receive any proceeds from the transaction. This amended Form 4 deletes the previously reported sale and reflects the reporting person's corrected holdings.