Old Second director 25K share sale reversed

Amended Form 4 for OLD SECOND BANCORP INC deletes a reversed 25,000‑share sale and updates director Hugh H. McLean’s reported holdings.

Available on EDGAR 09/08/2026 - 05:09 PM EDT Accepted by SEC EDGAR 09/08/2026 - 05:09 PM EDT Learn about SEC filing dates

This filing corrects an earlier one, and you can read the original Form 4 if you want to see what changed.

Rhea-AI Filing Summary

OLD SECOND BANCORP INC (OSBC) director Hugh H. McLean filed an amended insider report that removes a previously reported sale of 25,000 shares of Old Second Bancorp common stock. The broker reversed the sale on September 4, 2026 through its broker error account after determining that it had not timely filed the required Form 144, and McLean did not receive any proceeds.

The amendment deletes the prior sale entry and now reflects corrected holdings of 160,351 shares of Old Second Bancorp common stock and 10,595 Restricted Stock Units held directly. No transactions under a Rule 10b5-1 trading plan are reported.

Insider Trade Summary

Holdings reported, no transactions

Holdings

Insider MCLEAN HUGH H

Role Director

Type	Security	Shares	Price	Value
Holding	Old Second Bancorp, Inc. Common Stock F1	--	--	--
Holding	Restricted Stock Units	--	--	--

Holdings: Old Second Bancorp, Inc. Common Stock — 160,351 shares (Direct); Restricted Stock Units — 10,595 shares (Direct)

Footnotes (1)

1. 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.

Key Figures

Reversed sale: 25,000 shares Common stock holdings after amendment: 160,351 shares Restricted Stock Units holdings: 10,595 units +1 more

4 metrics

Reversed sale 25,000 shares Sale of issuer common stock that was reported on September 3, 2026 and later reversed through a broker error account

Common stock holdings after amendment 160,351 shares Directly held Old Second Bancorp common stock after deletion of the reversed sale

Restricted Stock Units holdings 10,595 units Directly held Restricted Stock Units tied to Old Second Bancorp common stock

Proceeds from reversed sale $0 Footnote states the reporting person did not receive any proceeds from the 25,000‑share transaction

Key Terms

Form 4, Form 144, broker error account, Restricted Stock Units

4 terms

Form 4 regulatory

"The Form 4 filed on September 3, 2026 reported a sale"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Form 144 regulatory

"had not timely filed the required Form 144 in connection"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

broker error account financial

"the reporting person's broker reversed the transaction through its broker error account"

Restricted Stock Units financial

"Restricted Stock Units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What change does this amended Form 4/A report for OSBC?

The amended filing removes a previously reported 25,000‑share sale of Old Second Bancorp common stock. That sale was reversed by the broker, so the amendment deletes the sale and updates Hugh H. McLean’s reported holdings to reflect the corrected position.

How many OSBC common shares does Hugh H. McLean now report holding?

After the amendment, Hugh H. McLean reports holding 160,351 shares of Old Second Bancorp common stock directly. This figure reflects the deletion of the earlier, now‑reversed 25,000‑share sale.

How many Restricted Stock Units tied to OSBC does McLean report?

Hugh H. McLean reports holding 10,595 Restricted Stock Units directly. These units are reported separately from his 160,351 shares of Old Second Bancorp common stock.

Why was the 25,000‑share OSBC sale reversed and deleted?

The broker determined it had not timely filed the required Form 144 for the 25,000‑share sale. On September 4, 2026, the broker reversed the transaction through its broker error account, and the amended report therefore deletes the previously reported sale.

Did Hugh H. McLean receive any proceeds from the reversed OSBC share sale?

No. The footnote states that the reporting person did not receive any proceeds from the 25,000‑share sale that was later reversed through the broker’s error account.

Was the OSBC transaction made under a Rule 10b5-1 trading plan?

No trading plan is reported. The filing indicates that the Rule 10b5‑1 checkbox is not marked, and the explanatory footnote does not describe the sale or its reversal as occurring under a Rule 10b5‑1 trading arrangement.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

MCLEAN HUGH H

(Last) (First) (Middle)

408 S. PROSPECT AVE

(Street)

ELMHURST ILLINOIS 60126

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
OLD SECOND BANCORP INC [ OSBC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/03/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)
09/03/2026

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Old Second Bancorp, Inc. Common Stock								160,351(1)	D
Restricted Stock Units								10,595	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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.

	/s/ Shirley Cantrell, Attorney-in-Fact	09/08/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)