Old Second director sells 25K shares at $25.63

A director of OLD SECOND BANCORP INC reported an open-market sale of 25,000 OSBC shares and still holds over 135,000 shares directly.

Rhea-AI Filing Summary

OLD SECOND BANCORP INC (OSBC) director Hugh H. McLean reported selling 25,000 shares of Old Second Bancorp, Inc. Common Stock on September 8, 2026, in an open-market transaction at a weighted average price of $25.6307 per share. Following this sale, he directly holds 135,351 shares.

Insider Trade Summary

Net Seller: 25,000 shares

Net Sell 1 txn

Insider MCLEAN HUGH H

Role Director

Sold 25,000 shs ($641K)

Type	Security	Shares	Price	Value
Sale	Old Second Bancorp, Inc. Common Stock F1	25,000	$25.6307	$641K

Holdings After Transaction: Old Second Bancorp, Inc. Common Stock — 135,351 shares (Direct)

Footnotes (1)

1. F1. The price reported is a weighted average price. The transactions were effected at prices ranging from $25.63 to $25.655, inclusive.

Key Figures

Shares sold: 25,000 shares Weighted average sale price: $25.6307 per share Post-transaction holdings: 135,351 shares +1 more

4 metrics

Shares sold 25,000 shares Old Second Bancorp, Inc. Common Stock sold on September 8, 2026

Weighted average sale price $25.6307 per share Open-market or private sale of OSBC shares

Post-transaction holdings 135,351 shares Directly held by Hugh H. McLean after the September 8, 2026 sale

Reported price range $25.63–$25.655 per share Range of prices at which the sale transactions were effected

Key Terms

weighted average price, open market or private transaction

2 terms

weighted average price financial

"The price reported is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

open market or private transaction financial

"Sale in open market or private transaction"

FAQ

What insider transaction did OSBC director Hugh H. McLean report?

He reported a sale of 25,000 shares of Old Second Bancorp, Inc. Common Stock on September 8, 2026, classified as a sale in an open market or private transaction.

At what price were the OSBC shares sold in this Form 4 filing?

The shares were sold at a weighted average price of $25.6307 per share. A footnote states the trades occurred in a price range from $25.63 to $25.655, inclusive.

How many OSBC shares does Hugh H. McLean hold after this transaction?

After the reported sale, Hugh H. McLean directly holds 135,351 shares of Old Second Bancorp, Inc. Common Stock, as stated in the filing.

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

No. The filing’s Rule 10b5-1 checkbox is not marked as affirming a trading plan, and no footnote indicates that the transaction was made pursuant to a Rule 10b5-1 trading arrangement.

How many OSBC shares in total were sold according to this Form 4?

The filing reports total sales of 25,000 shares of Old Second Bancorp, Inc. Common Stock, with no derivative transactions or gifts reported.

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Available on EDGAR 09/08/2026 - 05:18 PM Accepted by SEC EDGAR 09/08/2026 - 05:17 PM Learn about SEC filing dates

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)
09/08/2026

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)

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	09/08/2026		S		25,000	D	$25.6307(1)	135,351	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 price reported is a weighted average price. The transactions were effected at prices ranging from $25.63 to $25.655, inclusive.

	/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)