Old Second director sells 24,000 shares at $25.53

OSBC’s President of Powersports Lending and director sold 24,000 common shares and now directly holds 250,589 common shares plus 10,562 restricted shares.

Rhea-AI Filing Summary

OLD SECOND BANCORP INC (OSBC) director and officer Darin Patrick Campbell reported selling 24,000 shares of Old Second Bancorp, Inc. common stock on September 2, 2026 in an open-market or private sale at a weighted average price of $25.533 per share, with individual sale prices ranging from $25.50 to $25.60. After this sale, he directly held 250,589 shares of common stock and 10,562 shares of restricted stock. No Rule 10b5-1 trading plan is reported for this sale.

Insider Trade Summary

Net Seller: 24,000 shares

Net Sell 2 txns

Insider Campbell Darin Patrick

Role President, Powersports Lending

Sold 24,000 shs ($613K)

Type	Security	Shares	Price	Value
Sale	Old Second Bancorp, Inc. Common Stock F1	24,000	$25.533	$613K
holding	Restricted Stock	--	--	--

Holdings After Transaction: Old Second Bancorp, Inc. Common Stock — 250,589 shares (Direct); Restricted Stock — 10,562 shares (Direct)

Footnotes (1)

1. F1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.50 to $25.60, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Key Figures

Shares sold: 24,000 shares Weighted average sale price: $25.533 per share Sale price range: $25.50–$25.60 per share +2 more

5 metrics

Shares sold 24,000 shares Common stock sold by Darin Patrick Campbell on September 2, 2026

Weighted average sale price $25.533 per share Average price for the 24,000 OSBC shares sold on September 2, 2026

Sale price range $25.50–$25.60 per share Range of individual sale prices for the reported transactions

Common shares held after sale 250,589 shares Direct holdings of Old Second Bancorp, Inc. common stock after the sale

Restricted stock held 10,562 shares Direct holdings of restricted stock reported for the same date

Key Terms

weighted average price, Restricted Stock, Old Second Bancorp, Inc. Common Stock

3 terms

weighted average price financial

"The price reported in Column 4 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.

Restricted Stock financial

"Restricted Stock listed as a separate holding entry for the reporting person"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

Old Second Bancorp, Inc. Common Stock financial

"Old Second Bancorp, Inc. Common Stock identified as the security sold"

FAQ

What insider sale did OSBC report for Darin Patrick Campbell?

OLD SECOND BANCORP INC reported that Darin Patrick Campbell sold 24,000 shares of Old Second Bancorp, Inc. common stock on September 2, 2026 at a weighted average price of $25.533 per share, with individual sales between $25.50 and $25.60.

How many OSBC common shares does Darin Patrick Campbell own after this sale?

After the reported sale, Darin Patrick Campbell directly owns 250,589 shares of Old Second Bancorp, Inc. common stock, according to the filing’s post-transaction holdings figure.

What restricted stock holdings in OSBC does Darin Patrick Campbell report?

The filing states that Darin Patrick Campbell directly holds 10,562 shares of restricted stock of OLD SECOND BANCORP INC as of the same reporting date.

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

No. The filing indicates that the Rule 10b5-1 checkbox is not marked, so no Rule 10b5-1 trading plan is reported in connection with this sale of OSBC shares.

What price range did OSBC insider Campbell’s share sales occur at?

The filing notes that the reported weighted average price of $25.533 per share reflects multiple trades executed in a price range from $25.50 to $25.60 per share, inclusive.

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

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Available on EDGAR 09/03/2026 - 05:38 PM Accepted by SEC EDGAR 09/03/2026 - 05:33 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^*

Campbell Darin Patrick

(Last) (First) (Middle)

37 S. RIVER ST.

(Street)

AURORA ILLINOIS 60506

(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
X	Officer (give title below)		Other (specify below)
	President, Powersports Lending

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/02/2026

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	09/02/2026		S		24,000	D	$25.533(1)	250,589	D
Restricted Stock								10,562	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 in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.50 to $25.60, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

	/s/ Shirley Cantrell, Attorney-in-Fact	09/03/2026
	** 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)