Old Second Bancorp director sells 10,000 shares

Old Second Bancorp Inc. vice chairman and director Gary S. Collins reported an open-market sale of 10,000 shares of Old Second Bancorp common stock at $21.12 per share through an IRA.

Rhea-AI Filing Summary

Old Second Bancorp Inc. vice chairman and director Gary S. Collins reported an open-market sale of 10,000 shares of Old Second Bancorp common stock at $21.12 per share through an IRA. After this transaction, the IRA holds 63,256.085 shares.

The filing also shows Collins with 30,136 shares of common stock held directly, 7,058 shares held indirectly through a 401-K, and 37,312 restricted stock units as of the reported date. These additional lines reflect reported holdings rather than new purchases or sales.

Insider Trade Summary

Net Seller: 10,000 shares

Net Sell 4 txns

Insider COLLINS GARY S

Role VICE CHAIRMAN

Sold 10,000 shs ($211K)

Type	Security	Shares	Price	Value
Sale	Old Second Bancorp, Inc. Common Stock	10,000	$21.12	$211K
holding	Old Second Bancorp, Inc. Common Stock	--	--	--
holding	Old Second Bancorp, Inc. Common Stock	--	--	--
holding	Restricted Stock Units	--	--	--

Holdings After Transaction: Old Second Bancorp, Inc. Common Stock — 63,256.085 shares (Indirect, IRA); Old Second Bancorp, Inc. Common Stock — 30,136 shares (Direct); Old Second Bancorp, Inc. Common Stock — 7,058 shares (Indirect, By 401-K); Restricted Stock Units — 37,312 shares (Direct)

Key Figures

Shares sold: 10,000 shares Sale price: $21.12 per share IRA holdings after sale: 63,256.085 shares +3 more

6 metrics

Shares sold 10,000 shares Open-market sale of common stock

Sale price $21.12 per share Price for 10,000-share sale

IRA holdings after sale 63,256.085 shares Old Second Bancorp common stock in IRA post-transaction

Direct common shares 30,136 shares Directly held Old Second Bancorp common stock

401-K holdings 7,058 shares Indirect holdings via 401-K

Restricted Stock Units 37,312 units RSU holdings reported as of transaction date

Key Terms

Restricted Stock Units, open-market sale, IRA, 401-K

4 terms

Restricted Stock Units financial

"security_title: Restricted Stock Units with 37,312 units reported as holdings"

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.

open-market sale financial

"transaction_action: open-market sale of 10,000 common shares at $21.12"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

IRA financial

"nature_of_ownership: IRA for 10,000-share sale and 63,256.085 post-transaction shares"

An individual retirement account (IRA) is a savings account designed to help people put aside money for their retirement, often with tax advantages that encourage long-term savings. It matters to investors because it can grow over time, providing financial security later in life, and offers benefits that can reduce current taxes or allow investments to compound more effectively.

401-K financial

"nature_of_ownership: By 401-K for 7,058 indirectly held common shares"

FAQ

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

What insider transaction did OSBC vice chairman Gary S. Collins report?

Gary S. Collins reported selling 10,000 shares of Old Second Bancorp common stock. The sale was an open-market transaction at $21.12 per share and was executed through an IRA account, according to the Form 4 filing details.

At what price were the OSBC shares sold in Gary S. Collins’ Form 4?

The 10,000 Old Second Bancorp shares were sold at $21.12 each. This open-market sale price comes directly from the Form 4 transaction data for the non-derivative common stock entry dated May 21, 2026.

How many OSBC shares does Gary S. Collins’ IRA hold after the sale?

After the reported 10,000-share sale, the IRA associated with Gary S. Collins holds 63,256.085 Old Second Bancorp shares. This post-transaction balance is disclosed in the Form 4 as the total shares following the transaction for that IRA account.

What other Old Second Bancorp holdings does Gary S. Collins report on this Form 4?

Besides the IRA position, Collins reports 30,136 Old Second Bancorp common shares held directly and 7,058 shares held indirectly via a 401-K. He also reports 37,312 restricted stock units, all shown as holdings as of the transaction date.

Is the OSBC insider transaction a buy or a sell by Gary S. Collins?

The Form 4 shows a sell transaction by Gary S. Collins. Specifically, it records an open-market sale of 10,000 Old Second Bancorp common shares, coded as an “S” transaction, indicating a sale in the open market or a private transaction.

Does Gary S. Collins hold Old Second Bancorp shares both directly and indirectly?

Yes. The Form 4 indicates 30,136 Old Second Bancorp shares held directly and 7,058 shares held indirectly through a 401-K, plus 63,256.085 shares held indirectly via an IRA, alongside 37,312 restricted stock units.

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

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Accepted by SEC EDGAR 05/21/2026 - 05:35 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^*

COLLINS GARY S

(Last) (First) (Middle)

37 S. RIVER ST.

(Street)

AURORA ILLINOIS 60302

(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)
	VICE CHAIRMAN

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/21/2026

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	05/21/2026		S		10,000	D	$21.12	63,256.085	I	IRA
Old Second Bancorp, Inc. Common Stock								30,136	D
Old Second Bancorp, Inc. Common Stock								7,058	I	By 401-K
Restricted Stock Units								37,312	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:

	/s/ Shirley Cantrell, Attorney-in-Fact	05/21/2026
	** 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)