Old Second Bancorp (OSBC) vice chair sells 5,120 IRA-held shares at $21.12

Rhea-AI Filing Summary

OLD SECOND BANCORP INC director and vice chairman Gary S. Collins reported an open-market sale of 5,120 shares of Old Second Bancorp, Inc. common stock at $21.12 per share from an IRA account. The transaction is classified as an indirect sale because the shares are held in an IRA.

After this sale, the filing shows Collins indirectly holding 58,136.085 Old Second Bancorp, Inc. common shares in the IRA, 7,058 common shares through a 401‑K plan, and directly holding 30,136 common shares. He also directly holds 37,312 Restricted Stock Units, which represent additional equity-based compensation.

Insider Trade Summary

Net Seller: 5,120 shares ($108,134)

Net Sell 4 txns

Insider COLLINS GARY S

Role VICE CHAIRMAN

Sold 5,120 shs ($108K)

Type	Security	Shares	Price	Value
Sale	Old Second Bancorp, Inc. Common Stock	5,120	$21.12	$108K
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 — 58,136.085 shares (Indirect, IRA); Old Second Bancorp, Inc. Common Stock — 30,136 shares (Direct, null); Restricted Stock Units — 37,312 shares (Direct, null)

Footnotes (1)

Key Figures

Shares sold: 5,120 shares Sale price: $21.12/share IRA holdings after sale: 58,136.085 shares +3 more

6 metrics

Shares sold 5,120 shares Old Second Bancorp, Inc. common stock sold from IRA

Sale price $21.12/share Open-market or private transaction price

IRA holdings after sale 58,136.085 shares Old Second Bancorp, Inc. common stock, indirect ownership

Direct common shares 30,136 shares Old Second Bancorp, Inc. common stock held directly

401-K common shares 7,058 shares Old Second Bancorp, Inc. common stock held via 401-K

Restricted Stock Units 37,312 units Equity-based compensation held directly

Key Terms

Restricted Stock Units, open-market sale, indirect ownership, Form 4

4 terms

Restricted Stock Units financial

"The filing shows Collins directly holding 37,312 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.

open-market sale financial

"reported an open-market sale of 5,120 shares of common stock"

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.

indirect ownership financial

"The transaction is classified as an indirect sale because the shares are held in an IRA"

Form 4 regulatory

"The filing lists Old Second Bancorp, Inc. common stock and Restricted Stock Units"

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 4 Insider Transactions: What Each Field Means →

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)
05/22/2026

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	05/22/2026		S		5,120	D	$21.12	58,136.085	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	05/26/2026
	** 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)

FAQ

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

Gary S. Collins reported selling 5,120 shares of Old Second Bancorp, Inc. common stock in an open-market transaction at $21.12 per share. The sale was made from an IRA account and is reported as an indirect ownership transaction.

At what price did Gary S. Collins sell OSBC shares in this Form 4?

The reported sale price was $21.12 per share for 5,120 Old Second Bancorp, Inc. common shares. This price reflects the transaction value disclosed for the open-market or private sale from Collins’ IRA account on the reported transaction date.

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

After the sale, Collins holds 58,136.085 Old Second Bancorp, Inc. common shares indirectly in an IRA, 7,058 common shares through a 401‑K plan, and 30,136 common shares directly, plus 37,312 Restricted Stock Units as additional equity-based compensation.

What types of OSBC securities are shown in Gary S. Collins’ holdings?

The filing lists Old Second Bancorp, Inc. common stock and Restricted Stock Units. Collins holds common shares directly, in a 401‑K plan, and in an IRA, while the Restricted Stock Units represent compensation that may convert into common shares under plan terms.

Is the OSBC share sale by Gary S. Collins a direct or indirect transaction?

The reported 5,120-share sale is an indirect transaction because the shares are held in an IRA. The Form 4 classifies this as indirect ownership, distinguishing it from his separate directly held shares and 401‑K holdings in Old Second Bancorp, Inc.