Old Second Bancorp (NASDAQ: OSBC) vice chair reports updated share and RSU holdings

Rhea-AI Filing Summary

OLD SECOND BANCORP INC vice chairman Gary S. Collins filed an update to his share holdings, highlighting routine plan-related activity. The filing shows 37 Old Second Bancorp, Inc. common shares were allocated to his 401(k) during the second quarter under the company’s Employee Salary and Savings Plan, bringing that indirect 401(k) position to 7,095 shares as of June 30, 2026. Collins also reports 30,136 common shares held directly in a brokerage account and 58,136.085 common shares held indirectly through IRAs, along with 37,312 restricted stock units.

Insider Trade Summary

4 transactions reported

Mixed 4 txns

Insider COLLINS GARY S

Role VICE CHAIRMAN

Type	Security	Shares	Price	Value
Other	Old Second Bancorp, Inc. Common Stock	37	$0.00	--
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 — 7,095 shares (Indirect, By 401-K); Old Second Bancorp, Inc. Common Stock — 30,136 shares (Direct, null); Restricted Stock Units — 37,312 shares (Direct, null)

Footnotes (1)

1. Of this total, 37 shares were allocated during the second quarter pursuant to the Old Second Bancorp, Inc. Employee Salary and Savings Plan. Information herein was provided by the Plan Trustee as of 6-30-26. These shares are held in a brokerage account in Mr. Collins' name. Included in this total are 30,880 shares in a ROTH IRA and 27,256.085 in a traditional IRA.

Key Figures

401(k) allocation: 37 shares 401(k) holdings: 7,095 shares Direct common shares: 30,136 shares +4 more

7 metrics

401(k) allocation 37 shares Allocated during the second quarter to Employee Salary and Savings Plan

401(k) holdings 7,095 shares Old Second Bancorp, Inc. common stock held indirectly by 401(k) as of June 30, 2026

Direct common shares 30,136 shares Old Second Bancorp, Inc. common stock held in brokerage account

IRA common shares 58,136.085 shares Common stock held indirectly through IRAs as of June 30, 2026

ROTH IRA shares 30,880 shares Included within indirect IRA holdings

Traditional IRA shares 27,256.085 shares Included within indirect IRA holdings

Restricted Stock Units 37,312 units RSUs reported for Gary S. Collins

Key Terms

Restricted Stock Units, Employee Salary and Savings Plan, ROTH IRA, traditional IRA

4 terms

Restricted Stock Units financial

"The filing lists 37,312 restricted stock units for Gary S. Collins."

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.

Employee Salary and Savings Plan financial

"37 shares were allocated during the second quarter pursuant to the Old Second Bancorp, Inc. Employee Salary and Savings Plan."

ROTH IRA financial

"Included in this total are 30,880 shares in a ROTH IRA and 27,256.085 in a traditional IRA."

A Roth IRA is a retirement savings account you fund with money that’s already been taxed, and withdrawals taken in retirement under the account rules are tax-free. It matters to investors because it shifts the tax bill to today instead of retirement, potentially increasing after-tax income later—think of it like paying for a lifetime subscription now so you can use it without extra charges in the future—helpful for long-term tax planning and flexibility.

traditional IRA financial

"Included in this total are 30,880 shares in a ROTH IRA and 27,256.085 in a traditional IRA."

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/02/2026 - 10:23 AM Accepted by SEC EDGAR 07/02/2026 - 10:22 AM 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)
06/30/2026

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	06/30/2026		J		37(1)	A	$0	7,095	I	By 401-K
Old Second Bancorp, Inc. Common Stock								30,136(2)	D
Old Second Bancorp, Inc. Common Stock								58,136.085(3)	I	IRA
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:

1. Of this total, 37 shares were allocated during the second quarter pursuant to the Old Second Bancorp, Inc. Employee Salary and Savings Plan. Information herein was provided by the Plan Trustee as of 6-30-26.

2. These shares are held in a brokerage account in Mr. Collins' name.

3. Included in this total are 30,880 shares in a ROTH IRA and 27,256.085 in a traditional IRA.

	/s/ Shirley Cantrell, Attorney-in-Fact	07/02/2026
	** 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 activity did OSBC vice chairman Gary S. Collins report on June 30, 2026?

Gary S. Collins reported updated holdings and a routine plan-related allocation. The filing shows 37 OSBC common shares were allocated to his 401(k) under the Employee Salary and Savings Plan, with no open-market buys or sells disclosed.

How many Old Second Bancorp (OSBC) shares does Gary S. Collins hold directly?

Gary S. Collins reports holding 30,136 Old Second Bancorp, Inc. common shares directly. A footnote explains these shares are held in a brokerage account in his name, separate from retirement plan and IRA holdings reported in the same filing.

What OSBC shares does Gary S. Collins hold through retirement plans and IRAs?

Collins reports 7,095 Old Second Bancorp, Inc. common shares held indirectly through a 401(k) plan and 58,136.085 shares held in IRAs, including 30,880 in a ROTH IRA and 27,256.085 in a traditional IRA, as of June 30, 2026.

How many restricted stock units does Gary S. Collins report for OSBC?

The filing lists 37,312 restricted stock units for Gary S. Collins. These RSUs represent a right to receive Old Second Bancorp, Inc. common shares in the future, subject to the company’s applicable vesting and award terms.

Did the OSBC Form 4 show any gifts, tax sales, or option exercises by Gary S. Collins?

The disclosed activity centers on a 37-share allocation to Collins’s 401(k) and updated holdings. The summary data show no gifts, tax-withholding dispositions, or option exercises, and no open-market purchases or sales in this filing.