OSBC EVP updates stock and RSU holdings

OLD SECOND BANCORP INC executive Richard A. Gartelmann Jr., an EVP, reported updated holdings and a small plan-related allocation of company stock.

Rhea-AI Filing Summary

OLD SECOND BANCORP INC executive Richard A. Gartelmann Jr., an EVP, reported updated holdings and a small plan-related allocation of company stock. A Form 4 entry shows 42 shares of Old Second Bancorp, Inc. common stock were allocated during the second quarter under the company’s Employee Salary and Savings Plan, based on information from the plan trustee as of June 30, 2026.

Following these updates, he directly holds 21,294 Restricted Stock Units and 29,551 shares of common stock, and indirectly holds 12,648 shares of common stock through a 401(k) plan. The filing reflects compensation and retirement-plan activity rather than open-market trading.

Insider Trade Summary

Other: 42 shares

Other 3 txns

Insider Gartelmann Richard A JR

Role EVP

Type	Security	Shares	Price	Value
Other	Old Second Bancorp, Inc. Common Stock	42	$0.00	$0.00
holding	Old Second Bancorp, Inc. Common Stock	--	--	--
holding	Restricted Stock Units	--	--	--

Holdings After Transaction: Old Second Bancorp, Inc. Common Stock — 12,648 shares (Indirect, By 401-K); Old Second Bancorp, Inc. Common Stock — 29,551 shares (Direct); Restricted Stock Units — 21,294 shares (Direct)

Footnotes (1)

1. F1. Of this total, 42 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.

Key Figures

Plan allocation: 42 shares Direct RSU holdings: 21,294 RSUs Direct common stock holdings: 29,551 shares +2 more

5 metrics

Plan allocation 42 shares Allocated in Q2 under Employee Salary and Savings Plan

Direct RSU holdings 21,294 RSUs Restricted Stock Units held directly as of June 30, 2026

Direct common stock holdings 29,551 shares Old Second Bancorp, Inc. common stock held directly as of June 30, 2026

Indirect 401(k) holdings 12,648 shares Old Second Bancorp, Inc. common stock held indirectly by 401-K

Restructuring transaction 42 shares J-code other acquisition or disposition linked to 401-K plan

Key Terms

Restricted Stock Units, Employee Salary and Savings Plan, Form 4, indirect, +1 more

5 terms

Restricted Stock Units financial

""security_title": "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.

Employee Salary and Savings Plan financial

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

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

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.

indirect financial

""ownership_type": "indirect""

401-K financial

""nature_of_ownership": "By 401-K""

FAQ

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

What did OSBC EVP Richard Gartelmann report in this Form 4?

He reported updated holdings and a small allocation of Old Second Bancorp, Inc. common stock. 42 shares were allocated to his account under the company’s Employee Salary and Savings Plan during the second quarter, and his direct and indirect holdings were updated accordingly.

How many Old Second Bancorp (OSBC) RSUs does Richard Gartelmann hold?

After the reported changes, he holds 21,294 Restricted Stock Units directly. Restricted Stock Units are share-based compensation that typically convert into common stock over time, tying a portion of executive pay to the company’s long-term performance and share value.

What are Richard Gartelmann’s direct OSBC common stock holdings after this filing?

The Form 4 shows he directly owns 29,551 shares of Old Second Bancorp, Inc. common stock as of June 30, 2026. These shares are separate from his Restricted Stock Units and represent his direct equity stake in the company’s stock.

What does the 42-share transaction in Richard Gartelmann’s OSBC 401(k) represent?

The 42 shares were allocated in the second quarter under Old Second Bancorp’s Employee Salary and Savings Plan. According to the trustee, this reflects plan activity in his 401(k), not an open-market purchase or sale directed by him personally.

How many OSBC shares does Richard Gartelmann hold indirectly through his 401(k)?

Following the reported plan allocation, he indirectly holds 12,648 shares of Old Second Bancorp, Inc. common stock through a 401(k) arrangement. These shares are recorded as indirect ownership, labeled “By 401-K” in the Form 4 filing.

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

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Accepted by SEC EDGAR 07/02/2026 - 09:55 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^*

Gartelmann Richard A JR

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP

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		42(1)	A	$0	12,648	I	By 401-K
Old Second Bancorp, Inc. Common Stock								29,551	D
Restricted Stock Units								21,294	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, 42 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.

	/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)