Old Second Bancorp EVP acquires 35 shares in Q3

Q: How many OSBC shares were allocated to Richard A. Gartelmann Jr.'s 401-K?

35 common shares were allocated during the third quarter under the Old Second Bancorp, Inc. Employee Savings Plan & Trust. The Plan Trustee provided the information as of September 30, 2026.

Q: What OSBC holdings did Richard A. Gartelmann Jr. report after the allocation?

The reported holdings included 12,683 common shares through the 401-K, 29,551 directly held common shares and 21,294 restricted stock units, as of September 30, 2026.

Reported positions include 12,683 shares through the 401-K, 29,551 directly held common shares and 21,294 restricted stock units.

Filing Impact

(Neutral)

Filing Sentiment

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Form Type

Rhea-AI Filing Summary

Old Second Bancorp Inc. EVP Richard A. Gartelmann Jr. reported an acquisition of 35 common shares allocated during the third quarter to a 401-K under the Old Second Bancorp, Inc. Employee Savings Plan & Trust. The Plan Trustee provided the information as of September 30, 2026. His reported holdings after the transaction included 12,683 common shares through the 401-K, 29,551 directly held common shares and 21,294 restricted stock units.

Insider Trade Summary

Other: 35 shares

Other 3 txns

Insider Gartelmann Richard A JR

Role EVP

Type	Security	Shares	Price	Value
Other	Old Second Bancorp, Inc. Common Stock ^F1	35	$0.00	$0.00
holding	Old Second Bancorp, Inc. Common Stock	--	--	--
holding	Restricted Stock Units	--	--	--

Holdings After Transaction: Old Second Bancorp, Inc. Common Stock — 12,683 shares (Indirect, By 401-K); Old Second Bancorp, Inc. Common Stock — 29,551 shares (Direct); Restricted Stock Units — 21,294 shares (Direct)

Footnotes (1)

F1. These shares were allocated during the third quarter pursuant to the Old Second Bancorp, Inc. Employee Savings Plan & Trust. Information herein was provided by the Plan Trustee as of 9-30-26.

Key Figures

Common shares allocated: 35 shares Common shares through 401-K: 12,683 shares Direct common shares: 29,551 shares +1 more

4 metrics

Common shares allocated 35 shares Allocated during the third quarter; as of September 30, 2026

Common shares through 401-K 12,683 shares Following the transaction, as of September 30, 2026

Direct common shares 29,551 shares As of September 30, 2026

Restricted Stock Units 21,294 units As of September 30, 2026

Key Terms

Employee Savings Plan & Trust, 401-K, Restricted Stock Units

3 terms

Employee Savings Plan & Trust financial

"pursuant to the Old Second Bancorp, Inc. Employee Savings Plan & Trust"

401-K financial

"By 401-K"

Restricted Stock Units financial

"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.

FAQ

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

How many OSBC shares were allocated to Richard A. Gartelmann Jr.'s 401-K?

35 common shares were allocated during the third quarter under the Old Second Bancorp, Inc. Employee Savings Plan & Trust. The Plan Trustee provided the information as of September 30, 2026.

What OSBC holdings did Richard A. Gartelmann Jr. report after the allocation?

The reported holdings included 12,683 common shares through the 401-K, 29,551 directly held common shares and 21,294 restricted stock units, as of September 30, 2026.

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

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 10/01/2026 - 02:21 PM Accepted by SEC EDGAR 10/01/2026 - 02:21 PM

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)
09/30/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Old Second Bancorp, Inc. Common Stock	09/30/2026		J		35⁽¹⁾	A	$0	12,683	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. These shares were allocated during the third quarter pursuant to the Old Second Bancorp, Inc. Employee Savings Plan & Trust. Information herein was provided by the Plan Trustee as of 9-30-26.

	/s/ Shirley Cantrell, Attorney-in-Fact	10/01/2026
	** 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)

Source: View Original Filing on SEC EDGAR