Old Second Bancorp (OSBC) EVP sells 2,000 shares at $20.975 in Form 4 filing

Rhea-AI Filing Summary

Old Second Bancorp executive vice president Richard A. Gartelmann, Jr. reported selling 2,000 shares of Old Second Bancorp, Inc. common stock on February 5, 2026 at a price of $20.975 per share. After this sale, he directly owns 24,874 common shares, plus 12,563 shares held indirectly through a 401(k) plan and 20,552 restricted stock units.

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

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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 IL 60506

(City) (State) (Zip)

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

3. Date of Earliest Transaction (Month/Day/Year)
02/05/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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	02/05/2026		S		2,000	D	$20.975	24,874	D
Old Second Bancorp, Inc. Common Stock								12,563	I	By 401-K
Restricted Stock Units								20,552	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	02/05/2026
	** 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.

FAQ

What insider transaction did OSBC executive Richard Gartelmann report?

Richard A. Gartelmann, Jr., an EVP of Old Second Bancorp (OSBC), reported selling 2,000 shares of the company’s common stock. The sale occurred on February 5, 2026, and was disclosed on a Form 4 insider trading report filed under SEC Section 16 rules.

At what price did the OSBC insider sell Old Second Bancorp shares?

The OSBC insider sale was executed at $20.975 per share. Richard A. Gartelmann, Jr. sold 2,000 shares of Old Second Bancorp, Inc. common stock at this price, as disclosed in the Form 4 transaction details for February 5, 2026.

How many Old Second Bancorp shares does the OSBC EVP own after this sale?

After the sale, the OSBC EVP directly owns 24,874 Old Second Bancorp common shares. He also has 12,563 shares held indirectly through a 401(k) plan and 20,552 restricted stock units, reflecting additional equity-linked interests in the company.

What indirect OSBC holdings does the Old Second Bancorp EVP report?

The Old Second Bancorp EVP reports indirect ownership of 12,563 OSBC common shares through a 401(k) plan. This is in addition to his directly held shares and his separate holding of 20,552 restricted stock units tied to Old Second Bancorp stock.

Does the OSBC Form 4 include any derivative securities for Old Second Bancorp?

Yes, the OSBC Form 4 discloses 20,552 restricted stock units related to Old Second Bancorp shares. These units represent derivative equity interests that may convert into common stock under plan terms, separate from the directly and indirectly held common shares.

What role does the reporting person hold at Old Second Bancorp (OSBC)?

The reporting person, Richard A. Gartelmann, Jr., serves as an Executive Vice President at Old Second Bancorp (OSBC). His officer status and title are disclosed in the Form 4, along with details of his recent stock sale and current equity holdings.