Old Second (OSBC) director awarded RSUs, with shares used to cover taxes

Rhea-AI Filing Summary

OLD SECOND BANCORP INC director Keith Kotche reported equity compensation activity and related tax withholding. On February 17, 2026, he acquired 3,121 Restricted Stock Units at a price of $0.00 per unit as a grant/award under the Old Second Bancorp, Inc. Long Term Incentive Plan. A footnote states these restricted stock units have a three-year cliff vesting schedule.

On February 21, 2026, 3,077 Restricted Stock Units were disposed of at $20.57 per share in a tax-withholding disposition to satisfy tax obligations upon vesting. Following this tax-related disposition, Kotche directly owned 10,595 Restricted Stock Units. Separate holding entries show direct ownership of Old Second Bancorp, Inc. common stock totaling 184,384 shares as of February 17, 2026, with an additional line reflecting 3,077 shares of common stock.

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^*

Kotche Keith

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
02/17/2026

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
Restricted Stock Units	02/17/2026		A		3,121(1)	A	$0	13,672	D
Restricted Stock Units	02/21/2026		F		3,077(2)	D	$20.57	10,595	D
Old Second Bancorp, Inc. Common Stock								3,077	D
Old Second Bancorp, Inc. Common Stock								184,384	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. These shares represent restricted stock units granted pursuant to the Old Second Bancorp, Inc. Long Term Incentive Plan. These shares have a three-year cliff vesting.

2. Represents shares vested upon the third anniversary of the date of grant previously reported and are now issued and added to the reporting person's common stock holdings outright.

	/s/ Shirley Cantrell, Attorney-in-Fact	02/24/2026
	** 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 transactions did Keith Kotche report for OLD SECOND BANCORP (OSBC)?

Keith Kotche reported a grant of 3,121 Restricted Stock Units and a separate tax-withholding disposition of 3,077 Restricted Stock Units. Both transactions involved equity awarded under Old Second Bancorp’s Long Term Incentive Plan and did not reflect open-market buying or selling.

How many Restricted Stock Units did Keith Kotche receive in the latest OSBC Form 4?

Keith Kotche received 3,121 Restricted Stock Units at a stated price of $0.00 per unit. The award was granted under Old Second Bancorp, Inc.’s Long Term Incentive Plan and is subject to a three-year cliff vesting schedule, according to the filing footnotes.

Why were 3,077 OSBC Restricted Stock Units disposed of in Keith Kotche’s Form 4?

The 3,077 Restricted Stock Units were disposed of as a tax-withholding transaction at $20.57 per share. This means shares were withheld to cover tax obligations when previously granted units vested, rather than being sold in an open-market trade.

What are Keith Kotche’s OSBC Restricted Stock Unit holdings after these transactions?

After the reported grant and tax-withholding disposition, Keith Kotche directly held 10,595 Restricted Stock Units. These units arise from awards under Old Second Bancorp’s Long Term Incentive Plan and are subject to vesting terms described in the filing’s footnotes.

How many OLD SECOND BANCORP (OSBC) common shares does Keith Kotche hold directly?

The filing shows direct ownership entries of Old Second Bancorp, Inc. common stock totaling 184,384 shares, along with a separate line showing 3,077 shares. These figures reflect reported direct holdings as of the February 17, 2026 transaction date.

Does Keith Kotche’s OSBC Form 4 show open-market buying or selling of shares?

The Form 4 does not report open-market purchases or sales. It details a grant of 3,121 Restricted Stock Units and a tax-withholding disposition of 3,077 units, where shares were withheld to satisfy tax liabilities tied to vesting.