Old Second Bancorp (OSBC) director logs RSU grant and tax share disposition

Rhea-AI Filing Summary

OLD SECOND BANCORP INC director Patti Temple Rocks reported equity compensation activity involving restricted stock units and related tax withholding. On February 17, 2026, she acquired 3,121 restricted stock units as a grant under the Old Second Bancorp, Inc. Long Term Incentive Plan, with three-year cliff vesting.

On February 21, 2026, 3,077 shares were delivered to cover tax liabilities at $20.57 per share, reducing her restricted stock unit holdings to 10,595 units held directly. Following these transactions, she also reported 20,351 shares of Old Second Bancorp common stock held directly and 18,678.85 shares held indirectly through an IRA.

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

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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^*

Temple Rocks Patti

(Last) (First) (Middle)

580 CREEKSIDE DRIVE

(Street)

GENEVA IL 60134

(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								20,351(3)	D
Old Second Bancorp, Inc. Common Stock								18,678.85	I	IRA

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 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.

3. These shares are held in Ms. Rocks name 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 OSBC director Patti Temple Rocks report?

Patti Temple Rocks reported a grant of 3,121 restricted stock units and a disposition of 3,077 shares to cover tax liabilities. These transactions reflect routine equity compensation and related tax withholding, not open-market buying or selling of Old Second Bancorp (OSBC) shares.

How many restricted stock units did OSBC grant to Patti Temple Rocks?

Old Second Bancorp (OSBC) granted Patti Temple Rocks 3,121 restricted stock units on February 17, 2026. The units were issued under the company’s Long Term Incentive Plan and carry three-year cliff vesting, meaning they vest all at once after three years, not gradually.

Why were 3,077 OSBC shares disposed of in this Form 4 filing?

The 3,077 Old Second Bancorp (OSBC) shares were delivered to satisfy tax liabilities related to vesting equity. The transaction used existing securities at $20.57 per share, reflecting tax-withholding disposition rather than an open-market sale initiated for investment purposes.

What are Patti Temple Rocks’ OSBC equity holdings after these transactions?

After the reported transactions, Patti Temple Rocks directly holds 10,595 restricted stock units and 20,351 shares of Old Second Bancorp common stock. She also indirectly owns 18,678.85 OSBC shares held through an IRA, reflecting both direct and retirement-related ownership positions.

How do the OSBC restricted stock units for Patti Temple Rocks vest?

The restricted stock units granted to Patti Temple Rocks by Old Second Bancorp (OSBC) vest on a three-year cliff schedule. This means the entire grant becomes exercisable at once on the third anniversary of the grant date, rather than vesting in annual or quarterly installments.

Is the Form 4 activity for OSBC’s Patti Temple Rocks a buy or sell signal?

The Form 4 activity reflects equity awards and tax withholding, not open-market trades. She received 3,121 restricted stock units and had 3,077 shares delivered to cover taxes. These compensation-related entries do not represent discretionary buying or selling of OSBC shares in the market.