Barry Finn of OLD SECOND BANCORP (OSBC) reports RSU grant and tax-share disposition

Rhea-AI Filing Summary

OLD SECOND BANCORP INC director Barry Finn reported equity compensation activity involving restricted stock units (RSUs) and related tax withholding. On February 17, 2026, he acquired 3,121 RSUs at $0.00 per unit as a grant under the Long Term Incentive Plan, which features three-year cliff vesting.

On February 21, 2026, 3,077 RSUs were disposed of at $20.57 per share to cover tax liabilities by delivering shares. Footnotes indicate vested RSUs were issued as common stock and added to his holdings, which include shares held outright and in a brokerage account.

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^*

Finn Barry

(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(3)	D
Old Second Bancorp, Inc. Common Stock								85,660(4)	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.

3. These shares are held in Mr. Finn's name outright.

4. These shares are held in Mr. Finn's name in a brokerage account.

	/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).
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FAQ

What insider transactions did Barry Finn report for OLD SECOND BANCORP INC (OSBC)?

Barry Finn reported a grant of 3,121 restricted stock units on February 17, 2026, and a disposition of 3,077 units on February 21, 2026, to satisfy tax obligations by delivering shares rather than selling them for cash.

How many restricted stock units did Barry Finn receive from OLD SECOND BANCORP INC (OSBC)?

Barry Finn received a grant of 3,121 restricted stock units on February 17, 2026. These units were awarded at $0.00 per unit under the company’s Long Term Incentive Plan, which is structured with a three-year cliff vesting schedule before shares fully vest.

Why were 3,077 OLD SECOND BANCORP INC (OSBC) restricted stock units disposed of?

The 3,077 restricted stock units were disposed of on February 21, 2026, at $20.57 per share to pay tax liabilities by delivering shares. This tax-withholding disposition is recorded under transaction code F rather than as an open-market sale.

What vesting terms apply to Barry Finn’s OLD SECOND BANCORP INC (OSBC) restricted stock units?

The restricted stock units granted to Barry Finn vest on a three-year cliff basis under the Long Term Incentive Plan. Footnotes state that vested units after the third anniversary are issued as common stock and added directly to his common stock holdings.

How are Barry Finn’s OLD SECOND BANCORP INC (OSBC) shares held after these transactions?

After these transactions, footnotes indicate shares are held in Barry Finn’s name either outright or in a brokerage account. Vested restricted stock units are converted into common stock, which increases his directly held common stock positions as reported in the filing.