Old Second Bancorp director awarded 3,121 RSUs

Old Second Bancorp director Billy J. Lyons Jr. received a grant of 3,121 Restricted Stock Units on February 17 under the company’s Long Term Incentive Plan, with three-year cliff vesting.

Accepted by SEC EDGAR 02/24/2026 - 07:19 PM EST Learn about SEC filing dates

The filer has since corrected this document, so the figures below are the ones originally reported and some of them may have changed. Read the amended Form 4/A for what the company says now.

Rhea-AI Filing Summary

Old Second Bancorp director Billy J. Lyons Jr. received a grant of 3,121 Restricted Stock Units on February 17 under the company’s Long Term Incentive Plan, with three-year cliff vesting. On February 21, 3,077 units were disposed of to cover tax withholding at $20.57 per share. Following these transactions, he directly holds 10,595 restricted stock units and 20,073 shares of Old Second Bancorp common stock.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Lyons Billy J Jr.

Role Director

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Restricted Stock Units	3,077	$20.57	$63K
Grant/Award	Restricted Stock Units	3,121	$0.00	$0.00
Holding	Old Second Bancorp, Inc. Common Stock	--	--	--

Holdings After Transaction: Restricted Stock Units — 10,595 shares (Direct); Old Second Bancorp, Inc. Common Stock — 20,073 shares (Direct)

Footnotes (3)

1. F1. 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. F2. 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. F3. Included in this total are 8,643 shares held with a broker and 11,430 shares held in Mr. Lyons' name outright.

FAQ

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

What insider transactions did Old Second Bancorp (OSBC) report for Billy J. Lyons Jr.?

Old Second Bancorp (OSBC) reported that director Billy J. Lyons Jr. received 3,121 Restricted Stock Units and had 3,077 units disposed of to satisfy tax withholding obligations. These movements relate to equity compensation rather than open-market buying or selling activity.

How many Restricted Stock Units did OSBC’s Billy J. Lyons Jr. receive and on what terms?

Billy J. Lyons Jr. received 3,121 Restricted Stock Units under Old Second Bancorp’s Long Term Incentive Plan. The award carries a three-year cliff vesting schedule, meaning all units vest together after three years rather than gradually over time.

Was there a stock sale by the OSBC director in this Form 4 filing?

The filing shows a tax-withholding disposition of 3,077 Restricted Stock Units at $20.57 per share, not an open-market sale. These units were withheld to cover tax obligations when previously granted awards vested and converted into common stock holdings.

What are Billy J. Lyons Jr.’s OSBC holdings after these Form 4 transactions?

After the reported transactions, Billy J. Lyons Jr. directly holds 10,595 Restricted Stock Units and 20,073 shares of Old Second Bancorp common stock. The common stock total includes shares held with a broker and shares registered in his name outright.

How do the OSBC Restricted Stock Units vest for Billy J. Lyons Jr.?

The Restricted Stock Units granted to Billy J. Lyons Jr. under Old Second Bancorp’s Long Term Incentive Plan have three-year cliff vesting. All the granted units vest at the end of three years, at which point they convert into common stock shares for him.

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

Form 4 Insider Transactions: What Each Field Means →

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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^*

Lyons Billy J Jr.

(Last) (First) (Middle)

37 SOUTH RIVER STREET

(Street)

AURORA IL 60507

(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								20,073(3)	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 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. Included in this total are 8,643 shares held with a broker and 11,430 shares held in Mr. Lyons' 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).
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