Old Second Bancorp director receives 20-share stock award

OLD SECOND BANCORP INC director Billy J. Lyons Jr. reported an acquisition of 20 shares of Old Second Bancorp, Inc. common stock on 2026-08-10 as a grant or award at $25.38 per share, bringing his direct common stock holdings to 20,117 shares.

Rhea-AI Filing Summary

OLD SECOND BANCORP INC director Billy J. Lyons Jr. reported an acquisition of 20 shares of Old Second Bancorp, Inc. common stock on 2026-08-10 as a grant or award at $25.38 per share, bringing his direct common stock holdings to 20,117 shares. A footnote states this total includes 8,687 shares held with a broker and 11,430 shares held in his name outright. He also reports a direct holding of 10,595 Restricted Stock Units, which are tracked separately from the common shares.

Insider Trade Summary

Grant/Award: 20 shares

Grant/Award 2 txns

Insider Lyons Billy J Jr.

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Old Second Bancorp, Inc. Common Stock F1	20	$25.38	$507.60
holding	Restricted Stock Units	--	--	--

Holdings After Transaction: Old Second Bancorp, Inc. Common Stock — 20,117 shares (Direct); Restricted Stock Units — 10,595 shares (Direct)

Footnotes (1)

1. F1. Included in this total are 8,687 shares held with a broker and 11,430 shares held in Mr. Lyons' name outright.

Key Figures

Shares awarded: 20 shares Award price: $25.38 per share Common shares held after: 20,117 shares +3 more

6 metrics

Shares awarded 20 shares Grant or award of Old Second Bancorp, Inc. common stock on 2026-08-10

Award price $25.38 per share Per-share value assigned to the 20-share common stock grant

Common shares held after 20,117 shares Direct holdings of Old Second Bancorp, Inc. common stock following the award

Broker-held shares 8,687 shares Portion of post-transaction common stock held with a broker

Outright-held shares 11,430 shares Portion of post-transaction common stock held in Mr. Lyons' name outright

Restricted Stock Units held 10,595 units Direct holdings of Restricted Stock Units reported as of 2026-08-10

Key Terms

Restricted Stock Units, grant or award, held with a broker

3 terms

Restricted Stock Units financial

"He also reports a direct holding of 10,595 Restricted Stock Units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

grant or award financial

"reported an acquisition of 20 shares of common stock as a grant or award"

held with a broker financial

"Included in this total are 8,687 shares held with a broker"

FAQ

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

What transaction did OSBC director Billy J. Lyons Jr. report on this Form 4?

Billy J. Lyons Jr. reported a grant or award of 20 shares of Old Second Bancorp, Inc. common stock on 2026-08-10, recorded at $25.38 per share, increasing his directly held common stock position.

How many OSBC common shares does Billy J. Lyons Jr. hold after this transaction?

After the reported award, Billy J. Lyons Jr. directly holds 20,117 shares of Old Second Bancorp, Inc. common stock. According to a footnote, this includes 8,687 shares with a broker and 11,430 shares held outright in his name.

What price was used for the 20-share award to the OSBC director?

The 20-share grant to the OSBC director was recorded at $25.38 per share. This price is disclosed as a per-share value for the awarded Old Second Bancorp, Inc. common stock on the transaction date.

Does Billy J. Lyons Jr. hold Restricted Stock Units of OSBC in addition to common shares?

Yes. In addition to common shares, Billy J. Lyons Jr. reports holding 10,595 Restricted Stock Units directly. These RSUs represent a separate equity-based holding distinct from his 20,117 directly held common shares of Old Second Bancorp, Inc.

How are Billy J. Lyons Jr.’s OSBC common shares allocated between broker and outright holdings?

A footnote explains that his 20,117 common shares consist of 8,687 shares held with a broker and 11,430 shares held outright in his own name, clarifying the composition of his reported direct ownership.

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

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Available on EDGAR 08/11/2026 - 12:48 PM Accepted by SEC EDGAR 08/11/2026 - 12:47 PM Learn about SEC filing dates

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 ILLINOIS 60507

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/10/2026

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

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

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

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	08/10/2026		A		20	A	$25.38	20,117(1)	D
Restricted Stock Units								10,595	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. Included in this total are 8,687 shares held with a broker and 11,430 shares held in Mr. Lyons' name outright.

	/s/ Shirley Cantrell, Attorney-in-Fact	08/11/2026
	** 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.
* Form 4: SEC 1474 (03-26)