Old Second CFO reports performance-based share vesting

Old Second Bancorp CFO & COO Bradley S. Adams reported equity transactions in Old Second Bancorp, Inc. Common Stock.

Rhea-AI Filing Summary

Old Second Bancorp CFO & COO Bradley S. Adams reported equity transactions in Old Second Bancorp, Inc. Common Stock. He acquired 15,657 shares on March 2, 2026 as a grant/award tied to performance-based restricted stock units under the 2019 Equity Incentive Plan, after performance exceeded target levels for the applicable period.

On the same date, 4,587 shares at $19.91 per share were withheld by the issuer to cover applicable tax obligations related to the vesting of 15,657 performance-based units, with the remaining shares added to his common stock holdings. Following these transactions, he directly owned 160,401 common shares, held 10,202 shares indirectly through a 401-k plan, and held 84,980 restricted stock units.

Insider Trade Summary

4 transactions reported

Mixed 4 txns

Insider ADAMS BRADLEY S.

Role CFO & COO

Type	Security	Shares	Price	Value
Grant/Award	Old Second Bancorp, Inc. Common Stock	15,657	$0.00	$0.00
Exercise Price or Tax Liability	Old Second Bancorp, Inc. Common Stock	4,587	$19.91	$91K
holding	Old Second Bancorp, Inc. Common Stock	--	--	--
holding	Restricted Stock Units	--	--	--

Holdings After Transaction: Old Second Bancorp, Inc. Common Stock — 160,401 shares (Direct); Old Second Bancorp, Inc. Common Stock — 10,202 shares (Indirect, By 401-k Plan); Restricted Stock Units — 84,980 shares (Direct)

Footnotes (3)

1. F1. Shares delivered to the reporting person pursuant to vesting of performance-based restricted stock units granted under the Old Second Bancorp, Inc. 2019 Equity Incentive Plan, as Amended and Restated and vested upon achievement of performance goals for the applicable performance period. The reporting person reported an acquisition of 8,946 on Form 4 filed February 21, 2023, which represented the number of shares that would be delivered if target performance was achieved during the performance period. Actual performance exceeded the target performance for the performance period which resulted in an additional grant of 6,711 shares.
2. F2. Represents shares withheld by the issuer to satisfy applicable tax withholding obligations in connection with the vesting of 15,657 previously reported performance-based restricted stock units, the remaining shares of which were issued and added to the reporting person's common stock holdings.
3. F3. Included in this total are 75,300 shares held by the reporting person jointly with a spouse at a brokerage firm and 85,101 shares held jointly with spouse outright,

FAQ

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

What did OSBC executive Bradley S. Adams report in this Form 4 filing?

Bradley S. Adams reported performance-based share vesting and related tax withholding. He received 15,657 Old Second Bancorp shares from performance-based restricted stock units, while 4,587 shares were withheld at $19.91 per share to cover taxes, with the remaining shares added to his direct holdings.

How many Old Second Bancorp (OSBC) shares did the CFO acquire in the latest grant?

The CFO acquired 15,657 Old Second Bancorp common shares through vesting. These shares came from performance-based restricted stock units granted under the 2019 Equity Incentive Plan, with actual performance exceeding target levels and resulting in an additional 6,711 shares beyond the originally reported target amount.

Were any OSBC shares sold by Bradley S. Adams in this Form 4?

No open-market sale was reported; shares were withheld for taxes. A total of 4,587 Old Second Bancorp shares were withheld by the issuer at $19.91 per share to satisfy tax obligations arising from vesting of 15,657 performance-based restricted stock units.

What are Bradley S. Adams’ direct OSBC common stock holdings after these transactions?

After the transactions, he directly held 160,401 OSBC common shares. This total reflects the addition of vested performance-based shares net of tax-withholding shares, and includes shares held jointly with his spouse at a brokerage firm and jointly outright, as described in the footnotes.

How many Old Second Bancorp (OSBC) shares does Adams hold indirectly through a 401-k plan?

Adams held 10,202 Old Second Bancorp shares indirectly via a 401-k plan. This indirect ownership is reported separately from his direct common stock holdings and reflects shares held in a retirement plan account associated with him.

What restricted stock unit (RSU) balance does the OSBC CFO report after the transactions?

Following the reported events, Adams held 84,980 restricted stock units. These RSUs are separate from his common stock and represent additional potential future share deliveries, subject to applicable vesting and plan terms described in the equity incentive plan.

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

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Accepted by SEC EDGAR 03/04/2026 - 02:54 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^*

ADAMS BRADLEY S.

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
03/02/2026

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
Old Second Bancorp, Inc. Common Stock	03/02/2026		A		15,657(1)	A	$0	164,988	D
Old Second Bancorp, Inc. Common Stock	03/02/2026		F		4,587(2)	D	$19.91	160,401(3)	D
Old Second Bancorp, Inc. Common Stock								10,202	I	By 401-k Plan
Restricted Stock Units								84,980	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. Shares delivered to the reporting person pursuant to vesting of performance-based restricted stock units granted under the Old Second Bancorp, Inc. 2019 Equity Incentive Plan, as Amended and Restated and vested upon achievement of performance goals for the applicable performance period. The reporting person reported an acquisition of 8,946 on Form 4 filed February 21, 2023, which represented the number of shares that would be delivered if target performance was achieved during the performance period. Actual performance exceeded the target performance for the performance period which resulted in an additional grant of 6,711 shares.

2. Represents shares withheld by the issuer to satisfy applicable tax withholding obligations in connection with the vesting of 15,657 previously reported performance-based restricted stock units, the remaining shares of which were issued and added to the reporting person's common stock holdings.

3. Included in this total are 75,300 shares held by the reporting person jointly with a spouse at a brokerage firm and 85,101 shares held jointly with spouse outright,

	/s/ Shirley Cantrell, Attorney-in-Fact	03/04/2026
	** 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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