[Form 3] Old Second Bancorp Inc Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

SEC Form 3 filing: On 8 July 2025, Darin Patrick Campbell submitted an Initial Statement of Beneficial Ownership for Old Second Bancorp Inc. (OSBC).

The filing follows the 1 July 2025 merger of Bancorp Financial Inc. into Old Second Bancorp. Campbell, now both a Director and President, Powersports Lending, reports a fixed and irrevocable right—under the merger agreement—to receive 309,680 shares of OSBC common stock. These shares represent the conversion of his 119,966 Bancorp Financial shares at the agreed exchange ratio.

No derivative securities were disclosed, and the shares are listed as direct ownership. The disclosure increases transparency around insider ownership created by the merger and aligns the new executive’s interests with OSBC shareholders.

Positive

• 309,680 shares of direct OSBC ownership by a new Director/Officer strengthens management–shareholder alignment.
• Filing confirms conversion mechanics of the Bancorp Financial merger, indicating post-deal integration progress.

Negative

• None.

Insights

Financial Analyst

TL;DR New OSBC director/officer to obtain 309,680 shares via Bancorp merger; signals insider alignment, but limited standalone financial impact.

Assessment: The Form 3 identifies a sizeable insider stake for Darin Patrick Campbell stemming from the Bancorp Financial merger. While insider ownership generally supports shareholder alignment, the filing does not alter earnings, capital, or guidance. It mainly confirms merger mechanics and integrates a key executive with meaningful skin in the game. Investors may view the disclosure as modestly positive for governance, yet the absence of derivative positions or additional transactions keeps the market impact neutral.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
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hours per response:			0.5

1. Name and Address of Reporting Person^*

Campbell Darin Patrick

(Last) (First) (Middle)

37 S. RIVER ST.

(Street)

AURORA IL 60506

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
07/01/2025

3. Issuer Name and Ticker or Trading Symbol
OLD SECOND BANCORP INC [ OSBC ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President, Powersports Lending

5. 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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Old Second Bancorp, Inc. Common Stock	309,680(1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. These securities are issuable pursuant to the merger of Bancorp Financial, Inc. with and into Old Second Bancorp, Inc., which became effective on July 1, 2025. The reporting person held 119,966 shares of Bancorp Financial, Inc., which pursuant to the merger agreement, will be converted into 309,680 shares of Old Second Bancorp, Inc. common stock. The exchange of shares has not yet occurred, but the right to receive the shares is fixed and irrevocable under the merger agreement.

	/s/ Shirley Cantrell, Attorney-in-Fact	07/08/2025
	** 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 5 (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

How many OSBC shares will Darin Patrick Campbell own?

The Form 3 reports a right to receive 309,680 shares of Old Second Bancorp common stock.

What event triggered this Form 3 filing for OSBC?

The 1 July 2025 merger of Bancorp Financial Inc. into Old Second Bancorp created Campbell’s fixed right to OSBC shares.

What positions does Campbell hold at Old Second Bancorp (OSBC)?

He is listed as both a Director and Officer – President, Powersports Lending.

Were any derivative securities reported in the filing?

No. The Form 3 shows no derivative securities held by the reporting person.

Has the share exchange already occurred?

Not yet. The filing states that the right to receive the shares is fixed, but the actual exchange is still pending.