Old Second Bancorp (OSBC) director logs Jan. 15 stock sales in Form 4

Rhea-AI Filing Summary

Old Second Bancorp director John Ladowicz reported sales of Old Second Bancorp, Inc. common stock on January 15, 2026. Two transactions were reported from IRA accounts: one sale of 2,897 shares at $20.941 per share and another sale of 1,865 shares at $20.96 per share.

After these sales, the filing shows IRA holdings of 146,757 shares and 144,892 shares, reported as indirectly owned, and an additional 36,121 shares reported as directly owned. Ladowicz is identified in the filing as a director of Old Second Bancorp.

Insider Trade Summary

Net Seller: 4,762 shares ($99,756)

Net Sell 3 txns

Insider Ladowicz John

Role Director

Sold 4,762 shs ($100K)

Type	Security	Shares	Price	Value
Sale	Old Second Bancorp, Inc. Common Stock	2,897	$20.941	$61K
Sale	Old Second Bancorp, Inc. Common Stock	1,865	$20.96	$39K
holding	Old Second Bancorp, Inc. Common Stock	--	--	--

Holdings After Transaction: Old Second Bancorp, Inc. Common Stock — 146,757 shares (Indirect, IRA); Old Second Bancorp, Inc. Common Stock — 36,121 shares (Direct)

Footnotes (1)

Form 4 Insider Transactions: What Each Field Means →

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

X

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^*

Ladowicz John

(Last) (First) (Middle)

8950 WILDLIFE LOOP

(Street)

SARASOTA FL 34238

(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)
01/15/2026

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	01/15/2026		S		2,897	D	$20.941	146,757	I	IRA
Old Second Bancorp, Inc. Common Stock	01/15/2026		S		1,865	D	$20.96	144,892	I	IRA
Old Second Bancorp, Inc. Common Stock								36,121	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:

	/s/ Shirley Cantrell, Attorney-in-Fact	01/16/2026
	** 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.

FAQ

What insider activity did OSBC director John Ladowicz report?

Director John Ladowicz reported selling Old Second Bancorp, Inc. common stock on January 15, 2026 from IRA accounts, as disclosed in a Form 4 filing.

How many Old Second Bancorp (OSBC) shares were sold in the reported transactions?

The filing shows two sales: one of 2,897 shares and another of 1,865 shares of Old Second Bancorp, Inc. common stock.

At what prices did the OSBC insider share sales occur?

The 2,897-share sale was reported at $20.941 per share, and the 1,865-share sale was reported at $20.96 per share.

How many OSBC shares does John Ladowicz report holding after the transactions?

Following the reported sales, the filing lists IRA holdings of 146,757 shares and 144,892 shares indirectly owned, plus 36,121 shares reported as directly owned.

Are the reported OSBC share transactions direct or indirect holdings?

The two sales of 2,897 and 1,865 shares are reported as indirect holdings through IRA accounts. The 36,121 shares are reported as directly owned.

What is John Ladowicz’s relationship to Old Second Bancorp (OSBC)?

The filing identifies John Ladowicz as a director of Old Second Bancorp, Inc.