Old Second Bancorp CEO acquires 92 savings-plan shares

Plan allocations were reported alongside 303,399 directly held common shares and 188,252 restricted stock units as of September 30, 2026.

Rhea-AI Filing Summary

James Eccher reported acquisition or exercise transactions in this Form 4 filing. Old Second Bancorp Inc. Chairman and CEO James Eccher reported 17 shares allocated during the third quarter pursuant to the Profit Sharing Plan and Trust and 92 shares pursuant to the Employee Savings Plan & Trust. The plan trustees provided information as of September 30, 2026. Reported post-allocation positions were 6,395 shares through Profit Sharing and 33,590 shares through the 401-K. Eccher also reported 303,399 directly held common shares, including 148 held jointly with his spouse and 303,251 in a brokerage account, plus 188,252 restricted stock units.

Insider Trade Summary

Other: 109 shares

Other 4 txns

Insider Eccher James

Role CHAIRMAN AND CEO

Type	Security	Shares	Price	Value
Other	Old Second Bancorp, Inc. Common Stock F1	17	$0.00	$0.00
Other	Old Second Bancorp, Inc. Common Stock F2	92	$0.00	$0.00
holding	Old Second Bancorp, Inc. Common Stock F3	--	--	--
holding	Restricted Stock Units	--	--	--

Holdings After Transaction: Old Second Bancorp, Inc. Common Stock — 6,395 shares (Indirect, By Profit Sharing); Old Second Bancorp, Inc. Common Stock — 33,590 shares (Indirect, By 401-K); Old Second Bancorp, Inc. Common Stock — 303,399 shares (Direct); Restricted Stock Units — 188,252 shares (Direct)

Footnotes (3)

1. F1. These shares were allocated during the third quarter pursuant to the Old Second Bancorp, Inc. Profit Sharing Plan and Trust. Information herein was provided by the Plan Trustee as of 9-30-26.
2. F2. These shares were allocated during the third quarter pursuant to the Old Second Bancorp, Inc. Employee Savings Plan & Trust. Information herein was provided by the Plan Trustee as of 9-30-26.
3. F3. Included in this total are 148 shares held jointly with spouse and 303,251 shares held in a brokerage account.

Key Figures

Profit Sharing Plan allocation: 17 shares Employee Savings Plan allocation: 92 shares Shares through Profit Sharing after allocation: 6,395 shares +5 more

8 metrics

Profit Sharing Plan allocation 17 shares Allocated during the third quarter; trustee information as of September 30, 2026.

Employee Savings Plan allocation 92 shares Allocated during the third quarter; trustee information as of September 30, 2026.

Shares through Profit Sharing after allocation 6,395 shares Reported position following the September 30, 2026 transaction.

Shares through 401-K after allocation 33,590 shares Reported position following the September 30, 2026 transaction.

Directly held common shares 303,399 shares Reported as of September 30, 2026; includes jointly held and brokerage-account shares.

Common shares held jointly with spouse 148 shares Included in the reported total of directly held common shares.

Common shares in brokerage account 303,251 shares Included in the reported total of directly held common shares.

Restricted Stock Units 188,252 units Reported holding as of September 30, 2026.

Key Terms

Profit Sharing Plan and Trust, Employee Savings Plan & Trust, Restricted Stock Units

3 terms

Profit Sharing Plan and Trust financial

"allocated during the third quarter pursuant to the Old Second Bancorp, Inc. Profit Sharing Plan and Trust"

Employee Savings Plan & Trust financial

"allocated during the third quarter pursuant to the Old Second Bancorp, Inc. Employee Savings Plan & Trust"

Restricted Stock Units financial

"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.

FAQ

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

What OSBC share allocations did James Eccher report?

The reported allocations were 17 shares during the third quarter pursuant to the Profit Sharing Plan and Trust and 92 shares pursuant to the Employee Savings Plan & Trust. The plan trustees provided information as of September 30, 2026.

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

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Available on EDGAR 10/01/2026 - 02:28 PM Accepted by SEC EDGAR 10/01/2026 - 02:27 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^*

Eccher James

(Last) (First) (Middle)

37 S. RIVER ST.

(Street)

AURORA ILLINOIS 60506

(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
X	Officer (give title below)		Other (specify below)
	CHAIRMAN AND CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/30/2026

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	09/30/2026		J		17(1)	A	$0	6,395	I	By Profit Sharing
Old Second Bancorp, Inc. Common Stock	09/30/2026		J		92(2)	A	$0	33,590	I	By 401-K
Old Second Bancorp, Inc. Common Stock								303,399(3)	D
Restricted Stock Units								188,252	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 shares were allocated during the third quarter pursuant to the Old Second Bancorp, Inc. Profit Sharing Plan and Trust. Information herein was provided by the Plan Trustee as of 9-30-26.

2. These shares were allocated during the third quarter pursuant to the Old Second Bancorp, Inc. Employee Savings Plan & Trust. Information herein was provided by the Plan Trustee as of 9-30-26.

3. Included in this total are 148 shares held jointly with spouse and 303,251 shares held in a brokerage account.

	/s/ Shirley Cantrell, Attorney-in-Fact	10/01/2026
	** 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)