Old Second Bancorp CEO sells 19,313 shares

Old Second Bancorp, Inc. director and Chairman/CEO James Eccher reported a sale of 19,313 shares of common stock on August 12, 2026 in an open-market transaction under a Rule 10b5-1 trading plan adopted on May 1, 2026.

Rhea-AI Filing Summary

Old Second Bancorp, Inc. director and Chairman/CEO James Eccher reported a sale of 19,313 shares of common stock on August 12, 2026 in an open-market transaction under a Rule 10b5-1 trading plan adopted on May 1, 2026. The weighted average sale price was $25.6149 per share, with individual trades between $25.48 and $25.79. Following this sale, Eccher directly holds 303,399 shares, including 303,251 shares in a brokerage account and 148 shares held jointly with his spouse.

Insider Trade Summary 10b5-1

Net Seller: 19,313 shares

Net Sell 1 txn

Insider Eccher James

Role CHAIRMAN AND CEO

Sold 19,313 shs ($495K)

Type	Security	Shares	Price	Value
Sale	Old Second Bancorp, Inc. Common Stock F1, F2, F3	19,313	$25.6149	$495K

Holdings After Transaction: Old Second Bancorp, Inc. Common Stock — 303,399 shares (Direct)

Footnotes (3)

1. F1. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 1, 2026.
2. F2. The price reported is a weighted average price. The transactions were effected at prices ranging from $25.48 to $25.79.
3. F3. Included in this total are 303,251 shares held at a brokerage firm in the reporting person's name and 148 shares held jointly with spouse outright.

Key Figures

Shares sold: 19,313 shares Weighted average sale price: $25.6149 per share Post-transaction holdings: 303,399 shares +3 more

6 metrics

Shares sold 19,313 shares Common stock sale reported for August 12, 2026

Weighted average sale price $25.6149 per share Weighted average price for the reported sale transactions

Post-transaction holdings 303,399 shares Shares directly held by James Eccher after the sale

Brokerage account holdings 303,251 shares Portion of Eccher’s holdings at a brokerage firm

Jointly held shares with spouse 148 shares Shares held jointly with spouse outright

10b5-1 plan adoption date May 1, 2026 Date Eccher adopted the Rule 10b5-1 trading plan

Key Terms

Rule 10b5-1 trading plan, weighted average price, Form 4, common stock

4 terms

Rule 10b5-1 trading plan regulatory

"The sales ... were effected pursuant to a Rule 10b5-1 trading plan adopted"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average price financial

"The price reported is a weighted average price. The transactions were effected"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

Form 4 regulatory

"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

common stock financial

"Old Second Bancorp, Inc. Common Stock"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

FAQ

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

What insider transaction did OSBC Chairman and CEO James Eccher report?

James Eccher reported a sale of 19,313 Old Second Bancorp (OSBC) shares of common stock on August 12, 2026. The transaction was executed in the open market under a pre-established Rule 10b5-1 trading plan.

At what price did James Eccher sell OSBC shares in this Form 4 filing?

The reported sale used a weighted average price of $25.6149 per OSBC share. According to the filing, individual trade prices ranged between $25.48 and $25.79 during the August 12, 2026 transactions.

How many OSBC shares does James Eccher hold after the reported sale?

After the transaction, James Eccher directly holds 303,399 OSBC shares. This total includes 303,251 shares in a brokerage account in his name and 148 shares held jointly with his spouse.

Was the OSBC insider sale by James Eccher made under a Rule 10b5-1 plan?

Yes. The filing states the sales were effected under a Rule 10b5-1 trading plan that James Eccher adopted on May 1, 2026, indicating the trades were pre-arranged.

What role does James Eccher hold at Old Second Bancorp (OSBC)?

James Eccher is identified as both a director and the Chairman and CEO of Old Second Bancorp, Inc. His Form 4 reflects transactions in company common stock in his capacity as a reporting insider.

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

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Available on EDGAR 08/13/2026 - 10:48 AM Accepted by SEC EDGAR 08/13/2026 - 10:47 AM 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).

X

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)
08/12/2026

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	08/12/2026		S(1)		19,313	D	$25.6149(2)	303,399(3)	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. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 1, 2026.

2. The price reported is a weighted average price. The transactions were effected at prices ranging from $25.48 to $25.79.

3. Included in this total are 303,251 shares held at a brokerage firm in the reporting person's name and 148 shares held jointly with spouse outright.

	/s/ Shirley Cantrell, Attorney-in-Fact	08/13/2026
	** 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)