Old Second CEO sells 55,687 shares under plan

Old Second Bancorp, Inc. Chairman and CEO James Eccher reported selling 55,687 shares of common stock on August 11, 2026 at a weighted average price of $25.4595 per share, with trades ranging from $25.30 to $25.6050.

Rhea-AI Filing Summary

Old Second Bancorp, Inc. Chairman and CEO James Eccher reported selling 55,687 shares of common stock on August 11, 2026 at a weighted average price of $25.4595 per share, with trades ranging from $25.30 to $25.6050. The sales were effected under a Rule 10b5-1 trading plan adopted on May 1, 2026. Following the sale, he reported 322,712 directly held shares, additional indirect holdings of 33,498 shares via a 401(k) and 6,378 via a profit-sharing plan, and 188,252 Restricted Stock Units.

Insider Trade Summary 10b5-1

Net Seller: 55,687 shares

Net Sell 4 txns

Insider Eccher James

Role CHAIRMAN AND CEO

Sold 55,687 shs ($1.42M)

Type	Security	Shares	Price	Value
Sale	Old Second Bancorp, Inc. Common Stock F1, F2	55,687	$25.4595	$1.42M
holding	Old Second Bancorp, Inc. Common Stock	--	--	--
holding	Old Second Bancorp, Inc. Common Stock	--	--	--
holding	Restricted Stock Units	--	--	--

Holdings After Transaction: Old Second Bancorp, Inc. Common Stock — 322,712 shares (Direct); Old Second Bancorp, Inc. Common Stock — 33,498 shares (Indirect, By 401-K); Old Second Bancorp, Inc. Common Stock — 6,378 shares (Indirect, By Profit Sharing); Restricted Stock Units — 188,252 shares (Direct)

Footnotes (2)

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 $25.30 to $25.6050.

Key Figures

Shares sold: 55,687 shares Weighted average sale price: $25.4595 per share Sale price range: $25.30 to $25.6050 +5 more

8 metrics

Shares sold 55,687 shares Sale of Old Second Bancorp, Inc. common stock on August 11, 2026

Weighted average sale price $25.4595 per share Reported sale price for 55,687 shares, with trades in a specified range

Sale price range $25.30 to $25.6050 Price range at which the reported sales were effected

Direct holdings after sale 322,712 shares Directly owned Old Second Bancorp, Inc. common stock following the transaction

Indirect 401(k) holdings 33,498 shares Shares held indirectly by 401-K after the reported transaction date

Indirect profit-sharing holdings 6,378 shares Shares held indirectly by Profit Sharing after the reported transaction date

Restricted Stock Units held 188,252 units Restricted Stock Units reported as directly held after the transaction

Rule 10b5-1 plan adoption date May 1, 2026 Adoption date of the trading plan under which the sales were effected

Key Terms

Rule 10b5-1 trading plan, weighted average price, Restricted Stock Units

3 terms

Rule 10b5-1 trading plan regulatory

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

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."

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.

Restricted Stock Units financial

"Security title is reported as 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 did OSBC Chairman and CEO James Eccher report in this Form 4?

James Eccher reported a sale of 55,687 Old Second Bancorp (OSBC) shares on August 11, 2026 at a weighted average price of $25.4595 per share, executed under a Rule 10b5-1 trading plan.

At what prices were James Eccher’s OSBC shares sold on August 11, 2026?

The reported 55,687 OSBC shares were sold at a weighted average price of $25.4595, with individual trades executed in a price range from $25.30 to $25.6050, according to the Form 4 footnote disclosure.

Was James Eccher’s OSBC stock sale under a Rule 10b5-1 trading plan?

Yes. The Form 4 states the sales were made pursuant to a Rule 10b5-1 trading plan adopted by James Eccher on May 1, 2026, indicating the transactions were pre-arranged under that plan.

How many OSBC shares does James Eccher hold directly after this transaction?

After the August 11, 2026 sale, James Eccher reported 322,712 shares of Old Second Bancorp (OSBC) common stock held in direct ownership, in addition to various indirect holdings and Restricted Stock Units.

What indirect OSBC holdings does James Eccher report after the sale?

Post-transaction, James Eccher reports 33,498 OSBC shares held indirectly via a 401(k) plan and 6,378 shares held indirectly via a profit-sharing plan, along with separate holdings of 188,252 Restricted Stock Units.

How many Restricted Stock Units related to OSBC does James Eccher hold?

James Eccher reports 188,252 Restricted Stock Units related to Old Second Bancorp (OSBC) after the reported sale. These RSUs represent rights to receive shares in the future, subject to applicable vesting and plan terms.

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

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Available on EDGAR 08/12/2026 - 04:52 PM Accepted by SEC EDGAR 08/12/2026 - 04:52 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).

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)
08/11/2026

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	08/11/2026		S(1)		55,687	D	$25.4595(2)	322,712	D
Old Second Bancorp, Inc. Common Stock								33,498	I	By 401-K
Old Second Bancorp, Inc. Common Stock								6,378	I	By Profit Sharing
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. 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 $25.30 to $25.6050.

	/s/ Shirley Cantrell, Attorney-in-Fact	08/12/2026
	** 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)