Old Second officer plans $493K sale of 20K shares

The notice also reports a September 4, 2026 sale of 5,000 common shares with a value of $128,521.37.

Rhea-AI Filing Summary

OLD SECOND BANCORP INC. officer Gary S. Collins reported a proposed sale of 20,000 common shares, with an aggregate market value of $493,000. The notice lists 50,875,716 shares outstanding as of September 23, 2026. It also reports that Collins sold 5,000 common shares on September 4, 2026, with a reported value of $128,521.37 during the prior three months.

Key Figures

Proposed shares to be sold: 20,000 common shares Aggregate market value: $493,000 Shares outstanding: 50,875,716 shares +2 more

5 metrics

Proposed shares to be sold 20,000 common shares Proposed sale reported by Gary S. Collins

Aggregate market value $493,000 For the 20,000 common shares listed for sale

Shares outstanding 50,875,716 shares As of September 23, 2026

Prior three-month sale 5,000 common shares Sold September 4, 2026

Reported value of prior sale $128,521.37 For the 5,000 common shares sold September 4, 2026

Key Terms

Rule 144, person, Restricted Stock Units

3 terms

Rule 144 regulatory

"paragraph (a) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

person regulatory

"all other persons included in that definition"

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 proposed OSBC share sale did Gary S. Collins report?

OLD SECOND BANCORP INC. officer Gary S. Collins reported a proposed sale of 20,000 common shares, with an aggregate market value of $493,000.

How many OSBC shares had Gary S. Collins sold in the prior three months?

The notice lists 5,000 common shares sold on September 4, 2026, with a reported value of $128,521.37.

How many OLD SECOND BANCORP INC. shares were outstanding?

The notice lists 50,875,716 shares outstanding as of September 23, 2026.

Which restricted stock unit share amounts are listed in the OSBC notice?

The notice lists common-share amounts of 2,745 dated November 20, 2019; 2,620 dated March 13, 2020; 7,065 dated February 16, 2021; and 7,570 dated March 19, 2021, in rows identified as restricted stock units.

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

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Available on EDGAR 09/23/2026 - 12:24 PM Accepted by SEC EDGAR 09/23/2026 - 12:23 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001184766
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	OLD SECOND BANCORP INC
SEC File Number	000-10537
Address of Issuer	37 S RIVER ST AURORA ILLINOIS 60507
Phone	6308920202
Name of Person for Whose Account the Securities are To Be Sold	COLLINS GARY S
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	The Charles Schwab Corporation 3000 Schwab Way Westlake TX 76262	20000	493000.00	50875716	09/23/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	11/20/2019	Restricted Stock Units	Issuer			2745	11/20/2019	N/A
Common	03/13/2020	Restricted Stock Unit	Issuer			2620	03/13/2020	N/A
Common	02/16/2021	Restricted Stock Unit	Issuer			7065	02/16/2021	N/A
Common	03/19/2021	Restricted Stock Unit	Issuer			7570	03/19/2021	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Gary S. Collins 37 South River Street Aurora IL 60507	Common	09/04/2026	5000	128521.37

144: Remarks and Signature

Remarks
Date of Notice	09/23/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	Gary S. Collins
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)