STOCK TITAN

Old Second Bancorp (NASDAQ: OSBC) vice chair sells 15,000 shares

Filing Impact
(Moderate)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

OLD SECOND BANCORP INC vice chairman Gary S. Collins reported open-market sales of company stock. On May 8, 2026, he sold 15,000 shares of Old Second Bancorp common stock in two transactions at $21.225 and $21.240 per share.

After these sales, Collins held 30,136 common shares directly, plus 73,256.085 shares indirectly through an IRA. He also reported 37,312 Restricted Stock Units and 7,058 common shares held via a 401-K plan, indicating he retains a substantial stake in the company.

Positive

  • None.

Negative

  • None.
Insider COLLINS GARY S
Role VICE CHAIRMAN
Sold 15,000 shs ($319K)
Type Security Shares Price Value
Sale Old Second Bancorp, Inc. Common Stock 10,000 $21.24 $212K
Sale Old Second Bancorp, Inc. Common Stock 5,000 $21.225 $106K
holding Old Second Bancorp, Inc. Common Stock -- -- --
holding Restricted Stock Units -- -- --
Holdings After Transaction: Old Second Bancorp, Inc. Common Stock — 30,136 shares (Direct, null); Old Second Bancorp, Inc. Common Stock — 73,256.085 shares (Indirect, IRA); Restricted Stock Units — 37,312 shares (Direct, null)
Footnotes (1)
Shares sold (trade 1) 5,000 shares at $21.225 Open-market sale on May 8, 2026
Shares sold (trade 2) 10,000 shares at $21.240 Open-market sale on May 8, 2026
Total shares sold 15,000 shares Net shares sold in reported transactions
Direct common shares after 30,136 shares Direct holdings following transactions
IRA common shares after 73,256.085 shares Indirect IRA holdings following transactions
Restricted Stock Units 37,312 units RSU holdings as of May 8, 2026
401-K common shares 7,058 shares Indirect holdings via 401-K
Restricted Stock Units financial
"security_title: "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.
open-market sale financial
"transaction_action: "open-market sale""
An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.
IRA financial
"nature_of_ownership: "IRA""
An individual retirement account (IRA) is a savings account designed to help people put aside money for their retirement, often with tax advantages that encourage long-term savings. It matters to investors because it can grow over time, providing financial security later in life, and offers benefits that can reduce current taxes or allow investments to compound more effectively.
401-K financial
"nature_of_ownership: "By 401-K""
SEC Form 4
FORM 4UNITED 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*
COLLINS GARY S

(Last)(First)(Middle)
37 S. RIVER ST.

(Street)
AURORA ILLINOIS 60302

(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)
XDirector10% Owner
XOfficer (give title below)Other (specify below)
VICE CHAIRMAN
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/08/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Old Second Bancorp, Inc. Common Stock05/08/2026S10,000D$21.2430,136D
Old Second Bancorp, Inc. Common Stock05/08/2026S5,000D$21.22573,256.085IIRA
Old Second Bancorp, Inc. Common Stock7,058IBy 401-K
Restricted Stock Units37,312D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
/s/ Shirley Cantrell, Attorney-in-Fact05/11/2026
** Signature of Reporting PersonDate
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)