Old Second Bancorp Insider Trading Update

TL;DR

Gary Collins changed his Old Second Bancorp holdings. Filing date 3/23/26.

AI Summary

On March 23, 2026, Gary S. Collins reported a change in beneficial ownership of securities for OLD SECOND BANCORP INC. The filing, dated March 20, 2026, details these changes.

Why It Matters

This filing indicates a change in ownership by an insider, which can signal their confidence or concerns about the company's future performance.

Risk Assessment

Risk Level: low — Form 4 filings typically report routine changes in insider holdings and do not inherently indicate significant risk.

Key Players & Entities

• Gary S. Collins (person) — Reporting person
• OLD SECOND BANCORP INC (company) — Issuer
• 0000357173 (company) — Issuer CIK
• 0001184766 (person) — Reporting person CIK

FAQ

Key Financial Figures

• $19.37 — ple transactions at prices ranging from $19.37 to $19.40, inclusive. The Reporting Per
• $19 — ctions at prices ranging from $19.37 to $19.40, inclusive. The Reporting Person und

Filing Documents

• form4-03232026_060354.html (4)
• form4-03232026_060354.xml (4) — 6KB
• 0001184766-26-000008.txt ( ) — 7KB

From the Filing

SEC FORM 4 SEC Form 4 FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 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) X Director 10% Owner X Officer (give title below) Other (specify below) VICE CHAIRMAN 2a. Foreign Trading Symbol 3. Date of Earliest Transaction (Month/Day/Year) 03/20/2026 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 03/20/2026 S 22,154 D $ 19.3841 (1) 40,136 D Old Second Bancorp, Inc. Common Stock 78,256.085 (2) I IRA Old Second Bancorp, Inc. Common Stock 6,805 I By 401-K Restricted Stock Units 37,312 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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.37 to $19.40, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. 2. Included in this total are 41,000 shares in a ROTH IRA and 37,256.085 in a traditional IRA. /s/ Shirley Cantrell, Attorney-in-Fact 03/23/2026 ** 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)

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