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Old Second Bancorp (OSBC) EVP updates stock, RSU and 401(k) holdings

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

OLD SECOND BANCORP INC executive Richard A. Gartelmann Jr., an EVP, reported updated holdings and a small plan-related allocation of company stock. A Form 4 entry shows 42 shares of Old Second Bancorp, Inc. common stock were allocated during the second quarter under the company’s Employee Salary and Savings Plan, based on information from the plan trustee as of June 30, 2026.

Following these updates, he directly holds 21,294 Restricted Stock Units and 29,551 shares of common stock, and indirectly holds 12,648 shares of common stock through a 401(k) plan. The filing reflects compensation and retirement-plan activity rather than open-market trading.

Positive

  • None.

Negative

  • None.
Insider Gartelmann Richard A JR
Role EVP
Type Security Shares Price Value
Other Old Second Bancorp, Inc. Common Stock 42 $0.00 --
holding Old Second Bancorp, Inc. Common Stock -- -- --
holding Restricted Stock Units -- -- --
Holdings After Transaction: Old Second Bancorp, Inc. Common Stock — 12,648 shares (Indirect, By 401-K); Old Second Bancorp, Inc. Common Stock — 29,551 shares (Direct, null); Restricted Stock Units — 21,294 shares (Direct, null)
Footnotes (1)
  1. [object Object]
Plan allocation 42 shares Allocated in Q2 under Employee Salary and Savings Plan
Direct RSU holdings 21,294 RSUs Restricted Stock Units held directly as of June 30, 2026
Direct common stock holdings 29,551 shares Old Second Bancorp, Inc. common stock held directly as of June 30, 2026
Indirect 401(k) holdings 12,648 shares Old Second Bancorp, Inc. common stock held indirectly by 401-K
Restructuring transaction 42 shares J-code other acquisition or disposition linked to 401-K plan
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.
Employee Salary and Savings Plan financial
"allocated during the second quarter pursuant to the Old Second Bancorp, Inc. Employee Salary and Savings Plan"
Form 4 regulatory
"INSIDER FILING DATA (Form 4):"
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.
indirect financial
""ownership_type": "indirect""
401-K financial
""nature_of_ownership": "By 401-K""
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Learn about SEC filing dates
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*
Gartelmann Richard A JR

(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)
Director10% Owner
XOfficer (give title below)Other (specify below)
EVP
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/30/2026
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 Stock06/30/2026J42(1)A$012,648IBy 401-K
Old Second Bancorp, Inc. Common Stock29,551D
Restricted Stock Units21,294D
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:
1. Of this total, 42 shares were allocated during the second quarter pursuant to the Old Second Bancorp, Inc. Employee Salary and Savings Plan. Information herein was provided by the Plan Trustee as of 6-30-26.
/s/ Shirley Cantrell, Attorney-in-Fact07/02/2026
** 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)

FAQ

What did OSBC EVP Richard Gartelmann report in this Form 4?

He reported updated holdings and a small allocation of Old Second Bancorp, Inc. common stock. 42 shares were allocated to his account under the company’s Employee Salary and Savings Plan during the second quarter, and his direct and indirect holdings were updated accordingly.

How many Old Second Bancorp (OSBC) RSUs does Richard Gartelmann hold?

After the reported changes, he holds 21,294 Restricted Stock Units directly. Restricted Stock Units are share-based compensation that typically convert into common stock over time, tying a portion of executive pay to the company’s long-term performance and share value.

What are Richard Gartelmann’s direct OSBC common stock holdings after this filing?

The Form 4 shows he directly owns 29,551 shares of Old Second Bancorp, Inc. common stock as of June 30, 2026. These shares are separate from his Restricted Stock Units and represent his direct equity stake in the company’s stock.

What does the 42-share transaction in Richard Gartelmann’s OSBC 401(k) represent?

The 42 shares were allocated in the second quarter under Old Second Bancorp’s Employee Salary and Savings Plan. According to the trustee, this reflects plan activity in his 401(k), not an open-market purchase or sale directed by him personally.

How many OSBC shares does Richard Gartelmann hold indirectly through his 401(k)?

Following the reported plan allocation, he indirectly holds 12,648 shares of Old Second Bancorp, Inc. common stock through a 401(k) arrangement. These shares are recorded as indirect ownership, labeled “By 401-K” in the Form 4 filing.