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Old Second Bancorp (OSBC) EVP logs routine plan share allocations

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

Rhea-AI Filing Summary

OLD SECOND BANCORP INC EVP Donald Pilmer reported routine plan-related updates to his holdings of Old Second Bancorp, Inc. Common Stock. During the first quarter, 13 shares were allocated to his 401(k) plan and 1 share to an employees profit sharing plan. After these updates, he indirectly holds 4,023 shares via the 401(k) and 183 shares via the profit sharing plan, plus 1,450 shares in his spouse's IRA and 73,054 shares directly in a brokerage account. He also directly holds 39,498 Restricted Stock Units.

Positive

  • None.

Negative

  • None.
Insider Pilmer Donald
Role EVP
Type Security Shares Price Value
Other Old Second Bancorp, Inc. Common Stock 13 $0.00 --
Other Old Second Bancorp, Inc. Common Stock 1 $0.00 --
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 — 4,023 shares (Indirect, By 401-K Plan); Old Second Bancorp, Inc. Common Stock — 73,054 shares (Direct); Restricted Stock Units — 39,498 shares (Direct)
Footnotes (1)
  1. Of this total, 13 shares were allocated during the first quarter pursuant to the Old Second Bancorp, Inc. Salary and Savings Plan. Information was provided herein by the Plan Trustee as of 3-31-26. Of this total, 1 share was allocated during the first quarter pursuant to the Old Second Bancorp, Inc. Employees Profit Sharing Plan and Trust. Information herein was provided by the Plan Trustee as of 3-31-26. These shares are held in spouse's IRA for which Mr. Pilmer is listed as a beneficiary. These shares are held in the reporting person's name in a brokerage account.
401(k) plan allocation 13 shares Allocated during first quarter under Salary and Savings Plan
Profit sharing plan allocation 1 share Allocated during first quarter under Employees Profit Sharing Plan and Trust
401(k) holdings after allocation 4,023 shares Total Old Second Bancorp shares in 401(k) as of 3-31-26
Profit sharing holdings after allocation 183 shares Total Old Second Bancorp shares in profit sharing plan as of 3-31-26
Spouse IRA holdings 1,450 shares Old Second Bancorp shares held in spouse's IRA
Direct brokerage holdings 73,054 shares Old Second Bancorp shares held directly in brokerage account
Restricted Stock Units 39,498 units RSUs held directly by the reporting person
Restricted Stock Units financial
"Security title listed as Restricted Stock Units with 39,498 units held"
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.
Salary and Savings Plan financial
"13 shares were allocated during the first quarter pursuant to the Old Second Bancorp, Inc. Salary and Savings Plan"
Employees Profit Sharing Plan and Trust financial
"1 share was allocated during the first quarter pursuant to the Old Second Bancorp, Inc. Employees Profit Sharing Plan and Trust"
IRA financial
"These shares are held in spouse's IRA for which Mr. Pilmer is listed as a beneficiary"
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.
brokerage account financial
"These shares are held in the reporting person's name in a brokerage account"
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*
Pilmer Donald

(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)
03/31/2026
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 Stock03/31/2026JV13A$04,023(1)IBy 401-K Plan
Old Second Bancorp, Inc. Common Stock03/31/2026JV1A$0183(2)IBy Profit Sharing Plan
Old Second Bancorp, Inc. Common Stock1,450(3)ISpouse's IRA
Old Second Bancorp, Inc. Common Stock73,054(4)D
Restricted Stock Units39,498D
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, 13 shares were allocated during the first quarter pursuant to the Old Second Bancorp, Inc. Salary and Savings Plan. Information was provided herein by the Plan Trustee as of 3-31-26.
2. Of this total, 1 share was allocated during the first quarter pursuant to the Old Second Bancorp, Inc. Employees Profit Sharing Plan and Trust. Information herein was provided by the Plan Trustee as of 3-31-26.
3. These shares are held in spouse's IRA for which Mr. Pilmer is listed as a beneficiary.
4. These shares are held in the reporting person's name in a brokerage account.
/s/ Shirley Cantrell, Attorney-in-Fact04/02/2026
** 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 insider activity did OSBC EVP Donald Pilmer report on this Form 4?

EVP Donald Pilmer reported routine plan-related updates, not open-market trades. 13 shares were allocated to his 401(k) and 1 share to an employees profit sharing plan, reflecting ongoing participation in company benefit plans rather than discretionary buying or selling.

How many OSBC shares does Donald Pilmer now hold through retirement and benefit plans?

Following the reported updates, Donald Pilmer indirectly holds 4,023 Old Second Bancorp shares via a 401(k) plan and 183 shares via an employees profit sharing plan. These figures come from plan trustee information as of March 31, 2026, and show his accumulated retirement-related holdings.

What are Donald Pilmer’s direct holdings of Old Second Bancorp common stock?

Donald Pilmer directly holds 73,054 shares of Old Second Bancorp common stock in a brokerage account. This direct position is separate from his retirement and profit sharing plan interests and indicates his personal ownership stake outside of tax-advantaged plans and spousal accounts.

How many Restricted Stock Units does the OSBC EVP hold after this filing?

After the reported updates, the EVP holds 39,498 Restricted Stock Units. RSUs are a form of equity-based compensation that may convert into common shares over time, subject to vesting conditions and other terms defined under Old Second Bancorp’s compensation programs.

What indirect OSBC holdings are reported through the EVP’s spouse’s IRA?

The filing notes 1,450 Old Second Bancorp shares held in the spouse’s IRA, where Donald Pilmer is listed as a beneficiary. These are classified as indirect holdings and are distinct from his own retirement plans and his directly held brokerage account shares.

Does this OSBC Form 4 show any insider buying or selling in the open market?

The Form 4 does not show open-market purchases or sales. It reports small plan allocations coded as “J” transactions, described as other acquisitions or dispositions, along with updated totals for various direct and indirect holdings, indicating routine administrative adjustments rather than trading activity.
Old Second Bancorp Inc Ill

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