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[Form 4] Monopar Therapeutics Insider Trading Activity

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

Rhea-AI Filing Summary

Monopar Therapeutics Chief Executive Officer Chandler Robinson reported routine equity compensation activity. On March 31, 2026, 6,732 restricted stock units vested and were settled into an equal number of common shares at an exercise price of $0.00 per share.

Of these shares, 1,972 were withheld by the issuer at $54.79 per share to cover applicable tax withholding obligations. Following these transactions, Robinson held 90,478 shares of common stock directly and 62,815 shares indirectly through the Chandler D. Robinson Irrevocable Trust U/A dated May 20, 2020.

Positive

  • None.

Negative

  • None.
Insider Robinson Chandler
Role Chief Executive Officer
Type Security Shares Price Value
Exercise Restricted Stock Unit 6,732 $0.00 --
Exercise Common Stock 6,732 $0.00 --
Tax Withholding Common Stock 1,972 $54.79 $108K
holding Common Stock -- -- --
Holdings After Transaction: Restricted Stock Unit — 106,276 shares (Direct); Common Stock — 92,450 shares (Direct); Common Stock — 62,815 shares (Indirect, See Footnote)
Footnotes (1)
  1. Represents shares acquired on vesting and settlement of restricted stock units. Represents shares withheld by the issuer to pay for the applicable withholding tax due upon vesting of restricted stock units. Represents shares held by the Chandler D. Robinson Irrevocable Trust U/A dated May 20, 2020. On February 1, 2023, the reporting person was granted 33,803 restricted stock units, vesting 6/48ths (4,225 shares) on June 30, 2023, and 3/48ths (2,113 shares) every 3 months thereafter until the RSU is fully vested on December 31, 2026. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer. Disposed of restricted stock units were surrendered in exchange for issuance of common stock upon vesting and settlement. On March 4, 2025, the reporting person was granted 79,899 restricted stock units of which 6,002 shares vested immediately as of the grant date. The remaining 73,897 restricted stock units vest 6/48ths (9,237 shares) on June 30, 2025, and 3/48ths (4,619 shares) every 3 months thereafter until the RSU is fully vested on December 31, 2028. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer. Disposed of restricted stock units were surrendered in exchange for issuance of common stock upon vesting and settlement.
RSUs vested 6,732 units/shares Restricted stock units vesting and settlement on March 31, 2026
Shares withheld for taxes 1,972 shares Withheld at $54.79 per share to cover tax obligations
Tax withholding price $54.79 per share Value used for shares withheld for applicable taxes
Direct holdings after transaction 90,478 shares Common stock held directly by CEO following March 31, 2026 transactions
Indirect holdings via trust 62,815 shares Common stock held by Chandler D. Robinson Irrevocable Trust
2023 RSU grant size 33,803 units Restricted stock units granted on February 1, 2023
2025 RSU grant size 79,899 units Restricted stock units granted on March 4, 2025
restricted stock units financial
"On February 1, 2023, the reporting person was granted 33,803 restricted stock units, vesting 6/48ths..."
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.
withholding tax financial
"Represents shares withheld by the issuer to pay for the applicable withholding tax due upon vesting..."
Withholding tax is a government-required portion of a payment—such as dividends, interest, or salary—that the payer keeps back and sends directly to tax authorities before the recipient receives the money. For investors it reduces the cash they actually get and changes the after-tax return on an investment; rates and refund or credit rules vary by country and can materially affect comparisons between similar investments, like a cashier holding part of a bill to cover taxes.
irrevocable trust financial
"Represents shares held by the Chandler D. Robinson Irrevocable Trust U/A dated May 20, 2020."
vesting financial
"vesting 6/48ths (4,225 shares) on June 30, 2023, and 3/48ths (2,113 shares) every 3 months thereafter..."
Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.
contingent right financial
"Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer."
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*
Robinson Chandler

(Last)(First)(Middle)
1000 SKOKIE BLVD SUITE 350

(Street)
WILMETTE ILLINOIS 60091

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Monopar Therapeutics [ MNPR ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
XOfficer (give title below)Other (specify below)
Chief Executive Officer
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
Common Stock03/31/2026M6,732A(1)92,450D
Common Stock03/31/2026F1,972(2)D$54.7990,478D
Common Stock62,815ISee Footnote(3)
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
Restricted Stock Unit(1)03/31/2026M6,732 (4)(5) (4)(5)Common Stock6,732$0106,276D
Explanation of Responses:
1. Represents shares acquired on vesting and settlement of restricted stock units.
2. Represents shares withheld by the issuer to pay for the applicable withholding tax due upon vesting of restricted stock units.
3. Represents shares held by the Chandler D. Robinson Irrevocable Trust U/A dated May 20, 2020.
4. On February 1, 2023, the reporting person was granted 33,803 restricted stock units, vesting 6/48ths (4,225 shares) on June 30, 2023, and 3/48ths (2,113 shares) every 3 months thereafter until the RSU is fully vested on December 31, 2026. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer. Disposed of restricted stock units were surrendered in exchange for issuance of common stock upon vesting and settlement.
5. On March 4, 2025, the reporting person was granted 79,899 restricted stock units of which 6,002 shares vested immediately as of the grant date. The remaining 73,897 restricted stock units vest 6/48ths (9,237 shares) on June 30, 2025, and 3/48ths (4,619 shares) every 3 months thereafter until the RSU is fully vested on December 31, 2028. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer. Disposed of restricted stock units were surrendered in exchange for issuance of common stock upon vesting and settlement.
/s/ Quan Vu, 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)