Moleculin Biotech CFO acquires 41 shares from stock grant

Q: How many RSUs did MBRX's CFO convert, and how many shares were withheld?

Jonathan P. Foster converted 41 restricted stock units into 41 common shares on November 4, 2026. 10 shares were withheld for payment of taxes upon vesting at $8.46 per share. The restricted-stock-unit entry reports 70,854 shares following the transaction.

Q: When were Jonathan P. Foster's MBRX restricted stock units granted, and how do they vest?

Foster was granted 165 restricted stock units on November 4, 2024. They vest in four equal annual installments beginning on the first anniversary of the grant date.

The original award covered 165 restricted stock units, vesting in four equal annual installments beginning on the first anniversary of its November 4, 2024 grant.

Available on EDGAR 11/06/2026 - 05:03 PM EST Accepted by SEC EDGAR 11/06/2026 - 05:03 PM EST

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)How Sentiment works

Sentiment and the balance of points

Rhea-AI Sentiment reads the wording of the document, how positive or negative its language is on a 1 to 5 scale. The balance of points shown with the takes weighs what the document actually discloses, so the two can disagree, for example when a trial that missed its main goal is described in upbeat language.

How Sentiment works How the balance works

Form Type

Rhea-AI Filing Summary

Moleculin Biotech, Inc. CFO Jonathan P. Foster converted 41 restricted stock units into 41 common shares on November 4, 2026. Upon vesting, 10 shares were withheld for payment of taxes at $8.46 per share. The restricted-stock-unit entry reports 70,854 shares following the transaction. The original grant was 165 restricted stock units, vesting in four equal annual installments beginning on the first anniversary of the grant date.

Insider Trade Summary

41 shares exercised/converted

Exercise 3 txns

Insider Foster Jonathan P.

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units ^{F1, F3}	41	$0.00	$0.00
Exercise	Common Stock ^F1	41	--	--
Tax Withholding	Common Stock ^F2	10	$8.46	$84.60

Holdings After Transaction: Restricted Stock Units — 70,854 contracts (Direct); Common Stock — 20,291 shares (Direct)

Holdings Before and After: Restricted Stock Units, 70,895 to 70,854 contracts (Direct); Common Stock, 20,260 to 20,291 shares (Direct)

Footnotes (3)

F1. Restricted stock units convert into common stock on a one-for-one basis.
F2. Shares withheld for payment of taxes upon vesting of restricted stock unit awards.
F3. On November 4, 2024, the reporting person was granted 165 restricted stock units, vesting in four equal annual installments beginning on the first anniversary of the grant date.

Key Figures

Restricted stock units converted: 41 restricted stock units Common shares acquired: 41 shares Shares withheld for taxes: 10 shares +4 more

7 metrics

Restricted stock units converted 41 restricted stock units November 4, 2026

Common shares acquired 41 shares Upon conversion of restricted stock units on November 4, 2026

Shares withheld for taxes 10 shares Upon vesting on November 4, 2026

Withholding price $8.46 per share Shares withheld for payment of taxes upon vesting

Restricted-stock-unit entry following transaction 70,854 shares Following the November 4, 2026 transaction

Restricted stock units granted 165 restricted stock units Granted November 4, 2024

Vesting installments 4 equal annual installments Beginning on the first anniversary of the grant date

Key Terms

Restricted stock units, vesting, annual installments

3 terms

Restricted stock units financial

"Restricted stock units convert into common stock on a one-for-one basis."

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.

vesting financial

"Shares withheld for payment of taxes upon vesting of restricted stock unit awards."

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.

annual installments financial

"vesting in four equal annual installments beginning on the first anniversary of the grant date."

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many RSUs did MBRX's CFO convert, and how many shares were withheld?

Jonathan P. Foster converted 41 restricted stock units into 41 common shares on November 4, 2026. 10 shares were withheld for payment of taxes upon vesting at $8.46 per share. The restricted-stock-unit entry reports 70,854 shares following the transaction.

When were Jonathan P. Foster's MBRX restricted stock units granted, and how do they vest?

Foster was granted 165 restricted stock units on November 4, 2024. They vest in four equal annual installments beginning on the first anniversary of the grant date.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google

SEC Form 4

FORM 4

UNITED 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^*

Foster Jonathan P.

(Last)

(First)

(Middle)

C/O MOLECULIN BIOTECH, INC.

5300 MEMORIAL DR., SUITE 950

(Street)

HOUSTON

TEXAS

77007

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Moleculin Biotech, Inc. [ MBRX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
11/04/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	11/04/2026		M		41	A	⁽¹⁾	20,301	D
Common Stock	11/04/2026		F		10⁽²⁾	D	$8.46	20,291	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units	⁽¹⁾	11/04/2026		M			41	⁽³⁾	⁽³⁾	Common Stock	41	$0	70,854	D

Explanation of Responses:

1. Restricted stock units convert into common stock on a one-for-one basis.

2. Shares withheld for payment of taxes upon vesting of restricted stock unit awards.

3. On November 4, 2024, the reporting person was granted 165 restricted stock units, vesting in four equal annual installments beginning on the first anniversary of the grant date.

	/s/ Jonathan P. Foster	11/06/2026
	** 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)

Source: View Original Filing on SEC EDGAR