Moleculin Biotech CEO converts stock units to 57 shares

Moleculin Biotech, Inc. CEO and President Walter V. Klemp reported converting 57 restricted stock units into 57 common shares on November 4, 2026; the units convert one-for-one.

Available on EDGAR 11/06/2026 - 05:02 PM EST Accepted by SEC EDGAR 11/06/2026 - 05:02 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Moleculin Biotech, Inc. CEO and President Walter V. Klemp reported converting 57 restricted stock units into 57 common shares on November 4, 2026; the units convert one-for-one. The transaction also reports 14 common shares withheld for taxes upon vesting at $8.46 per share. Reported RSU holdings following the transaction were 127,415. No Rule 10b5-1 plan is reported.

Insider Trade Summary

57 shares exercised/converted

Exercise 3 txns

Insider KLEMP WALTER V

Role CEO and President

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units F1, F3	57	$0.00	$0.00
Exercise	Common Stock F1	57	--	--
Tax Withholding	Common Stock F2	14	$8.46	$118.44

Holdings After Transaction: Restricted Stock Units — 127,415 contracts (Direct); Common Stock — 36,203 shares (Direct)

Holdings Before and After: Restricted Stock Units, 127,472 to 127,415 contracts (Direct); Common Stock, 36,160 to 36,203 shares (Direct)

Footnotes (3)

1. F1. Restricted stock units convert into common stock on a one-for-one basis.
2. F2. Shares withheld for payment of taxes upon vesting of restricted stock unit awards.
3. F3. On November 4, 2024, the reporting person was granted 230 restricted stock units, vesting in four equal annual installments beginning on the first anniversary of the grant date.

Key Figures

Restricted stock units converted: 57 restricted stock units Common shares acquired: 57 common shares Shares withheld for taxes: 14 common shares +3 more

6 metrics

Restricted stock units converted 57 restricted stock units November 4, 2026

Common shares acquired 57 common shares From the one-for-one conversion of restricted stock units on November 4, 2026

Shares withheld for taxes 14 common shares Upon vesting on November 4, 2026

Reported transaction price $8.46 per share Shares withheld for taxes on November 4, 2026

RSU holdings following transaction 127,415 restricted stock units Following the November 4, 2026 transaction

Restricted stock units granted 230 restricted stock units Granted November 4, 2024

Key Terms

Restricted stock units, vesting, one-for-one basis

3 terms

Restricted stock units technical

"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 technical

"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.

one-for-one basis technical

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

FAQ

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

How many MBRX common shares did CEO Walter V. Klemp receive from RSUs?

Walter V. Klemp converted 57 restricted stock units into 57 common shares on November 4, 2026, on a one-for-one basis. No Rule 10b5-1 plan is reported.

How many shares were withheld for taxes from Walter V. Klemp’s MBRX RSUs?

Fourteen common shares were withheld for taxes upon vesting on November 4, 2026, at a reported price of $8.46 per share.

What were the vesting terms for Walter V. Klemp’s MBRX restricted stock units?

Klemp was granted 230 restricted stock units on November 4, 2024, vesting in four equal annual installments beginning on the first anniversary of the grant date.

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

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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^*

KLEMP WALTER V

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CEO and President

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	11/04/2026		M		57	A	(1)	36,217	D
Common Stock	11/04/2026		F		14(2)	D	$8.46	36,203	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
Restricted Stock Units	(1)	11/04/2026		M			57	(3)	(3)	Common Stock	57	$0	127,415	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 230 restricted stock units, vesting in four equal annual installments beginning on the first anniversary of the grant date.

	/s/ Jonathan P. Foster by Power of Attorney	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)