MBRX Form 4: 150,000 stock options, vest 11/12/2026, expire 2035

Rhea-AI Filing Summary

Moleculin Biotech (MBRX) reported a director’s stock option grant on a Form 4. The filing shows 150,000 stock options with an exercise price of $0.49, granted on 11/12/2025. These options vest on 11/12/2026, subject to continued Board service, and expire on 11/12/2035.

Following this transaction, the filing lists 164,001 derivative securities beneficially owned, held in direct ownership. The options were issued in connection with the reporting person’s Board of Director service.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Yan Joy

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Stock Options (right to buy)	150,000	$0.00	--

Holdings After Transaction: Stock Options (right to buy) — 164,001 shares (Direct)

Footnotes (1)

1. The options set forth in this table vest on November 12, 2026, subject to the grantee's continued service on the Company's Board of Directors on each vesting date. The options were issued in connection with the reporting person's Board of Director service to the Company.

Form 4 Insider Transactions: What Each Field Means →

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^*

Yan Joy

(Last) (First) (Middle)

C/O MOLECULIN BIOTECH, INC.

5300 MEMORIAL DR., SUITE 950

(Street)

HOUSTON TX 77007

(City) (State) (Zip)

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
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
11/12/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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

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
Stock Options (right to buy)	$0.49	11/12/2025		A		150,000		11/12/2026(1)	11/12/2035	Common Stock	150,000	(2)	164,001	D

Explanation of Responses:

1. The options set forth in this table vest on November 12, 2026, subject to the grantee's continued service on the Company's Board of Directors on each vesting date.

2. The options were issued in connection with the reporting person's Board of Director service to the Company.

	/s/ Jonathan Foster by Power of Attorney	11/14/2025
	** 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.

FAQ

What did Moleculin Biotech (MBRX) disclose in this Form 4?

A director received 150,000 stock options at an exercise price of $0.49 on 11/12/2025.

When do the MBRX options vest and expire?

They vest on 11/12/2026, subject to continued Board service, and expire on 11/12/2035.

What is the exercise price of the options reported by MBRX?

The exercise price is $0.49 per share.

How many derivative securities are beneficially owned after the transaction?

The filing reports 164,001 derivative securities beneficially owned after the transaction.

What is the ownership form for the reported MBRX options?

The ownership form is listed as Direct.

Why were the options issued according to the filing?

They were issued in connection with the reporting person’s Board of Director service.