Moleculin Biotech science chief gets 250,000 options

Half of the options vest on the grant date, with the remaining half vesting in 18 equal installments over 18 months.

Rhea-AI Filing Summary

At Moleculin Biotech, Inc. (MBRX), Chief Science Officer Donald H. Picker received an employment-related grant of 250,000 options to buy common stock on October 15, 2026. The options have an exercise price of $0.3701 per share, and his direct option holdings after the grant were 789,595. Half of the grant vests on the grant date; the other half vests in 18 equal installments over 18 months. The options expire October 15, 2036.

Insider Trade Summary

Grant/Award: 250,000 shares

Grant/Award 1 txn

Insider PICKER DONALD H

Role Chief Science Officer

Type	Security	Shares	Price	Value
Grant/Award	Stock Options (right to buy) F2, F1	250,000	--	--

Holdings After Transaction: Stock Options (right to buy) — 789,595 contracts (Direct)

Footnotes (2)

1. F1. The stock option set forth in this table vests as follows: (i) 50% on grant; and (ii) 50% in 18 equal installments over 18 months.
2. F2. Issued in connection with the reporting person's employment with the Company.

Key Figures

Stock options granted: 250,000 options Exercise price: $0.3701 per share Direct option holdings after grant: 789,595 options +3 more

6 metrics

Stock options granted 250,000 options October 15, 2026

Exercise price $0.3701 per share Options to buy common stock

Direct option holdings after grant 789,595 options After the October 15, 2026 grant

Vesting on grant date 50% Grant vesting schedule

Remaining vesting 50% in 18 equal installments over 18 months Grant vesting schedule

Option expiration October 15, 2036 Grant expiration date

Key Terms

Stock Options (right to buy), exercise price, vests

3 terms

Stock Options (right to buy) financial

"The stock option set forth in this table"

exercise price financial

"options to buy common stock at an exercise price of $0.3701"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

vests financial

"50% on grant; and 50% in 18 equal installments over 18 months"

FAQ

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

How many options did MBRX's chief science officer receive?

Chief Science Officer Donald H. Picker received 250,000 options to buy common stock on October 15, 2026. The options have an exercise price of $0.3701 per share, and his direct option holdings after the grant were 789,595.

How do Donald H. Picker's MBRX options vest?

50% vests on the grant date, and the other 50% vests in 18 equal installments over 18 months.

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

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Available on EDGAR 10/16/2026 - 09:01 PM EDT Accepted by SEC EDGAR 10/16/2026 - 09:01 PM EDT Learn about SEC filing dates

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^*

PICKER DONALD H

(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 Science Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/15/2026

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

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)	$0.3701	10/15/2026		A		250,000		(1)	10/15/2036	Common Stock	250,000	(2)	789,595	D

Explanation of Responses:

1. The stock option set forth in this table vests as follows: (i) 50% on grant; and (ii) 50% in 18 equal installments over 18 months.

2. Issued in connection with the reporting person's employment with the Company.

	/s/ Jonathan P. Foster by Power of Attorney	10/16/2026
	** 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)