Donald H. Picker - 04 Nov 2025 Form 4 Insider Report for Moleculin Biotech, Inc. (MBRX)

Role
Chief Science Officer
Signature
/s/ Jonathan P. Foster by Power of Attorney
Issuer symbol
MBRX
Transactions as of
04 Nov 2025
Net transactions value
-$1,059
Form type
4
Filing time
06 Nov 2025, 20:25:26 UTC
Previous filing
23 Jun 2025
Next filing
14 Nov 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
PICKER DONALD H Chief Science Officer C/O MOLECULIN BIOTECH, INC., 5300 MEMORIAL DR., SUITE 950, HOUSTON /s/ Jonathan P. Foster by Power of Attorney 06 Nov 2025 0001266800

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MBRX Common Stock Options Exercise +8,750 +86% 18,902 04 Nov 2025 Direct F1
transaction MBRX Common Stock Tax liability $1,059 -2,131 -11% $0.4970 16,771 04 Nov 2025 Direct F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction MBRX Restricted Stock Units Options Exercise $0 -8,750 -8.4% $0.000000 95,508 04 Nov 2025 Common Stock 8,750 Direct F1, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
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 35,000 restricted stock units, vesting in four equal annual installments beginning on the first anniversary of the grant date