Walter V. Klemp - Jul 2, 2021 Form 4 Insider Report for Moleculin Biotech, Inc. (MBRX)

Role: CEO and President, Director
Signature: /s/ Walter V. Klemp
Stock symbol: MBRX
Transactions as of: Jul 2, 2021
Transactions value $: -$12,759
Form type: 4
Date filed: 7/6/2021, 07:30 AM
Previous filing: Jun 21, 2021
Next filing: Jul 12, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MBRX	Common Stock	Options Exercise		+14.7K	+8.59%		186K	Jul 2, 2021	Direct	F1
transaction	MBRX	Common Stock	Tax liability	-$12.8K	-3.58K	-1.93%	$3.56	182K	Jul 2, 2021	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	-14.7K	-2.01%	$0.00	718K	Jul 2, 2021	Common Stock	14.7K		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 July 2, 2020, the reporting person was granted 58,869 restricted stock units, vesting in four equal annual installments beginning on the first anniversary of the grant date.