Walter V. Klemp - Jul 11, 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 11, 2021
Transactions value $: -$11,445
Form type: 4
Date filed: 7/12/2021, 05:57 PM
Previous filing: Jul 6, 2021
Next filing: Dec 17, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MBRX	Common Stock	Options Exercise		+13.2K	+7.24%		196K	Jul 11, 2021	Direct	F1
transaction	MBRX	Common Stock	Tax liability	-$11.4K	-3.22K	-1.64%	$3.56	192K	Jul 11, 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	-13.2K	-1.85%	$0.00	701K	Jul 11, 2021	Common Stock	13.2K		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 11, 2019, the reporting person was granted 52,818 restricted stock units, vesting in four equal annual installments beginning on the first anniversary of the grant date.