Form 4 for MBRX Moleculin Biotech, Inc.

Accepted 2026-08-05 16:16:13 ET · period of report 2026-08-03 · accession 0001437749-26-025928 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
D	2026-08-05 16:16	2026-08-03	MBRX	KLEMP WALTER V	CEO, Pres, Dir	P - Purchase	—	+533.3K	564.3K	+1,720%	—
D	2026-08-05 16:16	2026-08-03	MBRX	KLEMP WALTER V	CEO, Pres, Dir	A - Grant	—	+1.60M	1.93M	+490%	—

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Common Stock	2026-08-03	P	A	533,333	—	564,340	D	—	—	(F1) On August 3, 2026, the reporting person acquired 533,333 shares of common stock and Series I warrants to purchase 1,599,999 shares of common stock at a combined purchase price of $0.75 per one share of common stock and three accompanying warrants in a public offering.
2	Derivative	Series I Warrants	2026-08-03	A	A	1,599,999	—	1,926,335	D	— · 2026-08-03 to 2031-08-03	1,599,999 Common Stock	(F1) On August 3, 2026, the reporting person acquired 533,333 shares of common stock and Series I warrants to purchase 1,599,999 shares of common stock at a combined purchase price of $0.75 per one share of common stock and three accompanying warrants in a public offering. (F1) On August 3, 2026, the reporting person acquired 533,333 shares of common stock and Series I warrants to purchase 1,599,999 shares of common stock at a combined purchase price of $0.75 per one share of common stock and three accompanying warrants in a public offering. (F1) On August 3, 2026, the reporting person acquired 533,333 shares of common stock and Series I warrants to purchase 1,599,999 shares of common stock at a combined purchase price of $0.75 per one share of common stock and three accompanying warrants in a public offering.