MBRX

Moleculin Biotech, Inc.Cluster buy · 3 insiders

Insider trading activity for Moleculin Biotech, Inc., straight from SEC Form 4 filings. Net figures below count open-market buys and sales only — grants, option exercises and tax withholding are excluded because they are compensation, not decisions to trade.

Past 3 months

net buying

Bought(3 · 3 insiders): $0
Sold(0 · 0 insiders): $0

Past 6 months

net buying

Bought(3 · 3 insiders): $0
Sold(0 · 0 insiders): $0

Past 12 months

net buying

Bought(3 · 3 insiders): $0
Sold(0 · 0 insiders): $0

Active cluster buy

3 insiders bought on the open market within 30 days.

All clusters →

MBRX

Moleculin Biotech, Inc.

—

total bought

3 insiders3 buys999,999 shares

All 3 insiders bought on Aug 3 — a single shared event.

Klemp Walter VCEO and President—
Foster Jonathan P.Chief Financial…—
Picker Donald HChief Science…—

Transaction history

The 72 most recent Form 4 transactions.

Open in screener →

Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Insider	Role	Type	Shares	Price	Value	Δ Own	Filing
Aug 3	Picker Donald H	Chief Science Officer	PDBUY◆	519,999	—	—	—	Open the original filing on SEC.gov
Aug 3	Picker Donald H	Chief Science Officer	PBUY★	173,333	—	—	+23,019%	Open the original filing on SEC.gov
Aug 3	Klemp Walter V	CEO and President	AGRANT◆	1.6M	—	—	—	Open the original filing on SEC.gov
Aug 3	Klemp Walter V	CEO and President	PBUY	533,333	—	—	+1,720%	Open the original filing on SEC.gov
Aug 3	Foster Jonathan P.	Chief Financial Officer	PDBUY◆	879,999	—	—	—	Open the original filing on SEC.gov
Aug 3	Foster Jonathan P.	Chief Financial Officer	PBUY	293,333	—	—	+2,377%	Open the original filing on SEC.gov
Jun 22	Picker Donald H	Chief Science Officer	MEXER◆	71	—	—	—	Open the original filing on SEC.gov
Jun 22	Picker Donald H	Chief Science Officer	FTAX	21	$3.12	$66	-2.7%	Open the original filing on SEC.gov
Jun 22	Picker Donald H	Chief Science Officer	MEXER	71	—	—	+10.1%	Open the original filing on SEC.gov
Jun 22	Klemp Walter V	CEO and President	MEXER◆	360	—	—	—	Open the original filing on SEC.gov
Jun 22	Klemp Walter V	CEO and President	FTAX	88	$3.12	$275	-0.3%	Open the original filing on SEC.gov
Jun 22	Klemp Walter V	CEO and President	MEXER	360	—	—	+1.2%	Open the original filing on SEC.gov
Jun 22	Foster Jonathan P.	Chief Financial Officer	MEXER◆	174	—	—	—	Open the original filing on SEC.gov
Jun 22	Foster Jonathan P.	Chief Financial Officer	FTAX	41	$3.12	$128	-0.3%	Open the original filing on SEC.gov
Jun 22	Foster Jonathan P.	Chief Financial Officer	MEXER	174	—	—	+1.4%	Open the original filing on SEC.gov
Jun 20	Picker Donald H	Chief Science Officer	MEXER◆	44	—	—	—	Open the original filing on SEC.gov
Jun 20	Picker Donald H	Chief Science Officer	FTAX	13	$2.88	$37	-1.8%	Open the original filing on SEC.gov
Jun 20	Picker Donald H	Chief Science Officer	MEXER	44	—	—	+6.6%	Open the original filing on SEC.gov
Jun 20	Klemp Walter V	CEO and President	MEXER◆	150	—	—	—	Open the original filing on SEC.gov
Jun 20	Klemp Walter V	CEO and President	FTAX	37	$2.88	$107	-0.1%	Open the original filing on SEC.gov
Jun 20	Klemp Walter V	CEO and President	MEXER	150	—	—	+0.5%	Open the original filing on SEC.gov
Jun 20	Foster Jonathan P.	Chief Financial Officer	MEXER◆	109	—	—	—	Open the original filing on SEC.gov
Jun 20	Foster Jonathan P.	Chief Financial Officer	FTAX	31	$2.88	$89	-0.3%	Open the original filing on SEC.gov
Jun 20	Foster Jonathan P.	Chief Financial Officer	MEXER	109	—	—	+0.9%	Open the original filing on SEC.gov
Nov 12, 2025	Picker Donald H	CSO	AGRANT◆	200,000	—	—	—	Open the original filing on SEC.gov
Nov 12, 2025	Picker Donald H	CSO	AGRANT◆	200,000	—	—	—	Open the original filing on SEC.gov
Nov 12, 2025	Yan Joy	Director	AGRANT◆	150,000	—	—	—	Open the original filing on SEC.gov
Nov 12, 2025	Klemp Walter V	CEO and President	AGRANT◆	750,000	—	—	—	Open the original filing on SEC.gov
Nov 12, 2025	Klemp Walter V	CEO and President	AGRANT◆	830,000	—	—	—	Open the original filing on SEC.gov
Nov 12, 2025	George Robert E.	Director	AGRANT◆	150,000	—	—	—	Open the original filing on SEC.gov
Nov 12, 2025	Foster Jonathan P.	EVP & CFO	AGRANT◆	400,000	—	—	—	Open the original filing on SEC.gov
Nov 12, 2025	Foster Jonathan P.	EVP & CFO	AGRANT◆	600,000	—	—	—	Open the original filing on SEC.gov
Nov 12, 2025	Climaco John M	Director	AGRANT◆	150,000	—	—	—	Open the original filing on SEC.gov
Nov 12, 2025	Cermak Elizabeth	Director	AGRANT◆	150,000	—	—	—	Open the original filing on SEC.gov
Nov 12, 2025	Cannon Michael D	Director	AGRANT◆	150,000	—	—	—	Open the original filing on SEC.gov
Nov 4, 2025	Picker Donald H	Chief Science Officer	MEXER◆	8,750	—	—	—	Open the original filing on SEC.gov
Nov 4, 2025	Picker Donald H	Chief Science Officer	FTAX	2,131	$0.497	$1.1K	-11.3%	Open the original filing on SEC.gov
Nov 4, 2025	Picker Donald H	Chief Science Officer	MEXER	8,750	—	—	+86.2%	Open the original filing on SEC.gov
Nov 4, 2025	Klemp Walter V	CEO and President	MEXER◆	28,750	—	—	—	Open the original filing on SEC.gov
Nov 4, 2025	Klemp Walter V	CEO and President	FTAX	7,001	$0.497	$3.5K	-0.9%	Open the original filing on SEC.gov
Nov 4, 2025	Klemp Walter V	CEO and President	MEXER	28,750	—	—	+3.9%	Open the original filing on SEC.gov
Nov 4, 2025	Foster Jonathan P.	Chief Financial Officer	MEXER◆	20,625	—	—	—	Open the original filing on SEC.gov
Nov 4, 2025	Foster Jonathan P.	Chief Financial Officer	MEXER	5,023	$0.497	$2.5K	-1.6%	Open the original filing on SEC.gov
Nov 4, 2025	Foster Jonathan P.	Chief Financial Officer	MEXER	20,625	—	—	+7.2%	Open the original filing on SEC.gov
Jun 23, 2025	Klemp Walter V	CEO and President	PDBUY◆	2M	—	—	—	Open the original filing on SEC.gov
Jun 23, 2025	Klemp Walter V	CEO and President	PBUY	675,675	$0.37	$250K	+994.6%	Open the original filing on SEC.gov
Jun 23, 2025	Foster Jonathan P.	Chief Financial Officer	PDBUY◆	810,810	—	—	—	Open the original filing on SEC.gov
Jun 23, 2025	Foster Jonathan P.	Chief Financial Officer	PBUY	270,270	$0.37	$100K	+1,561%	Open the original filing on SEC.gov
Jun 22, 2025	Picker Donald H	Chief Science Officer	MEXER◆	1,766	—	—	—	Open the original filing on SEC.gov
Jun 22, 2025	Picker Donald H	Chief Science Officer	FTAX	430	$0.267	$115	-4.1%	Open the original filing on SEC.gov
Jun 22, 2025	Picker Donald H	Chief Science Officer	MEXER	1,766	—	—	+20.0%	Open the original filing on SEC.gov
Jun 22, 2025	Klemp Walter V	CEO and President	MEXER◆	8,990	—	—	—	Open the original filing on SEC.gov
Jun 22, 2025	Klemp Walter V	CEO and President	FTAX	2,190	$0.267	$585	-3.1%	Open the original filing on SEC.gov
Jun 22, 2025	Klemp Walter V	CEO and President	MEXER	8,990	—	—	+14.7%	Open the original filing on SEC.gov
Jun 22, 2025	Foster Jonathan P.	Chief Financial Officer	MEXER◆	4,328	—	—	—	Open the original filing on SEC.gov
Jun 22, 2025	Foster Jonathan P.	Chief Financial Officer	FTAX	1,054	$0.267	$281	-5.7%	Open the original filing on SEC.gov
Jun 22, 2025	Foster Jonathan P.	Chief Financial Officer	MEXER	4,328	—	—	+30.8%	Open the original filing on SEC.gov
Jun 20, 2025	Picker Donald H	Chief Science Officer	MEXER◆	1,078	—	—	—	Open the original filing on SEC.gov
Jun 20, 2025	Picker Donald H	Chief Science Officer	FTAX	263	$0.267	$70	-2.9%	Open the original filing on SEC.gov
Jun 20, 2025	Picker Donald H	Chief Science Officer	MEXER	1,078	—	—	+13.5%	Open the original filing on SEC.gov
Jun 20, 2025	Klemp Walter V	CEO and President	MEXER◆	3,750	—	—	—	Open the original filing on SEC.gov
Jun 20, 2025	Klemp Walter V	CEO and President	FTAX	914	$0.267	$244	-1.5%	Open the original filing on SEC.gov
Jun 20, 2025	Klemp Walter V	CEO and President	MEXER	3,750	—	—	+6.4%	Open the original filing on SEC.gov
Jun 20, 2025	Foster Jonathan P.	Chief Financial Officer	MEXER◆	2,711	—	—	—	Open the original filing on SEC.gov
Jun 20, 2025	Foster Jonathan P.	Chief Financial Officer	FTAX	661	$0.267	$176	-4.5%	Open the original filing on SEC.gov
Jun 20, 2025	Foster Jonathan P.	Chief Financial Officer	MEXER	2,711	—	—	+22.6%	Open the original filing on SEC.gov
Jun 16, 2025	Klemp Walter V	CEO and President	MEXER◆	1,667	—	—	—	Open the original filing on SEC.gov
Jun 16, 2025	Klemp Walter V	CEO and President	FTAX	406	$0.6852	$278	-0.7%	Open the original filing on SEC.gov
Jun 16, 2025	Klemp Walter V	CEO and President	MEXER	1,667	—	—	+2.9%	Open the original filing on SEC.gov
Jun 16, 2025	Foster Jonathan P.	Chief Financial Officer	MEXER◆	833	—	—	—	Open the original filing on SEC.gov
Jun 16, 2025	Foster Jonathan P.	Chief Financial Officer	FTAX	203	$0.6852	$139	-1.7%	Open the original filing on SEC.gov
Jun 16, 2025	Foster Jonathan P.	Chief Financial Officer	MEXER	833	—	—	+7.3%	Open the original filing on SEC.gov

PDBUY◆—

Picker Donald H · Chief Science…Aug 3

519,999 sh

PBUY★—

Picker Donald H · Chief Science…Aug 3

173,333 sh · +23,019% own

AGRANT◆—

Klemp Walter V · CEO and PresidentAug 3

1.6M sh

PBUY—

Klemp Walter V · CEO and PresidentAug 3

533,333 sh · +1,720% own

PDBUY◆—

Foster Jonathan P. · Chief Financial…Aug 3

879,999 sh

PBUY—

Foster Jonathan P. · Chief Financial…Aug 3

293,333 sh · +2,377% own

MEXER◆—

Picker Donald H · Chief Science…Jun 22

71 sh

FTAX$66

Picker Donald H · Chief Science…Jun 22

21 sh @ $3.12 · -2.7% own

MEXER—

Picker Donald H · Chief Science…Jun 22

71 sh · +10.1% own

MEXER◆—

Klemp Walter V · CEO and PresidentJun 22

360 sh

FTAX$275

Klemp Walter V · CEO and PresidentJun 22

88 sh @ $3.12 · -0.3% own

MEXER—

Klemp Walter V · CEO and PresidentJun 22

360 sh · +1.2% own

MEXER◆—

Foster Jonathan P. · Chief Financial…Jun 22

174 sh

FTAX$128

Foster Jonathan P. · Chief Financial…Jun 22

41 sh @ $3.12 · -0.3% own

MEXER—

Foster Jonathan P. · Chief Financial…Jun 22

174 sh · +1.4% own

MEXER◆—

Picker Donald H · Chief Science…Jun 20

44 sh

FTAX$37

Picker Donald H · Chief Science…Jun 20

13 sh @ $2.88 · -1.8% own

MEXER—

Picker Donald H · Chief Science…Jun 20

44 sh · +6.6% own

MEXER◆—

Klemp Walter V · CEO and PresidentJun 20

150 sh

FTAX$107

Klemp Walter V · CEO and PresidentJun 20

37 sh @ $2.88 · -0.1% own

MEXER—

Klemp Walter V · CEO and PresidentJun 20

150 sh · +0.5% own

MEXER◆—

Foster Jonathan P. · Chief Financial…Jun 20

109 sh

FTAX$89

Foster Jonathan P. · Chief Financial…Jun 20

31 sh @ $2.88 · -0.3% own

MEXER—

Foster Jonathan P. · Chief Financial…Jun 20

109 sh · +0.9% own

AGRANT◆—

Picker Donald H · CSONov 12, 2025

200,000 sh

AGRANT◆—

Picker Donald H · CSONov 12, 2025

200,000 sh

AGRANT◆—

Yan Joy · DirectorNov 12, 2025

150,000 sh

AGRANT◆—

Klemp Walter V · CEO and PresidentNov 12, 2025

750,000 sh

AGRANT◆—

Klemp Walter V · CEO and PresidentNov 12, 2025

830,000 sh

AGRANT◆—

George Robert E. · DirectorNov 12, 2025

150,000 sh

AGRANT◆—

Foster Jonathan P. · EVP & CFONov 12, 2025

400,000 sh

AGRANT◆—

Foster Jonathan P. · EVP & CFONov 12, 2025

600,000 sh

AGRANT◆—

Climaco John M · DirectorNov 12, 2025

150,000 sh

AGRANT◆—

Cermak Elizabeth · DirectorNov 12, 2025

150,000 sh

AGRANT◆—

Cannon Michael D · DirectorNov 12, 2025

150,000 sh

MEXER◆—

Picker Donald H · Chief Science…Nov 4, 2025

8,750 sh

FTAX$1.1K

Picker Donald H · Chief Science…Nov 4, 2025

2,131 sh @ $0.497 · -11.3% own

MEXER—

Picker Donald H · Chief Science…Nov 4, 2025

8,750 sh · +86.2% own

MEXER◆—

Klemp Walter V · CEO and PresidentNov 4, 2025

28,750 sh

FTAX$3.5K

Klemp Walter V · CEO and PresidentNov 4, 2025

7,001 sh @ $0.497 · -0.9% own

MEXER—

Klemp Walter V · CEO and PresidentNov 4, 2025

28,750 sh · +3.9% own

MEXER◆—

Foster Jonathan P. · Chief Financial…Nov 4, 2025

20,625 sh

MEXER$2.5K

Foster Jonathan P. · Chief Financial…Nov 4, 2025

5,023 sh @ $0.497 · -1.6% own

MEXER—

Foster Jonathan P. · Chief Financial…Nov 4, 2025

20,625 sh · +7.2% own

PDBUY◆—

Klemp Walter V · CEO and PresidentJun 23, 2025

2M sh

PBUY$250K

Klemp Walter V · CEO and PresidentJun 23, 2025

675,675 sh @ $0.37 · +994.6% own

PDBUY◆—

Foster Jonathan P. · Chief Financial…Jun 23, 2025

810,810 sh

PBUY$100K

Foster Jonathan P. · Chief Financial…Jun 23, 2025

270,270 sh @ $0.37 · +1,561% own

MEXER◆—

Picker Donald H · Chief Science…Jun 22, 2025

1,766 sh

FTAX$115

Picker Donald H · Chief Science…Jun 22, 2025

430 sh @ $0.267 · -4.1% own

MEXER—

Picker Donald H · Chief Science…Jun 22, 2025

1,766 sh · +20.0% own

MEXER◆—

Klemp Walter V · CEO and PresidentJun 22, 2025

8,990 sh

FTAX$585

Klemp Walter V · CEO and PresidentJun 22, 2025

2,190 sh @ $0.267 · -3.1% own

MEXER—

Klemp Walter V · CEO and PresidentJun 22, 2025

8,990 sh · +14.7% own

MEXER◆—

Foster Jonathan P. · Chief Financial…Jun 22, 2025

4,328 sh

FTAX$281

Foster Jonathan P. · Chief Financial…Jun 22, 2025

1,054 sh @ $0.267 · -5.7% own

MEXER—

Foster Jonathan P. · Chief Financial…Jun 22, 2025

4,328 sh · +30.8% own

MEXER◆—

Picker Donald H · Chief Science…Jun 20, 2025

1,078 sh

FTAX$70

Picker Donald H · Chief Science…Jun 20, 2025

263 sh @ $0.267 · -2.9% own

MEXER—

Picker Donald H · Chief Science…Jun 20, 2025

1,078 sh · +13.5% own

MEXER◆—

Klemp Walter V · CEO and PresidentJun 20, 2025

3,750 sh

FTAX$244

Klemp Walter V · CEO and PresidentJun 20, 2025

914 sh @ $0.267 · -1.5% own

MEXER—

Klemp Walter V · CEO and PresidentJun 20, 2025

3,750 sh · +6.4% own

MEXER◆—

Foster Jonathan P. · Chief Financial…Jun 20, 2025

2,711 sh

FTAX$176

Foster Jonathan P. · Chief Financial…Jun 20, 2025

661 sh @ $0.267 · -4.5% own

MEXER—

Foster Jonathan P. · Chief Financial…Jun 20, 2025

2,711 sh · +22.6% own

MEXER◆—

Klemp Walter V · CEO and PresidentJun 16, 2025

1,667 sh

FTAX$278

Klemp Walter V · CEO and PresidentJun 16, 2025

406 sh @ $0.6852 · -0.7% own

MEXER—

Klemp Walter V · CEO and PresidentJun 16, 2025

1,667 sh · +2.9% own

MEXER◆—

Foster Jonathan P. · Chief Financial…Jun 16, 2025

833 sh

FTAX$139

Foster Jonathan P. · Chief Financial…Jun 16, 2025

203 sh @ $0.6852 · -1.7% own

MEXER—

Foster Jonathan P. · Chief Financial…Jun 16, 2025

833 sh · +7.3% own

Filing record

How quickly insiders here report their trades. Section 16 allows two business days from the transaction.

All 22 filings we hold were filed within the two-business-day deadline.

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays. How this is measured · All late filings

Insiders at this company

Everyone who has filed a Form 4 for this issuer.

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