MBRX

insider transactions

Moleculin Biotech, Inc. — buys & sells by directors, officers and 10% owners (SEC Form 4).

30D 90D 1Y

Cluster buy signal: 2 different insiders made open-market purchases in the last 365 days, totalling $350.0K.

Net shares · 365d

+3.8M

3.8M buy · 0 sell

Net value · 365d

$350.0K

$350.0K in · $0 out

Sentiment · 365d

Net buying

100% buying · 0% selling

Open-market trades · 365d

3.8M buy · 0 sell

Net buy / sell volume

Tap or hover the chart for daily net volume. Green = net buying, red = net selling.

All transactions

Grant·A
Nov 12, 25

Cermak Elizabeth

Director

—

150.0K sh

Own +1023%
Grant·A
Nov 12, 25

Yan Joy

Director

—

150.0K sh

Own +1071%
Grant·A
Nov 12, 25

Climaco John M

Director

—

150.0K sh

Own +989%
Grant·A
Nov 12, 25

PICKER DONALD H

CSO

—

200.0K sh

Own +68%
Grant·A
Nov 12, 25

PICKER DONALD H

CSO

—

200.0K sh

Own +209%
Grant·A
Nov 12, 25

George Robert E.

Director

—

150.0K sh

Own +978%
Grant·A
Nov 12, 25

KLEMP WALTER V KEY

CEO and President

—

750.0K sh

Own +23%
Grant·A
Nov 12, 25

KLEMP WALTER V KEY

CEO and President

—

830.0K sh

Own +35%
Grant·A
Nov 12, 25

Foster Jonathan P. KEY

EVP & CFO

—

400.0K sh

Own +25%
Grant·A
Nov 12, 25

Foster Jonathan P. KEY

EVP & CFO

—

600.0K sh

Own +59%
Grant·A
Nov 12, 25

CANNON MICHAEL D

Director

—

150.0K sh

Own +978%
Exercise·M
Nov 4, 25

Foster Jonathan P. KEY

Chief Financial Officer

$0

20.6K sh

Own +2%
Exercise·M
Nov 4, 25

Foster Jonathan P. KEY

Chief Financial Officer

$2.5K

5.0K sh · $0.50

Own +2%
Exercise·M
Nov 4, 25

Foster Jonathan P. KEY

Chief Financial Officer

—

20.6K sh

Own +7%
Exercise·M
Nov 4, 25

PICKER DONALD H

Chief Science Officer

$0

8.8K sh

Own +10%
Exercise·M
Nov 4, 25

PICKER DONALD H

Chief Science Officer

—

8.8K sh

Own +86%
Other·F
Nov 4, 25

PICKER DONALD H

Chief Science Officer

$1.1K

2.1K sh · $0.50

Own -11%
Exercise·M
Nov 4, 25

KLEMP WALTER V KEY

CEO and President

$0

28.8K sh

Own +1%
Other·F
Nov 4, 25

KLEMP WALTER V KEY

CEO and President

$3.5K

7.0K sh · $0.50

Own -1%
Exercise·M
Nov 4, 25

KLEMP WALTER V KEY

CEO and President

—

28.8K sh

Own +4%
Buy·P
Jun 23, 25

KLEMP WALTER V KEY

CEO and President

—

2.0M sh

Own +530%
Buy·P
Jun 23, 25

KLEMP WALTER V KEY

CEO and President

$250.0K

675.7K sh · $0.37

Own +995%
Buy·P
Jun 23, 25

Foster Jonathan P. KEY

Chief Financial Officer

—

810.8K sh

Own +356%
Buy·P
Jun 23, 25

Foster Jonathan P. KEY

Chief Financial Officer

$100.0K

270.3K sh · $0.37

Own +1561%
Exercise·M
Jun 22, 25

KLEMP WALTER V KEY

CEO and President

$0

9.0K sh

Own +2%
Exercise·M
Jun 22, 25

KLEMP WALTER V KEY

CEO and President

—

9.0K sh

Own +15%
Other·F
Jun 22, 25

KLEMP WALTER V KEY

CEO and President

$591

2.2K sh · $0.27

Own -3%
Exercise·M
Jun 22, 25

Foster Jonathan P. KEY

Chief Financial Officer

$0

4.3K sh

Own +2%
Exercise·M
Jun 22, 25

Foster Jonathan P. KEY

Chief Financial Officer

—

4.3K sh

Own +31%
Other·F
Jun 22, 25

Foster Jonathan P. KEY

Chief Financial Officer

$285

1.1K sh · $0.27

Own -6%
Exercise·M
Jun 22, 25

PICKER DONALD H

Chief Science Officer

$0

1.8K sh

Own +2%
Exercise·M
Jun 22, 25

PICKER DONALD H

Chief Science Officer

—

1.8K sh

Own +20%
Other·F
Jun 22, 25

PICKER DONALD H

Chief Science Officer

$116

430 sh · $0.27

Own -4%

Date▾	Insider	Role	Type	Shares	Own Δ	Price	Value
Nov 12, 2025	Cermak Elizabeth	Director	Grant A	150.0K	+1023%	—	—
Nov 12, 2025	Yan Joy	Director	Grant A	150.0K	+1071%	—	—
Nov 12, 2025	Climaco John M	Director	Grant A	150.0K	+989%	—	—
Nov 12, 2025	PICKER DONALD H	CSO	Grant A	200.0K	+68%	—	—
Nov 12, 2025	PICKER DONALD H	CSO	Grant A	200.0K	+209%	—	—
Nov 12, 2025	George Robert E.	Director	Grant A	150.0K	+978%	—	—
Nov 12, 2025	KLEMP WALTER V KEY	CEO and President	Grant A	750.0K	+23%	—	—
Nov 12, 2025	KLEMP WALTER V KEY	CEO and President	Grant A	830.0K	+35%	—	—
Nov 12, 2025	Foster Jonathan P. KEY	EVP & CFO	Grant A	400.0K	+25%	—	—
Nov 12, 2025	Foster Jonathan P. KEY	EVP & CFO	Grant A	600.0K	+59%	—	—
Nov 12, 2025	CANNON MICHAEL D	Director	Grant A	150.0K	+978%	—	—
Nov 4, 2025	Foster Jonathan P. KEY	Chief Financial Officer	Exercise M	20.6K	+2%	—	$0
Nov 4, 2025	Foster Jonathan P. KEY	Chief Financial Officer	Exercise M	5.0K	+2%	$0.50	$2.5K
Nov 4, 2025	Foster Jonathan P. KEY	Chief Financial Officer	Exercise M	20.6K	+7%	—	—
Nov 4, 2025	PICKER DONALD H	Chief Science Officer	Exercise M	8.8K	+10%	—	$0
Nov 4, 2025	PICKER DONALD H	Chief Science Officer	Exercise M	8.8K	+86%	—	—
Nov 4, 2025	PICKER DONALD H	Chief Science Officer	Other F	2.1K	-11%	$0.50	$1.1K
Nov 4, 2025	KLEMP WALTER V KEY	CEO and President	Exercise M	28.8K	+1%	—	$0
Nov 4, 2025	KLEMP WALTER V KEY	CEO and President	Other F	7.0K	-1%	$0.50	$3.5K
Nov 4, 2025	KLEMP WALTER V KEY	CEO and President	Exercise M	28.8K	+4%	—	—
Jun 23, 2025	KLEMP WALTER V KEY	CEO and President	Buy P	2.0M	+530%	—	—
Jun 23, 2025	KLEMP WALTER V KEY	CEO and President	Buy P	675.7K	+995%	$0.37	$250.0K
Jun 23, 2025	Foster Jonathan P. KEY	Chief Financial Officer	Buy P	810.8K	+356%	—	—
Jun 23, 2025	Foster Jonathan P. KEY	Chief Financial Officer	Buy P	270.3K	+1561%	$0.37	$100.0K
Jun 22, 2025	KLEMP WALTER V KEY	CEO and President	Exercise M	9.0K	+2%	—	$0
Jun 22, 2025	KLEMP WALTER V KEY	CEO and President	Exercise M	9.0K	+15%	—	—
Jun 22, 2025	KLEMP WALTER V KEY	CEO and President	Other F	2.2K	-3%	$0.27	$591
Jun 22, 2025	Foster Jonathan P. KEY	Chief Financial Officer	Exercise M	4.3K	+2%	—	$0
Jun 22, 2025	Foster Jonathan P. KEY	Chief Financial Officer	Exercise M	4.3K	+31%	—	—
Jun 22, 2025	Foster Jonathan P. KEY	Chief Financial Officer	Other F	1.1K	-6%	$0.27	$285
Jun 22, 2025	PICKER DONALD H	Chief Science Officer	Exercise M	1.8K	+2%	—	$0
Jun 22, 2025	PICKER DONALD H	Chief Science Officer	Exercise M	1.8K	+20%	—	—
Jun 22, 2025	PICKER DONALD H	Chief Science Officer	Other F	430	-4%	$0.27	$116

About MBRX insider trading

This page tracks insider transactions for Moleculin Biotech, Inc. (MBRX) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.