KLEMP WALTER V (CEO and President) purchased 994.6% of their position (675.67K shares) of MOLECULIN BIOTECH, INC. on the open market

Open‑market purchase worth $250.0K — a major conviction buy. The strongest form of insider conviction signal.

P · 1 purchase

KLEMP WALTER V

Filed: 6/23/2025ACC: 0001437749-25-021050

InsiderKLEMP WALTER VCIK 938419

→

IssuerMOLECULIN BIOTECH, INC.CIK 1659617

DirectorOfficer· CEO and President

Since Jul 2019

-1.35M

Net shares

Net seller

$828.77

Total sold

Open market trades

1B · 0S

Total transactions

688.41K acquired · 2.04M disposed

Non-Derivative Transactions5

Common Stock

Direct

M · Option Exercise

+3.75K

Price / share

—

Trade value

—

% of position

6.4%

6/20/2025

58.30K→62.05K

Common Stock

Direct

F · Tax Withholding

−914.00

Price / share

$0.27

Trade value

$244.04

% of position

1.5%

6/20/2025

62.05K→61.13K

Common Stock

Direct

M · Option Exercise

+8.99K

Price / share

—

Trade value

—

% of position

14.7%

6/22/2025

61.13K→70.12K

Common Stock

Direct

F · Tax Withholding

−2.19K

Price / share

$0.27

Trade value

$584.73

% of position

3.1%

6/22/2025

70.12K→67.93K

Common Stock

Direct

P · Purchase

+675.67K

Price / share

$0.37

Trade value

$250K

% of position

994.6%

6/23/2025

67.93K→743.61K

Total

Net shares

+685.31K

Net value

$249.17K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	6/20/2025	M · Option Exercise	+3.75K	—	—	6.4%	58.30K	62.05K
Common Stock Direct	6/20/2025	F · Tax Withholding	−914.00	$0.27	$244.04	1.5%	62.05K	61.13K
Common Stock Direct	6/22/2025	M · Option Exercise	+8.99K	—	—	14.7%	61.13K	70.12K
Common Stock Direct	6/22/2025	F · Tax Withholding	−2.19K	$0.27	$584.73	3.1%	70.12K	67.93K
Common Stock Direct	6/23/2025	P · Purchase	+675.67K	$0.37	$250K	994.6%	67.93K	743.61K
Total			+685.31K		$249.17K

Derivative Transactions3

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

3.75K shares

−3.75K

Strike price

Held after

391.45K

Exercisable

—

6/20/2025

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

8.99K shares

−8.99K

Strike price

Held after

382.46K

Exercisable

—

6/22/2025

Series E Warrants

Direct

P · Purchase

Converts to

Common Stock

2.03M shares

−2.03M

Strike price

0.37

Held after

2.41M

Exercisable

—

6/23/2025

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Restricted Stock Units Direct	Common Stock3.75K shares	6/20/2025	M · Option Exercise	−3.75K		—	391.45K
Restricted Stock Units Direct	Common Stock8.99K shares	6/22/2025	M · Option Exercise	−8.99K		—	382.46K
Series E Warrants Direct	Common Stock2.03M shares	6/23/2025	P · Purchase	−2.03M	0.37	—	2.41M