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Nasdaq · CIK 0001659617

MBRX Moleculin Biotech, Inc.

Insider trading from SEC Form 4. Last filing Nov 14, 2025. Close $0.44 on Oct 9, 2026, +15% from the 52-week low and -97% from the high.

Last 90 days

Net insider value
$0
no open-market trades
Buys
0
$0 by 0 insiders
Sells
0
$0 by 0 insiders
Insiders on file
8
with a Form 4 at this company

Price and insider trades, last year

MBRXOct 9, 2026 · close 0.44

Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™

Signals

Open-market buys and sells at Moleculin Biotech, Inc., scored.

ScoreInsiderValueHoldingsPrice contextFiled
50ModerateJonathan P. Foster
Chief Financial Officer
buy
$100k
270,270 shares
+1561%-
56ModerateWalter Klemp V
CEO and President
buy
$250k
675,675 shares
+995%-

Transactions

The last 62 rows filed, every code.

DateInsiderTransactionSharesPriceValueHoldings afterFiled
Nov 12, 2025Elizabeth Cermak
director
AGrant or award
Stock Options (right to buy)derivative
+150,000--164,668Nov 14, 2025
Nov 12, 2025John M Climaco
director
AGrant or award
Stock Options (right to buy)derivative
+150,000--165,169Nov 14, 2025
Nov 12, 2025Jonathan P. Foster
EVP & CFO
AGrant or award
Stock option (right to buy)derivative
+600,000--1,617,695Nov 14, 2025
Nov 12, 2025Robert E. George
director
AGrant or award
Stock Options (right to buy)derivative
+150,000--165,336Nov 14, 2025
Nov 12, 2025Walter Klemp V
CEO and President
AGrant or award
Stock option (right to buy)derivative
+830,000--3,210,731Nov 14, 2025
Nov 12, 2025Joy Yan
director
AGrant or award
Stock Options (right to buy)derivative
+150,000--164,001Nov 14, 2025
Nov 12, 2025Donald H Picker
CSO
AGrant or award
Stock option (right to buy)derivative
+200,000--295,508Nov 14, 2025
Nov 12, 2025Michael D Cannon
director
AGrant or award
Stock Options (right to buy)derivative
+150,000--165,336Nov 14, 2025
Nov 12, 2025Jonathan P. Foster
EVP & CFO
AGrant or award
Performance Based Restricted Stock Unitsderivative
+400,000--2,017,695Nov 14, 2025
Nov 12, 2025Walter Klemp V
CEO and President
AGrant or award
Performance Based Restricted Stock Unitsderivative
+750,000--3,960,731Nov 14, 2025
Nov 12, 2025Donald H Picker
CSO
AGrant or award
Performance Based Restricted Stock Unitsderivative
+200,000--495,508Nov 14, 2025
Nov 4, 2025Jonathan P. Foster
Chief Financial Officer
MOption exercise
Common Stock
+20,625--308,212Nov 6, 2025
Nov 4, 2025Walter Klemp V
CEO and President
MOption exercise
Common Stock
+28,750--772,357Nov 6, 2025
Nov 4, 2025Donald H Picker
Chief Science Officer
MOption exercise
Common Stock
+8,750--18,902Nov 6, 2025
Nov 4, 2025Walter Klemp V
CEO and President
FTax withholding
Common Stock
-7,001$0.50$3,480765,356Nov 6, 2025
Nov 4, 2025Donald H Picker
Chief Science Officer
FTax withholding
Common Stock
-2,131$0.50$1,05916,771Nov 6, 2025
Nov 4, 2025Jonathan P. Foster
Chief Financial Officer
MOption exercise
Common Stock
-5,023$0.50$2,496303,189Nov 6, 2025
Nov 4, 2025Walter Klemp V
CEO and President
MOption exercise
Restricted Stock Unitsderivative
-28,750$0.00$02,380,731Nov 6, 2025
Nov 4, 2025Jonathan P. Foster
Chief Financial Officer
MOption exercise
Restricted Stock Unitsderivative
-20,625$0.00$01,017,695Nov 6, 2025
Nov 4, 2025Donald H Picker
Chief Science Officer
MOption exercise
Restricted Stock Unitsderivative
-8,750$0.00$095,508Nov 6, 2025
Jun 20, 2025Donald H Picker
Chief Science Officer
MOption exercise
Common Stock
+1,078--9,079Jun 23, 2025
Jun 20, 2025Walter Klemp V
CEO and President
MOption exercise
Common Stock
+3,750--62,046Jun 23, 2025
Jun 20, 2025Jonathan P. Foster
Chief Financial Officer
MOption exercise
Common Stock
+2,711--14,704Jun 23, 2025
Jun 20, 2025Donald H Picker
Chief Science Officer
FTax withholding
Common Stock
-263$0.27$708,816Jun 23, 2025
Jun 20, 2025Walter Klemp V
CEO and President
FTax withholding
Common Stock
-914$0.27$24461,132Jun 23, 2025
Jun 20, 2025Jonathan P. Foster
Chief Financial Officer
FTax withholding
Common Stock
-661$0.27$17614,043Jun 23, 2025
Jun 22, 2025Jonathan P. Foster
Chief Financial Officer
MOption exercise
Common Stock
+4,328--18,371Jun 23, 2025
Jun 22, 2025Walter Klemp V
CEO and President
MOption exercise
Common Stock
+8,990--70,122Jun 23, 2025
Jun 22, 2025Donald H Picker
Chief Science Officer
MOption exercise
Common Stock
+1,766--10,582Jun 23, 2025
Jun 22, 2025Donald H Picker
Chief Science Officer
FTax withholding
Common Stock
-430$0.27$11510,152Jun 23, 2025
Jun 22, 2025Walter Klemp V
CEO and President
FTax withholding
Common Stock
-2,190$0.27$58567,932Jun 23, 2025
Jun 22, 2025Jonathan P. Foster
Chief Financial Officer
FTax withholding
Common Stock
-1,054$0.27$28117,317Jun 23, 2025
Jun 23, 2025Walter Klemp V
CEO and President
POpen-market purchase
Common Stock
+675,675$0.37$250k743,607Jun 23, 2025
Jun 23, 2025Jonathan P. Foster
Chief Financial Officer
POpen-market purchase
Common Stock
+270,270$0.37$100k287,587Jun 23, 2025
Jun 20, 2025Donald H Picker
Chief Science Officer
MOption exercise
Restricted Stock Unitsderivative
-1,078$0.00$0106,024Jun 23, 2025
Jun 22, 2025Donald H Picker
Chief Science Officer
MOption exercise
Restricted Stock Unitsderivative
-1,766$0.00$0104,258Jun 23, 2025
Jun 20, 2025Jonathan P. Foster
Chief Financial Officer
MOption exercise
Restricted Stock Unitsderivative
-2,711$0.00$0231,838Jun 23, 2025
Jun 20, 2025Walter Klemp V
CEO and President
MOption exercise
Restricted Stock Unitsderivative
-3,750$0.00$0391,446Jun 23, 2025
Jun 22, 2025Jonathan P. Foster
Chief Financial Officer
MOption exercise
Restricted Stock Unitsderivative
-4,328$0.00$0227,510Jun 23, 2025
Jun 22, 2025Walter Klemp V
CEO and President
MOption exercise
Restricted Stock Unitsderivative
-8,990$0.00$0382,456Jun 23, 2025
Jun 23, 2025Walter Klemp V
CEO and President
POpen-market purchase
Series E Warrantsderivative
-2,027,025--2,409,481Jun 23, 2025
Jun 23, 2025Jonathan P. Foster
Chief Financial Officer
POpen-market purchase
Series E Warrantsderivative
-810,810--1,038,320Jun 23, 2025
Jun 16, 2025Jonathan P. Foster
Chief Financial Officer
MOption exercise
Common Stock
+833--12,196Jun 18, 2025
Jun 16, 2025Walter Klemp V
CEO and President
MOption exercise
Common Stock
+1,667--58,702Jun 18, 2025
Jun 16, 2025Walter Klemp V
CEO and President
FTax withholding
Common Stock
-406$0.69$27858,296Jun 18, 2025
Jun 16, 2025Jonathan P. Foster
Chief Financial Officer
FTax withholding
Common Stock
-203$0.69$13911,993Jun 18, 2025
Jun 16, 2025Walter Klemp V
CEO and President
MOption exercise
Restricted Stock Unitsderivative
-1,667$0.00$0370,075Jun 18, 2025
Jun 16, 2025Jonathan P. Foster
Chief Financial Officer
MOption exercise
Restricted Stock Unitsderivative
-833$0.00$0230,684Jun 18, 2025
Nov 4, 2024Robert E. George
director
AGrant or award
Stock option (right to buy)derivative
+10,000--15,336Nov 6, 2024
Nov 4, 2024Joy Yan
director
AGrant or award
Stock option (right to buy)derivative
+10,000--14,001Nov 6, 2024
Nov 4, 2024Donald H Picker
Chief Science Officer
AGrant or award
Stock option (right to buy)derivative
+40,000--66,358Nov 6, 2024
Nov 4, 2024Walter Klemp V
CEO and President
AGrant or award
Stock option (right to buy)derivative
+100,000--213,152Nov 6, 2024
Nov 4, 2024Jonathan P. Foster
Chief Financial Officer
AGrant or award
Stock option (right to buy)derivative
+65,000--129,837Nov 6, 2024
Nov 4, 2024John M Climaco
director
AGrant or award
Stock option (right to buy)derivative
+10,000--15,169Nov 6, 2024
Nov 4, 2024Elizabeth Cermak
director
AGrant or award
Stock option (right to buy)derivative
+10,000--14,668Nov 6, 2024
Nov 4, 2024Michael D Cannon
director
AGrant or award
Stock option (right to buy)derivative
+10,000--15,336Nov 6, 2024
Nov 4, 2024Jonathan P. Foster
Chief Financial Officer
AGrant or award
Restricted Stock Unitsderivative
+82,500--212,337Nov 6, 2024
Nov 4, 2024Walter Klemp V
CEO and President
AGrant or award
Restricted Stock Unitsderivative
+115,000--328,152Nov 6, 2024
Nov 4, 2024Donald H Picker
Chief Science Officer
AGrant or award
Restricted Stock Unitsderivative
+35,000--101,358Nov 6, 2024
Oct 25, 2024Jonathan P. Foster
Chief Financial Officer
AGrant or award
Performance Based Restricted Stock Unitsderivative
+19,180--231,517Nov 6, 2024
Oct 25, 2024Walter Klemp V
CEO and President
AGrant or award
Performance Based Restricted Stock Unitsderivative
+43,590--371,742Nov 6, 2024
Oct 25, 2024Donald H Picker
Chief Science Officer
AGrant or award
Performance Based Restricted Stock Unitsderivative
+5,744--107,102Nov 6, 2024

Insiders

Everyone who has filed a Form 4 here.

Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.

MBRX insider trading: Moleculin Biotech, Inc. | InsiderTell