Moleculin Biotech, Inc.
Moleculin Biotech, Inc. (MBRX) Insider Trading
Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.
SEC EDGAR · FMP · MBRX · as of Jun 8, 2026
Activity summary
Buy transactions
4
P-Purchase only
Sell transactions
0
12 Months
Buy/Sell ratio
∞
Buy/Sell (by trades)
Overall sentiment
Moleculin Biotech, Inc. insiders have been net buyers of shares over the past 12 Months, which may signal confidence in the company's outlook.
▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only
As of Jun 8, 2026
MBRX insider buying and selling by quarter
MBRX insider selling · MBRX insider buying stocks · quarterly insider activity
Mobile shows last 4Q · Desktop shows full 8Q
▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters
As of Jun 8, 2026
Active insiders
Most active in past 12 months · MBRX ceo insider trading
Showing all insiders · Click a card to filter the transactions table below
▸ Aggregated from reportingName · top 5 by trade count (12M) · no extra API
Recent insider transactions
MBRX executive sell shares · MBRX board member insider trading · MBRX insider trading SEC filing
Scroll horizontally to see all columns
| Date | Insider | Type | Shares | Value | Filing |
|---|---|---|---|---|---|
| Nov 4, 2025 | PICKER DONALD H Chief Science Officer | Option | 8,750 | — | Form 4 |
| Nov 4, 2025 | PICKER DONALD H Chief Science Officer | Other | 2,131 | $1K | Form 4 |
| Nov 4, 2025 | KLEMP WALTER V CEO and President · Director | Option | 28,750 | — | Form 4 |
| Nov 4, 2025 | KLEMP WALTER V CEO and President · Director | Other | 7,001 | $3K | Form 4 |
| Nov 4, 2025 | Foster Jonathan P. CFO | Option | 20,625 | — | Form 4 |
| Nov 4, 2025 | Foster Jonathan P. CFO | Option | 5,023 | $2K | Form 4 |
| Jun 23, 2025 | Foster Jonathan P. CFO | Purchase | 270,270 | $100K | Form 4 |
| Jun 22, 2025 | Foster Jonathan P. CFO | Option | 4,328 | — | Form 4 |
| Jun 22, 2025 | Foster Jonathan P. CFO | Other | 1,054 | $281 | Form 4 |
| Jun 20, 2025 | Foster Jonathan P. CFO | Option | 2,711 | — | Form 4 |
| Jun 20, 2025 | Foster Jonathan P. CFO | Other | 661 | $176 | Form 4 |
| Jun 23, 2025 | KLEMP WALTER V CEO and President · Director | Purchase | 675,675 | $250K | Form 4 |
| Jun 22, 2025 | KLEMP WALTER V CEO and President · Director | Option | 8,990 | — | Form 4 |
| Jun 22, 2025 | KLEMP WALTER V CEO and President · Director | Other | 2,190 | $585 | Form 4 |
| Jun 20, 2025 | KLEMP WALTER V CEO and President · Director | Option | 3,750 | — | Form 4 |
| Jun 20, 2025 | KLEMP WALTER V CEO and President · Director | Other | 914 | $244 | Form 4 |
| Jun 22, 2025 | PICKER DONALD H Chief Science Officer | Option | 1,766 | — | Form 4 |
| Jun 22, 2025 | PICKER DONALD H Chief Science Officer | Other | 430 | $115 | Form 4 |
| Jun 20, 2025 | PICKER DONALD H Chief Science Officer | Option | 1,078 | — | Form 4 |
| Jun 20, 2025 | PICKER DONALD H Chief Science Officer | Other | 263 | $70 | Form 4 |
| Jun 16, 2025 | Foster Jonathan P. CFO | Option | 833 | — | Form 4 |
| Jun 16, 2025 | Foster Jonathan P. CFO | Other | 203 | $139 | Form 4 |
| Jun 16, 2025 | KLEMP WALTER V CEO and President · Director | Option | 1,667 | — | Form 4 |
| Jun 16, 2025 | KLEMP WALTER V CEO and President · Director | Other | 406 | $278 | Form 4 |
| Jul 2, 2024 | KLEMP WALTER V CEO and President · Director | Option | 982 | — | Form 4 |
PICKER DONALD H
Chief Science Officer
Date
Nov 4
Shares
2,131
Price
$0.50
Value
$1K
KLEMP WALTER V
CEO and President · Director
Date
Nov 4
Shares
28,750
Price
—
Value
—
KLEMP WALTER V
CEO and President · Director
Date
Nov 4
Shares
7,001
Price
$0.50
Value
$3K
KLEMP WALTER V
CEO and President · Director
Date
Jun 23
Shares
675,675
Price
$0.37
Value
$250K
KLEMP WALTER V
CEO and President · Director
Date
Jun 22
Shares
8,990
Price
—
Value
—
KLEMP WALTER V
CEO and President · Director
Date
Jun 22
Shares
2,190
Price
$0.27
Value
$585
KLEMP WALTER V
CEO and President · Director
Date
Jun 20
Shares
3,750
Price
—
Value
—
KLEMP WALTER V
CEO and President · Director
Date
Jun 20
Shares
914
Price
$0.27
Value
$244
PICKER DONALD H
Chief Science Officer
Date
Jun 22
Shares
430
Price
$0.27
Value
$115
PICKER DONALD H
Chief Science Officer
Date
Jun 20
Shares
263
Price
$0.27
Value
$70
KLEMP WALTER V
CEO and President · Director
Date
Jun 16
Shares
1,667
Price
—
Value
—
KLEMP WALTER V
CEO and President · Director
Date
Jun 16
Shares
406
Price
$0.69
Value
$278
KLEMP WALTER V
CEO and President · Director
Date
Jul 2
Shares
982
Price
—
Value
—
⚡ = value ≥ $1M · Award/Option price shows — · formType=4 · securityName=Common Stock · url → sec.gov/Archives/edgar
▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —
About MBRX insider trading
MBRX insider trades
Moleculin Biotech, Inc. (MBRX) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including KLEMP WALTER V (CEO and President · Director), Foster Jonathan P. (CFO), PICKER DONALD H (Chief Science Officer). Over the past 12 months, 3 insiders have filed transactions with the SEC. MBRX insiders have been primarily buying, which may reflect pre-scheduled Rule 10b5-1 plan executions.
For Moleculin Biotech, Inc.'s institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →
Frequently asked questions
MBRX insider trading · 5 questionsThe insiders of Moleculin Biotech, Inc. (MBRX) include executives and directors such as KLEMP WALTER V (CEO and President · Director), Foster Jonathan P. (CFO), PICKER DONALD H (Chief Science Officer), among others. Over the past 12 months, 3 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.
▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 8, 2026