MBRX insider trading — Moleculin Biotech, Inc.
Over the last 90 days, insiders at Moleculin Biotech, Inc. (MBRX) made 3 open-market purchases worth $0 and 0 open-market sales worth $0, making them evenly split. The largest purchase was by Picker Donald H (Chief Science Officer), who bought 173,333 shares for $0 on Aug 3, 2026. 3 different insiders bought shares in this period — a cluster buy, which many investors watch closely.
Updated Oct 16, 2026.
Recent MBRX insider transactions
Every Form 4 filed by Moleculin Biotech, Inc. officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.
| Trade date | Insider | Role | Type | Ownership | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|---|
| Oct 15, 2026 | Klemp Walter V | CEO and President | M · Option exercise | Direct | 207,500 | — | — | Form 4 |
| Oct 15, 2026 | Klemp Walter V | CEO and President | F · Tax withholding | Direct | 48,659 | $0.37 | $18K | Form 4 |
| Oct 15, 2026 | Foster Jonathan P. | Chief Financial Officer | M · Option exercise | Direct | 130,000 | — | — | Form 4 |
| Oct 15, 2026 | Foster Jonathan P. | Chief Financial Officer | F · Tax withholding | Direct | 30,485 | $0.37 | $11K | Form 4 |
| Aug 3, 2026 | Foster Jonathan P. | Chief Financial Officer | P · Purchase | Direct | 293,333 | — | — | Form 4 |
| Aug 3, 2026 | Klemp Walter V | CEO and President | P · Purchase | Direct | 533,333 | — | — | Form 4 |
| Aug 3, 2026 | Picker Donald H | Chief Science Officer | P · Purchase | Direct | 173,333 | — | — | Form 4 |
MBRX insider trading FAQ
Are insiders buying MBRX stock?
Yes. In the last 90 days, Moleculin Biotech, Inc. insiders made 3 open-market purchases totaling $0, and no open-market sales. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).
Who are the insiders trading MBRX?
Recent buyers: Foster Jonathan P., Klemp Walter V, Picker Donald H.
Where does MBRX insider trading data come from?
Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.
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Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.