MBRX · Insider Trading
Moleculin Biotech, Inc.
Every open-market purchase and sale reported by MBRX officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-10-16 | Donald H Picker | Chief Science Officer | A | +250,000 deriv. | — |
| 2026-10-16 | Walter V Klemp | CEO and President | MIXED | +158,841 | −$18.01K |
| 2026-10-16 | Jonathan P. Foster | Chief Financial Officer | MIXED | +99,515 | −$11.28K |
| 2026-08-05 | Jonathan P. Foster | Chief Financial Officer | Buy | +293,333 | — |
| 2026-08-05 | Walter V Klemp | CEO and President | Buy | +533,333 | — |
| 2026-08-05 | Donald H Picker | Chief Science Officer | Buy | +173,333 | — |
| 2026-06-24 | Jonathan P. Foster | Chief Financial Officer | MIXED | +211 | −$217 |
| 2026-06-24 | Walter V Klemp | CEO and President | MIXED | +385 | −$381 |
| 2026-06-24 | Donald H Picker | Chief Science Officer | MIXED | +81 | −$103 |
| 2025-11-14 | Michael D Cannon | Director | A | +150,000 deriv. | — |
| 2025-11-14 | Elizabeth Cermak | Director | A | +150,000 deriv. | — |
| 2025-11-14 | Jonathan P. Foster | EVP & CFO | A | +1,000,000 deriv. | — |
| 2025-11-14 | John M Climaco | Director | A | +150,000 deriv. | — |
| 2025-11-14 | Joy Yan | Director | A | +150,000 deriv. | — |
| 2025-11-14 | Robert E. George | Director | A | +150,000 deriv. | — |
| 2025-11-14 | Walter V Klemp | CEO and President | A | +1,580,000 deriv. | — |
| 2025-11-14 | Donald H Picker | CSO | A | +400,000 deriv. | — |
| 2025-11-06 | Jonathan P. Foster | Chief Financial Officer | M | +15,602 | −$2.50K |
| 2025-11-06 | Donald H Picker | Chief Science Officer | MIXED | +6,619 | −$1.06K |
| 2025-11-06 | Walter V Klemp | CEO and President | MIXED | +21,749 | −$3.48K |
| 2025-06-23 | Walter V Klemp | CEO and President | MIXED | +685,311 | +$249.17K |
| 2025-06-23 | Donald H Picker | Chief Science Officer | MIXED | +2,151 | −$185 |
| 2025-06-23 | Jonathan P. Foster | Chief Financial Officer | MIXED | +275,594 | +$99.54K |
| 2025-06-18 | Jonathan P. Foster | Chief Financial Officer | MIXED | +630 | −$139 |
| 2025-06-18 | Walter V Klemp | CEO and President | MIXED | +1,261 | −$278 |
| 2024-11-06 | Michael D Cannon | Director | A | +10,000 deriv. | — |
| 2024-11-06 | John M Climaco | Director | A | +10,000 deriv. | — |
| 2024-11-06 | Joy Yan | Director | A | +10,000 deriv. | — |
| 2024-11-06 | Jonathan P. Foster | Chief Financial Officer | A | +166,680 deriv. | — |
| 2024-11-06 | Elizabeth Cermak | Director | A | +10,000 deriv. | — |
| 2024-11-06 | Robert E. George | Director | A | +10,000 deriv. | — |
| 2024-11-06 | Walter V Klemp | CEO and President | A | +258,590 deriv. | — |
| 2024-11-06 | Donald H Picker | Chief Science Officer | A | +80,744 deriv. | — |
| 2024-07-05 | Walter V Klemp | CEO and President | MIXED | +742 | −$857 |
| 2024-06-25 | Donald H Picker | Chief Science Officer | MIXED | +2,290 | +$1.96K |
| 2024-06-25 | Jonathan P. Foster | Chief Financial Officer | MIXED | +3,276 | −$3.94K |
| 2024-06-25 | Walter V Klemp | CEO and President | MIXED | +6,800 | −$8.19K |
| 2024-06-21 | Jonathan P. Foster | Chief Financial Officer | MIXED | +2,076 | −$2.40K |
| 2024-06-21 | Walter V Klemp | CEO and President | MIXED | +2,836 | −$3.45K |
| 2024-06-21 | Donald H Picker | Chief Science Officer | MIXED | +758 | −$1.21K |
| 2024-06-18 | Jonathan P. Foster | Chief Financial Officer | MIXED | +638 | −$811 |
| 2024-06-18 | Walter V Klemp | CEO and President | MIXED | +1,261 | −$1.68K |
| 2023-12-27 | Robert E. George | Director | Buy | +14,493 | +$10.00K |
| 2023-12-27 | Walter V Klemp | CEO and President | Buy | +188,404 | +$130.00K |
| 2023-12-27 | Jonathan P. Foster | Chief Financial Officer | Buy | +28,986 | +$20.00K |
| 2023-07-13 | Walter V Klemp | CEO and President | MIXED | +9,988 | −$1.90K |
| 2023-07-05 | Walter V Klemp | CEO and President | MIXED | +11,133 | −$2.07K |
| 2023-06-26 | Donald H Picker | Chief Science Officer | A | +205,938 deriv. | — |
| 2023-06-26 | Walter V Klemp | CEO and President | A | +939,375 deriv. | — |
| 2023-06-26 | Jonathan P. Foster | Chief Financial Officer | A | +409,688 deriv. | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Walter V Klemp | CEO and President | 38,592 | $273.42K |
| Jonathan P. Foster | Chief Financial Officer | 20,259 | $143.54K |
| Donald H Picker | Chief Science Officer | 8,704 | $61.67K |
| Robert E. George | Director | 2 | $14 |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the MBRX quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.