SMMT · Insider Trading
Summit Therapeutics Inc. Common Stock
Every open-market purchase and sale reported by SMMT 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 |
|---|---|---|---|---|---|
| 2026-10-14 | Bhaskar Anand | Chief Accounting Officer | A | +100,000 | — |
| 2026-06-12 | Robert W Duggan | Co-Chief Executive Officer | Buy | +3,810,000 | +$49.99M |
| 2026-06-12 | Mahkam Zanganeh | Co-Chief Executive Officer | Buy | +3,810,000 | +$49.99M |
| 2026-06-04 | Manmeet Singh Soni | COO and CFO | Buy | +50,000 | +$722.25K |
| 2026-06-04 | Mahkam Zanganeh | Co-Chief Executive Officer | Buy | +100,000 | +$1.46M |
| 2026-06-04 | Robert W Duggan | Co-Chief Executive Officer | Buy | +100,000 | +$1.46M |
| 2026-01-12 | Bhaskar Anand | Chief Accounting Officer | A | +30,000 deriv. | — |
| 2026-01-06 | Alessandra Cesano | Director | A | +38,219 deriv. | — |
| 2026-01-06 | Kenneth A Clark | Director | A | +52,796 deriv. | — |
| 2026-01-06 | Mostafa Ronaghi | Director | A | +35,000 deriv. | — |
| 2026-01-06 | Jeff Huber | Director | A | +44,885 deriv. | — |
| 2026-01-06 | Yu Xia | Director | A | +35,000 deriv. | — |
| 2026-01-06 | Robert F. Booth | Director | A | +42,180 deriv. | — |
| 2026-01-06 | Robert W Duggan | Co-Chief Executive Officer | A | +11,232 deriv. | — |
| 2026-01-06 | Mahkam Zanganeh | Co-Chief Executive Officer | A | +11,232 deriv. | — |
| 2025-10-23 | Mahkam Zanganeh | Co-Chief Executive Officer | MIXED | +14,274,277 | +$267.50M |
| 2025-10-23 | Robert W Duggan | Co-Chief Executive Officer | MIXED | +14,274,277 | +$267.50M |
| 2025-10-23 | Manmeet Singh Soni | COO and CFO | A | +53,361 | +$999.99K |
| 2025-10-23 | Bhaskar Anand | Chief Accounting Officer | A | +26,680 | +$499.98K |
| 2025-10-23 | Yu Xia | Director | Buy | +533,617 | +$10.00M |
| 2025-09-19 | Bhaskar Anand | Chief Accounting Officer | A | +50,000 deriv. | — |
| 2025-09-11 | Robert W Duggan | Co-Chief Executive Officer | Buy | +338,394 | +$5.98M |
| 2025-09-11 | Mahkam Zanganeh | Co-Chief Executive Officer | Buy | +338,394 | +$5.98M |
| 2025-06-02 | Robert W Duggan | Co-Chief Executive Officer | M | +74,545 | +$196.80K |
| 2025-06-02 | Mahkam Zanganeh | Co-Chief Executive Officer | M | +74,545 | +$196.80K |
| 2025-05-01 | Mahkam Zanganeh | Co-Chief Executive Officer | A | +11,030,558 deriv. | — |
| 2025-05-01 | Robert W Duggan | Co-Chief Executive Officer | A | +11,030,558 deriv. | — |
| 2025-05-01 | Manmeet Singh Soni | COO and CFO | A | +11,200,000 deriv. | — |
| 2025-05-01 | Bhaskar Anand | Chief Accounting Officer | A | +675,000 deriv. | — |
| 2025-04-09 | Robert W Duggan | Co-Chief Executive Officer | X | +3,985,055 | +$6.30M |
| 2025-04-09 | Mahkam Zanganeh | Co-Chief Executive Officer | X | +3,985,055 | +$6.30M |
| 2025-01-14 | Bhaskar Anand | Chief Accounting Officer | A | +75,000 deriv. | — |
| 2025-01-06 | Robert F. Booth | Director | A | +41,855 deriv. | — |
| 2025-01-06 | Kenneth A Clark | Director | A | +51,991 deriv. | — |
| 2025-01-06 | Mostafa Ronaghi | Director | A | +35,000 deriv. | — |
| 2025-01-06 | Alessandra Cesano | Director | A | +38,073 deriv. | — |
| 2025-01-06 | Yu Xia | Director | A | +40,438 deriv. | — |
| 2025-01-06 | Jeff Huber | Director | A | +35,000 deriv. | — |
| 2025-01-06 | Mahkam Zanganeh | Co-Chief Executive Officer | A | — | — |
| 2025-01-06 | Robert W Duggan | Co-Chief Executive Officer | A | — | — |
| 2024-10-15 | Kenneth A Clark | Director | A | +200,000 deriv. | — |
| 2024-10-03 | Mahkam Zanganeh | Co-Chief Executive Officer | X | +315,681 | +$498.78K |
| 2024-09-13 | Bhaskar Anand | Chief Accounting Officer | A | +22,026 | +$499.99K |
| 2024-09-13 | Manmeet Singh Soni | COO and CFO | A | +44,052 | +$999.98K |
| 2024-09-13 | Jeff Huber | Director | A | +44,052 | +$999.98K |
| 2024-09-13 | Robert W Duggan | Co-Chief Executive Officer | A | +3,325,991 | +$75.50M |
| 2024-09-13 | Mahkam Zanganeh | Co-Chief Executive Officer | A | +44,052 | +$999.98K |
| 2024-08-23 | Mahkam Zanganeh | Chief Executive Officer | A | +2,757,640 deriv. | — |
| 2024-08-23 | Manmeet Singh Soni | COO and CFO | A | +2,800,000 deriv. | — |
| 2024-06-27 | Jeff Huber | Director | A | +217,883 deriv. | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Robert W Duggan | Co-Chief Executive Officer | 599,708,353 | $9.18B |
| Yu Xia | Director | 32,057,147 | $490.96M |
| Mahkam Zanganeh | Co-Chief Executive Officer | 25,855,474 | $395.98M |
| Manmeet Singh Soni | COO and CFO | 3,098,603 | $47.46M |
| Bhaskar Anand | Chief Accounting Officer | 261,047 | $4.00M |
| Jeff Huber | Director | 6,000 | $91.89K |
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 SMMT 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.