SMMT insider buying – Summit Therapeutics Inc.
20 insider purchases since 2016 worth $701.0M by 6 different insiders. Last 12 months: 3 purchases, $52.2M. Most recent filing: 2026-06-12.
Same time range as the chart above - each mark sits under the week of the trade. Circles = purchases (height = price paid, size = amount), red triangles = open-market sales of $50k+. Prices as reported, not adjusted for later stock splits. 3 older purchases (before the 5-year window) are listed in the table below.
Purchases are open-market buys (SEC Form 4, code "P") - insiders paying with their own money. Sales are open-market sales (code "S") of $50,000 or more; many sales are pre-planned (Rule 10b5-1) or made for taxes and diversification. Each row links to the original filing.
Bought, sold, still holding?
| Insider | Bought | First / last buy | Sold since 2016 | Holds now* | Status |
|---|---|---|---|---|---|
| DUGGAN ROBERT W CEO | $651.8M 8× · 501,051,934 sh | 2020-11-06 2026-06-12 | – | 610,015,809 shares as of 2026-06-12 | Holds - never sold |
| Zanganeh Mahkam CEO | $32.8M 5× · 29,840,574 sh | 2021-05-12 2024-03-26 | – | 610,015,809 shares as of 2026-06-12 | Holds - never sold |
| Xia Yu Director | $10.0M 1× · 533,617 sh | 2025-10-21 2025-10-21 | – | 32,057,147 shares as of 2025-10-23 | Holds - never sold |
| Soni Manmeet Singh CFO | $5.7M 2× · 3,026,190 sh | 2023-10-13 2026-06-04 | – | 3,098,603 shares as of 2026-06-04 | Holds - never sold |
| Dhingra Ankur CFO | $660,563 4× · 352,977 sh | 2022-08-16 2024-03-26 | – | 354,958 shares as of 2024-03-27 | Holds - never sold |
* Shares held after the insider's most recent SEC filing for this company (all share classes, direct and indirect). If an insider stops filing, later changes are not known.
Insider buying and selling by year
| Year | Purchases | Bought | Buyers | Sales | Sold |
|---|---|---|---|---|---|
| 2026 | 3 | $52.2M | 2 | – | – |
| 2025 | 3 | $16.5M | 2 | – | – |
| 2024 | 2 | $786,094 | 2 | – | – |
| 2023 | 6 | $425.3M | 4 | – | – |
| 2022 | 3 | $97.7M | 3 | – | – |
| 2021 | 2 | $61.6M | 2 | – | – |
| 2020 | 1 | $47.0M | 1 | 2 | $321,464 |
Insider purchases
| Filed | Insider | Role | Shares | Avg price | Value | Holdings | Filing |
|---|---|---|---|---|---|---|---|
| 2026-06-12 | DUGGAN ROBERT W | CEO | 3,810,000 | $13.12 | $50.0M | +0.7% | SEC |
| 2026-06-04 | Soni Manmeet Singh | CFO | 50,000 | $14.45 | $722,250 | +1.6% | SEC |
| 2026-06-04 | DUGGAN ROBERT W | CEO | 100,000 | $14.60 | $1.5M | +0.4% | SEC |
| 2025-10-23 | Xia Yu | Director | 533,617 | $18.74 | $10.0M | +1.7% | SEC |
| 2025-10-23 | DUGGAN ROBERT W | CEO | 26,680 | $18.74 | $499,983 | +53.4% | SEC |
| 2025-09-11 | DUGGAN ROBERT W | CEO | 338,394 | $17.69 | $6.0M | +0.1% | SEC |
| 2024-03-27 | Zanganeh Mahkam | CEO | 110,321 | $3.73 | $411,094 | +0.4% | SEC |
| 2024-03-27 | Dhingra Ankur | CFO | 100,000 | $3.75 | $375,000 | +39.2% | SEC |
| 2023-12-13 | Dhingra Ankur | CFO | 20,400 | $2.17 | $44,254 | +8.7% | SEC |
| 2023-12-13 | Zanganeh Mahkam | CEO | 5,000 | $2.07 | $10,350 | +1.0% | SEC |
| 2023-10-16 | Soni Manmeet Singh | Officer | 2,976,190 | $1.68 | $5.0M | SEC | |
| 2023-03-08 | Zanganeh Mahkam | CEO | 23,527,044 | $1.05 | $24.7M | SEC | |
| 2023-03-08 | Dhingra Ankur | CFO | 196,362 | $1.05 | $206,180 | +514.1% | SEC |
| 2023-03-08 | DUGGAN ROBERT W | CEO | 376,489,880 | $1.05 | $395.3M | +214.1% | SEC |
| 2022-08-18 | Zanganeh Maky | CEO | 5,809,132 | $0.97 | $5.6M | +463.8% | SEC |
| 2022-08-18 | DUGGAN ROBERT W | CEO | 94,849,203 | $0.97 | $92.0M | +140.1% | SEC |
| 2022-08-17 | Dhingra Ankur | CFO | 36,215 | $0.97 | $35,129 | +1828.1% | SEC |
| 2021-05-14 | Zanganeh Maky | Officer | 389,077 | $5.24 | $2.0M | +17.3% | SEC |
| 2021-05-14 | DUGGAN ROBERT W | CEO | 11,365,921 | $5.24 | $59.6M | +20.2% | SEC |
| 2020-11-10 | DUGGAN ROBERT W | CEO | 14,071,856 | $3.34 | $47.0M | +33.3% | SEC |
Insider sales
| Filed | Insider | Role | Shares | Avg price | Value | Type | Filing |
|---|---|---|---|---|---|---|---|
| 2020-12-01 | Powell David Jonathan | Officer | 43,282 | $4.41 | $190,694 | Sale | SEC |
| 2020-11-25 | Powell David Jonathan | Officer | 30,431 | $4.30 | $130,770 | Sale | SEC |
Compiled automatically from public SEC filings. Not investment advice. Get every new insider purchase in the daily report.
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