List of insiders holdings for Summit Therapeutics Inc.:
- Shares directly owned by the insider.
- Shares indirectly owned by the insider.
- Total shares owned by the insider (sum of shares directly and indirectly owned).
- Total market value if available.
- Shares are not adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
What is insider trading>>
- Peter Lynch
What is insider trading>>
| # | Insider Holder Name | Report Date Time | Shares Owned Directly Indirectly | Total Shares Owned | Filing |
| 1 | Zanganeh Mahkam Co-Chief Executive Officer 10% Owner | 2026-06-12 14:35:11 | 31,000 609,984,809 | 610,015,809 | Form 4 |
| 2 | DUGGAN ROBERT W Co-Chief Executive Officer 10% Owner | 2026-06-12 12:28:50 | 573,883,879 36,131,930 | 610,015,809 | Form 4 |
| 3 | Soni Manmeet Singh COO and CFO | 2026-06-04 16:40:51 | 3,123,603 0 | 3,123,603 | Form 4 |
| 4 | Stefanov Ventzislav See Remarks | 2020-09-18 16:13:00 | 1,442,173 0 | 1,442,173 | Form 3 |
| 5 | Powell David Jonathan Chief Scientific Officer | 2020-12-01 19:45:50 | 1,213,298 0 | 1,213,298 | Form 4 |
| 6 | Donaldson Michael Paul Chief Financial Officer | 2021-02-23 17:59:25 | 594,890 0 | 594,890 | Form 4 |
| 7 | Houbiers Jos Chief Medical Officer | 2020-09-18 16:16:41 | 416,800 0 | 416,800 | Form 3 |
| 8 | Graham Camilla Chief Clinical Affairs Officer | 2020-10-07 19:47:55 | 400,000 0 | 400,000 | Form 4 |
| 9 | Gayko Urte Director | 2022-04-26 16:36:58 | 400,000 0 | 400,000 | Form 4 |
| 10 | Dhingra Ankur Chief Financial Officer | 2024-03-27 20:27:03 | 0 354,958 | 354,958 | Form 4 |
| 11 | Anand Bhaskar Chief Accounting Officer | 2026-10-14 16:07:18 | 261,047 0 | 261,047 | Form 4 |
| 12 | Erdtmann Rainer M Director | 2021-02-23 18:01:57 | 252,273 0 | 252,273 | Form 4 |
| 13 | Wang Luhua Director | 2021-03-02 17:36:53 | 161,096 0 | 161,096 | Form 4 |
| 14 | Mahatme Ujwala Director | 2024-01-04 16:22:08 | 122,575 0 | 122,575 | Form 4 |
| 15 | Clark Kenneth A Director | 2026-01-06 18:43:10 | 52,796 0 | 52,796 | Form 4 |
| 16 | Huber Jeff Director | 2026-01-06 18:49:36 | 44,885 0 | 44,885 | Form 4 |
| 17 | Booth Robert F. Director | 2026-01-06 18:55:18 | 42,180 0 | 42,180 | Form 4 |
| 18 | Cesano Alessandra Director | 2026-01-06 18:39:57 | 38,219 0 | 38,219 | Form 4 |
| 19 | Ronaghi Mostafa Director | 2026-01-06 18:44:55 | 35,000 0 | 35,000 | Form 4 |
| 20 | Xia Yu Director | 2026-01-06 18:52:50 | 35,000 0 | 35,000 | Form 4 |
| 21 | Maranian Jeffrey R VP Corporate Controller | 2021-12-17 16:09:41 | 15,000 0 | 15,000 | Form 4 |