Summit Therapeutics Inc. — Insider Transactions
Form 4 filings by directors, officers, and 10%+ shareholders
SEC rules require corporate insiders — including directors, executive officers, and any shareholder owning more than 10% of a company's shares — to report changes in their ownership within two business days of a transaction. These disclosures are filed as Form 4. Open-market purchases (code P) are generally considered the most meaningful signal, as insiders are spending their own money.
| Insider | Title | Type | Shares | Price | Value | Owns After | Date |
|---|---|---|---|---|---|---|---|
| Xia Yu | — | Purchase | 533,617 | $18.74 | $9,999,983 | 32,057,147 | Oct 21, 2025 |
| Anand Bhaskar | Chief Accounting Officer | Award / Grant | 26,680 | $18.74 | $499,983 | 159,751 | Oct 21, 2025 |
| Soni Manmeet Singh | COO and CFO | Award / Grant | 53,361 | $18.74 | $999,985 | 3,073,603 | Oct 21, 2025 |
| DUGGAN ROBERT W | Co-Chief Executive Officer | Award / Grant | 13,980,789 | $18.74 | $261,999,986 | 570,073,879 | Oct 21, 2025 |
| Zanganeh Mahkam | Co-Chief Executive Officer | Award / Grant | 13,980,789 | $18.74 | $261,999,986 | 570,073,879 | Oct 21, 2025 |
| Zanganeh Mahkam | Co-Chief Executive Officer | Purchase | 5,000 | $18.07 | $90,350 | 556,093,090 | Sep 10, 2025 |
| DUGGAN ROBERT W | Co-Chief Executive Officer | Purchase | 5,000 | $18.07 | $90,350 | 556,093,090 | Sep 10, 2025 |
| Zanganeh Mahkam | Co-Chief Executive Officer | Option Exercise | 74,545 | $2.64 | $196,799 | 555,754,696 | May 30, 2025 |
| DUGGAN ROBERT W | Co-Chief Executive Officer | Option Exercise | 74,545 | $2.64 | $196,799 | 555,754,696 | May 30, 2025 |
| Zanganeh Mahkam | Co-Chief Executive Officer | X | 3,985,055 | $1.58 | $6,296,387 | 555,680,151 | Apr 8, 2025 |
| DUGGAN ROBERT W | Co-Chief Executive Officer | X | 3,985,055 | $1.58 | $6,296,387 | 555,680,151 | Apr 8, 2025 |
| Zanganeh Mahkam | Co-Chief Executive Officer | X | 315,681 | $1.58 | $498,776 | 10,199,776 | Oct 3, 2024 |
| Zanganeh Mahkam | Co-Chief Executive Officer | Award / Grant | 44,052 | $22.70 | $999,980 | 24,967,852 | Sep 11, 2024 |
| DUGGAN ROBERT W | Co-Chief Executive Officer | Award / Grant | 3,325,991 | $22.70 | $75,499,996 | 551,695,096 | Sep 11, 2024 |
| Huber Jeff | — | Award / Grant | 44,052 | $22.70 | $999,980 | 44,052 | Sep 11, 2024 |
| Soni Manmeet Singh | COO and CFO | Award / Grant | 44,052 | $22.70 | $999,980 | 3,020,242 | Sep 11, 2024 |
| Anand Bhaskar | Chief Accounting Officer | Award / Grant | 22,026 | $22.70 | $499,990 | 131,426 | Sep 11, 2024 |
| Zanganeh Mahkam | Chief Executive Officer | Purchase | 26,000 | $3.72 | $96,720 | 520,814 | Mar 27, 2024 |
| Dhingra Ankur | Chief Financial Officer | Purchase | 100,000 | $3.75 | $375,000 | 354,958 | Mar 26, 2024 |
| Dhingra Ankur | Chief Financial Officer | Purchase | 19,700 | $2.17 | $42,749 | 254,958 | Dec 13, 2023 |
| Zanganeh Mahkam | Chief Executive Officer | X | 489,814 | $1.44 | $705,332 | 489,814 | Dec 11, 2023 |
| Soni Manmeet Singh | Chief Operating Officer | Purchase | 2,976,190 | $1.68 | $4,999,999 | 2,976,190 | Oct 13, 2023 |
| Zanganeh Mahkam | Co-CEO & President | Purchase | 6,748,629 | $1.05 | $7,086,060 | 9,884,095 | Mar 8, 2023 |
| Zanganeh Mahkam | Co-Chief Executive Officer | Purchase | 804,672 | $1.05 | $844,906 | 1,178,529 | Mar 8, 2023 |
| Xia Yu | — | Purchase | 10,000,000 | $2.51 | $25,100,000 | 10,000,000 | Mar 7, 2023 |
| Dhingra Ankur | Chief Financial Officer | Purchase | 196,362 | $1.05 | $206,180 | 234,558 | Mar 7, 2023 |
| DUGGAN ROBERT W | Chief Executive Officer | Purchase | 376,489,880 | $1.05 | $395,314,374 | 552,354,161 | Mar 6, 2023 |
| Zanganeh Mahkam | Co-CEO & President | Other | 373,857 | — | — | 10,930,849 | Dec 6, 2022 |
| DUGGAN ROBERT W | Chief Executive Officer | Other | 9,346,434 | — | — | 171,879,226 | Dec 6, 2022 |
| Dhingra Ankur | Chief Financial Officer | Purchase | 13,027 | $0.97 | $12,636 | 39,527 | Aug 16, 2022 |
| DUGGAN ROBERT W | Chief Executive Officer | Purchase | 94,849,203 | $0.97 | $92,003,727 | 162,532,792 | Aug 16, 2022 |
| Zanganeh Maky | Co-CEO & President | Purchase | 1,030,925 | $0.97 | $999,997 | 3,135,466 | Aug 16, 2022 |
| Dhingra Ankur | Chief Financial Officer | Purchase | 11,557 | $0.97 | $11,210 | 38,057 | Aug 16, 2022 |
| DUGGAN ROBERT W | Chief Executive Officer | Other | 21,135 | — | — | 67,683,589 | May 23, 2022 |
| DUGGAN ROBERT W | Chief Executive Officer | Purchase | 11,365,921 | $5.24 | $59,557,426 | 67,662,454 | May 12, 2021 |
| Zanganeh Maky | Chief Operating Officer | Purchase | 389,077 | $5.24 | $2,038,763 | 2,643,319 | May 12, 2021 |
| Powell David Jonathan | Chief Scientific Officer | Sale | 29,569 | $4.39 | $129,808 | — | Nov 30, 2020 |
| Powell David Jonathan | Chief Scientific Officer | Option Exercise | 11,374 | $1.92 | $21,838 | 11,374 | Nov 23, 2020 |
| DUGGAN ROBERT W | Chief Executive Officer | Purchase | 14,071,856 | $3.34 | $46,999,999 | 56,296,533 | Nov 6, 2020 |