Summit Therapeutics Inc.
SMMT- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001599298
No open-market purchases or sales by Summit Therapeutics Inc. insiders were filed in the last 90 days; 242 institutions reported holding it in 13F filings for Q2 2026, worth $1.98B in total; no superinvestor holds it.
Open-market trades, last 90 days
Open-market purchases (P) and sales (S) by Summit Therapeutics Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.
- Open-market buys
- 0 filings
- Open-market sells
- 0 filings
- Insiders trading
- 0
- Net value
- $0
- Purchases minus sales
Insider roster
Directors, officers and 10% owners who have filed a Form 4 for Summit Therapeutics Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.
| Name | Title | Last reported holding | Last filing | Filings, past year |
|---|---|---|---|---|
| Duggan Robert W | Co-Chief Executive Officer | 573,883,879 | Jun 12, 2026 | 4 |
| Zanganeh Maky | Co-Chief Executive Officer | 573,883,879Indirect | Jun 12, 2026 | 4 |
| Soni Manmeet Singh | COO and CFO | 3,123,603 | Jun 4, 2026 | 2 |
| Anand Bhaskar | Chief Accounting Officer | 159,751 | Jan 12, 2026 | 2 |
| Ronaghi Mostafa | Director | – | Jan 6, 2026 | 1 |
| Huber Jeff | Director | 44,052Indirect | Jan 6, 2026 | 1 |
| Booth Robert F. | Director | – | Jan 6, 2026 | 1 |
| Clark Kenneth A | Director | – | Jan 6, 2026 | 1 |
| Cesano Alessandra | Director | – | Jan 6, 2026 | 1 |
| Xia Yu | Director | 32,057,147Indirect | Jan 6, 2026 | 2 |
| Dhingra Ankur | Chief Financial Officer | 354,958Indirect | Mar 27, 2024 | 0 |
| Mahatme Ujwala | Director | – | Jan 4, 2024 | 0 |
| Gayko Urte | Director | – | Apr 26, 2022 | 0 |
| Maranian Jeffrey R | VP Corporate Controller | – | Dec 17, 2021 | 0 |
Insider trades
Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Jun 12, 2026 (view filing) | Jun 12 | Same day | Zanganeh MakyCo-Chief Executive Officer | PPurchase | +3.81M | $13.12 | +$50.0M | +0.7%573.9M after | Duplicate filing |
| Jun 12, 2026 (view filing) | Jun 12 | Same day | Duggan Robert WCo-Chief Executive Officer | PPurchase | +3.81M | $13.12 | +$50.0M | +0.7%573.9M after | |
| Jun 4, 2026 (view filing) | Jun 4 | Same day | Soni Manmeet SinghCOO and CFO | PPurchase | +50.0K | $14.45 | +$722.3K | +1.6%3.12M after | 2 lots |
| Jun 4, 2026 (view filing) | Jun 4 | Same day | Zanganeh MakyCo-Chief Executive Officer | PPurchase | +100.0K | $14.60 | +$1.46M | +0.4%25.8M after | Duplicate filing |
| Jun 4, 2026 (view filing) | Jun 4 | Same day | Duggan Robert WCo-Chief Executive Officer | PPurchase | +100.0K | $14.60 | +$1.46M | +0.4%25.8M after | |
| Oct 23, 2025 (view filing) | Oct 21 | 2 days | Xia YuDirector | PPurchase | +533.6K | $18.74 | +$10.0M | +1.7%32.1M after | |
| Oct 23, 2025 (view filing) | Oct 21 | 2 days | Zanganeh MakyCo-Chief Executive Officer | PPurchase | +26.7K | $18.74 | +$500.0K | +53.4%76.7K after | Duplicate filing |
| Oct 23, 2025 (view filing) | Oct 21 | 2 days | Duggan Robert WCo-Chief Executive Officer | PPurchase | +26.7K | $18.74 | +$500.0K | +53.4%76.7K after | |
| Sep 11, 2025 (view filing) | Sep 10-11 | 1 day | Zanganeh MakyCo-Chief Executive Officer | PPurchase | +338.4K | $17.69 | +$5.98M | +0.1%556.1M after | 2 lotsDuplicate filing |
| Sep 11, 2025 (view filing) | Sep 10-11 | 1 day | Duggan Robert WCo-Chief Executive Officer | PPurchase | +338.4K | $17.69 | +$5.98M | +0.1%556.1M after | 2 lots |
| Mar 27, 2024 (view filing) | Mar 27 | Same day | Zanganeh MakyChief Executive Officer | PPurchase | +26.0K | $3.72 | +$96.7K | +5.3%520.8K after | |
| Mar 27, 2024 (view filing) | Mar 26-27 | 1 day | Zanganeh MakyChief Executive Officer | PPurchase | +84.3K | $3.73 | +$314.4K | New position50.0K after | 3 lots |
| Mar 27, 2024 (view filing) | Mar 26 | 1 day | Dhingra AnkurChief Financial Officer | PPurchase | +100.0K | $3.75 | +$375.0K | +39.2%355.0K after | |
| Dec 13, 2023 (view filing) | Dec 12 | 1 day | Zanganeh MakyChief Executive Officer | PPurchase | +5.00K | $2.07 | +$10.3K | +1.0%494.8K after | |
| Dec 13, 2023 (view filing) | Dec 13 | Same day | Dhingra AnkurChief Financial Officer | PPurchase | +20.4K | $2.17 | +$44.3K | +8.7%255.0K after | 2 lots |
| Oct 16, 2023 (view filing) | Oct 13 | 3 days | Soni Manmeet SinghChief Operating Officer | PPurchase | +2.98M | $1.68 | +$5.00M | New position2.98M after | |
| Mar 13, 2023 (view filing) | Mar 8 | 5 days | Zanganeh MakyCo-CEO & President | PPurchase | +23.5M | $1.05 | +$24.7M | New position9.88M after | Amended2 lots |
| Mar 8, 2023 (view filing) | Mar 7 | 1 day | Dhingra AnkurChief Financial Officer | PPurchase | +196.4K | $1.05 | +$206.2K | +514.1%234.6K after | |
| Mar 8, 2023 (view filing) | Aug 16, 2022 | 204 days | Dhingra AnkurChief Financial Officer | PPurchase | +13.0K | $0.97 | +$12.6K | +49.2%39.5K after | Amended |
| Mar 8, 2023 (view filing) | Aug 16, 2022 | 204 days | Dhingra AnkurChief Financial Officer | PPurchase | +24.7K | $0.97 | +$23.9K | +182.1%38.2K after | Amended |
| Mar 8, 2023 (view filing) | Mar 6 | 2 days | Duggan Robert WChief Executive Officer | PPurchase | +376.5M | $1.05 | +$395.3M | +214.1%552.4M after | |
| Aug 18, 2022 (view filing) | Aug 16 | 2 days | Duggan Robert WChief Executive Officer | PPurchase | +94.8M | $0.97 | +$92.0M | +140.1%162.5M after | |
| Aug 18, 2022 (view filing) | Aug 16 | 2 days | Zanganeh MakyCo-CEO & President | PPurchase | +184.4K | $0.97 | +$178.9K | +105.1%360.0K after | |
| Aug 18, 2022 (view filing) | Aug 16 | 2 days | Zanganeh MakyCo-CEO & President | PPurchase | +5.62M | $0.97 | +$5.46M | New position3.14M after | 2 lots |