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.
Holders of 5% or more of SMMT
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Summit Therapeutics Inc., largest stake first. The change is against the holder's previous filing.
No holder currently reports owning 5% or more of Summit Therapeutics Inc. on Schedule 13D or 13G.
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
5 Schedule 13D and 13G filings on Summit Therapeutics Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Feb 14, 2022 | Polar Capital Holdings Plc | 13G/AOld format | – | – | – | SEC |
| May 14, 2021 | Duggan Robert W | 13D/AOld format | – | – | – | SEC |
| Apr 22, 2021 | Duggan Robert W | 13D/AOld format | – | – | – | SEC |
| Mar 26, 2021 | Duggan Robert W | 13D/AOld format | – | – | – | SEC |
| Feb 16, 2021 | Polar Capital Holdings Plc | 13GOld format | – | New | – | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Summit Therapeutics Inc. shares.
No Form 144 notices for Summit Therapeutics Inc. are on file.