SMMT insider buying
2 cluster buysSummit Therapeutics Inc. · Healthcare
When two or more insiders at Summit Therapeutics Inc. buy SMMT on the open market around the same time, that clustered conviction is one of the highest-signal patterns in SEC filing data. Below is every cluster we've detected in SMMT plus the full record of qualifying open-market buys, each parsed directly from Form 4 filings and linked back to the source on SEC EDGAR.
Detected clusters
- Jun 4 – Jun 12, 2026Detected Jun 12, 2026High conviction3 insidersTotal bought$103.6MMarket cap$12.4B
- Sep 10 – Oct 21, 2025Detected Oct 21, 2025High conviction3 insidersTotal bought$22.8MMarket cap$12.4B
All notable open-market buys in SMMT
Every open-market Form 4 purchase, newest first. Click an insider to see their full buying record across companies.
| Date | Insider | Shares | Price | Value | Filing |
|---|---|---|---|---|---|
| Jun 12, 2026 | DUGGAN ROBERT Wcluster Director, Co-Chief Executive Officer, 10% Owner | 3,810,000 | $13.12 | $50.0M | SEC ↗ |
| Jun 12, 2026 | Zanganeh Mahkamcluster Director, Co-Chief Executive Officer, 10% Owner | 3,810,000 | $13.12 | $50.0M | SEC ↗ |
| Jun 4, 2026 | DUGGAN ROBERT Wcluster Director, Co-Chief Executive Officer, 10% Owner | 100,000 | $14.60 | $1.5M | SEC ↗ |
| Jun 4, 2026 | Zanganeh Mahkamcluster Director, Co-Chief Executive Officer, 10% Owner | 100,000 | $14.60 | $1.5M | SEC ↗ |
| Jun 4, 2026 | Soni Manmeet Singhcluster Director, COO and CFO | 25,000 | $14.46 | $361.5K | SEC ↗ |
| Jun 4, 2026 | Soni Manmeet Singhcluster Director, COO and CFO | 25,000 | $14.43 | $360.8K | SEC ↗ |
| Oct 21, 2025 | Xia Yucluster Director | 533,617 | $18.74 | $10.0M | SEC ↗ |
| Oct 21, 2025 | DUGGAN ROBERT Wcluster Director, Co-Chief Executive Officer, 10% Owner | 26,680 | $18.74 | $500.0K | SEC ↗ |
| Oct 21, 2025 | Zanganeh Mahkamcluster Director, Co-Chief Executive Officer, 10% Owner | 26,680 | $18.74 | $500.0K | SEC ↗ |
| Sep 10, 2025 | Zanganeh Mahkamcluster Director, Co-Chief Executive Officer, 10% Owner | 333,394 | $17.68 | $5.9M | SEC ↗ |
| Sep 10, 2025 | DUGGAN ROBERT Wcluster Director, Co-Chief Executive Officer, 10% Owner | 333,394 | $17.68 | $5.9M | SEC ↗ |
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SMMT insider buying — FAQ
- Are insiders buying SMMT stock?
- Yes — 4 distinct insiders have bought SMMT (Summit Therapeutics Inc.) on the open market, including 2 cluster buys where two or more insiders bought within a rolling window. The most recent qualifying activity was Jun 12, 2026.
- How much SMMT stock have insiders bought?
- Insiders have bought a combined $126.4M of SMMT across 11 open-market purchases, based on SEC Form 4 filings.
- What is an insider cluster buy in SMMT?
- A cluster buy is two or more distinct Summit Therapeutics Inc. insiders — officers, directors, or 10% owners — each buying SMMT on the open market within a rolling window. SMMT has 2 detected cluster buys to date.
- Where does this SMMT insider trading data come from?
- Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.
How we track insider buying in SMMT
We continuously poll SEC EDGAR for new Form 4 filings and parse every open-market purchase (transaction code P). A cluster is recorded when two or more distinct insiders — officers, directors, or 10% owners — each buy SMMT within a rolling window. We track clusters at every company size, from micro-caps to mega-caps. Every figure on this page traces back to an official filing; open any row to jump straight to the source document. What counts as a cluster buy?
This page is informational and reflects public filing data. It is not investment advice or a recommendation regarding SMMT.