SMMTHealthcareLarge-Cap
Summit Therapeutics Inc. Insider Trading Activity
Every SEC Form 4 insider transaction reported for Summit Therapeutics Inc. (SMMT), sourced directly from SEC EDGAR and updated as new filings are accepted.
By Trabud Research Team · SEC Form 4 & insider trading data analysts
Last updated:
Quick Answer
Are SMMT insiders buying or selling?
Summit Therapeutics Inc. insiders reported 26 open-market buys ($783.7M) and 2 sells ($321.5K) across 28 Form 4 filings — a net buying position of $783.3M.
Source: SEC EDGAR Form 4
Key Statistics (as of Jun 12, 2026)
Total Form 4 filings
28
SEC EDGAR
Insider filers
6
Insider buys (26)
$783.7M
Insider sells (2)
$321.5K
Insider sentiment
Net buyingNet insider flow of $783.3M in net buying. 5 insider buys in the last 90 days.
Recent SMMT insider transactions
| Date | Insider | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jun 12, 2026 | Zanganeh Mahkam | Co-Chief Executive Officer | Purchase | 3.8M | $13.12 | $50.0M |
| Jun 12, 2026 | Robert W Duggan | Co-Chief Executive Officer | Purchase | 3.8M | $13.12 | $50.0M |
| Jun 4, 2026 | Robert W Duggan | Co-Chief Executive Officer | Purchase | 100.0K | $14.60 | $1.5M |
| Jun 4, 2026 | Zanganeh Mahkam | Co-Chief Executive Officer | Purchase | 100.0K | $14.60 | $1.5M |
| Jun 4, 2026 | Manmeet Singh Soni | COO and CFO | Purchase | 50.0K | $14.45 | $722.3K |
| Oct 24, 2025 | Yu Xia | Director | Purchase | 533.6K | $18.74 | $10.0M |
| Oct 23, 2025 | Robert W Duggan | Co-Chief Executive Officer | Purchase | 26.7K | $18.74 | $500.0K |
| Oct 23, 2025 | Zanganeh Mahkam | Co-Chief Executive Officer | Purchase | 26.7K | $18.74 | $500.0K |
| Sep 11, 2025 | Zanganeh Mahkam | Co-Chief Executive Officer | Purchase | 338.4K | $17.69 | $6.0M |
| Sep 11, 2025 | Robert W Duggan | Co-Chief Executive Officer | Purchase | 338.4K | $17.69 | $6.0M |
| Mar 28, 2024 | Zanganeh Mahkam | Chief Executive Officer | Purchase | 110.3K | $3.73 | $411.1K |
| Mar 28, 2024 | Ankur Dhingra | Chief Financial Officer | Purchase | 100.0K | $3.75 | $375.0K |
| Dec 13, 2023 | Zanganeh Mahkam | Chief Executive Officer | Purchase | 5.0K | $2.07 | $10.3K |
| Dec 13, 2023 | Ankur Dhingra | Chief Financial Officer | Purchase | 20.4K | $2.17 | $44.3K |
| Oct 16, 2023 | Manmeet Singh Soni | Chief Operating Officer | Purchase | 3.0M | $1.68 | $5.0M |
| Mar 13, 2023 | Zanganeh Mahkam | Co-CEO & President | Purchase | 23.5M | $1.05 | $24.7M |
| Mar 9, 2023 | Zanganeh Mahkam | Co-Chief Executive Officer | Purchase | 23.5M | $1.05 | $24.7M |
| Mar 8, 2023 | Ankur Dhingra | Chief Financial Officer | Purchase | 196.4K | $1.05 | $206.2K |
| Mar 8, 2023 | Ankur Dhingra | Chief Financial Officer | Purchase | 37.7K | $0.97 | $36.6K |
| Mar 8, 2023 | Robert W Duggan | Chief Executive Officer | Purchase | 376.5M | $1.05 | $395.3M |
| Aug 18, 2022 | Robert W Duggan | Chief Executive Officer | Purchase | 94.8M | $0.97 | $92.0M |
| Aug 18, 2022 | Zanganeh Mahkam | Co-CEO & President | Purchase | 5.8M | $0.97 | $5.6M |
| Aug 17, 2022 | Ankur Dhingra | Chief Financial Officer | Purchase | 36.2K | $0.97 | $35.1K |
| May 14, 2021 | Robert W Duggan | Chief Executive Officer | Purchase | 11.4M | $5.24 | $59.6M |
| May 14, 2021 | Zanganeh Mahkam | Chief Operating Officer | Purchase | 389.1K | $5.24 | $2.0M |
Showing the 25 most recent of 28 Form 4 filings for Summit Therapeutics Inc..
Most active SMMT insiders
- Zanganeh Mahkam10 filings
- Robert W Duggan8 filings
- Ankur Dhingra5 filings
- David Jonathan Powell2 filings
- Manmeet Singh Soni2 filings
Ask anything about SMMT insider activity
Use Trabud's AI agent to query Summit Therapeutics Inc.'s Form 4 history in plain English — "Show me SMMT CEO purchases this year" or compare it against any other ticker.
Open the AI agentSMMT insider trading FAQ
Are Summit Therapeutics Inc. insiders buying or selling?
Across 28 SEC Form 4 filings, Summit Therapeutics Inc. (SMMT) insiders reported 26 open-market purchases totaling $783.7M and 2 sales totaling $321.5K. That is a net buying position of $783.3M.
How many insiders trade SMMT stock?
6 distinct insider filers — officers, directors, 10%+ owners, and investment groups filing jointly — have reported Form 4 transactions for Summit Therapeutics Inc.. The most recent filing was accepted on Jun 12, 2026.
Where does Trabud get SMMT insider trading data?
All SMMT insider trading data comes directly from official SEC EDGAR Form 4 filings, which corporate insiders must submit within two business days of a transaction under Section 16(a) of the Securities Exchange Act of 1934.
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