Insider Tracker SEC Form 4 insider trades
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SMMT

Summit Therapeutics Inc.

Healthcare Pharmaceutical Preparations Market cap: $12.4B All insider activity → Quote and statistics → Sign in to watch SMMT Sign in to set a price alert
76
Insider Score Band 60–79

Research score, not a recommendation.

Total bought$437.8M6 Form 4 purchases
Distinct insiders3open-market buyers
Lead insiderDUGGAN ROBERT WCEO
Cluster window2023-03-06 → 2023-03-08closed

Market data

Live quote and chart from Yahoo Finance, loaded through this server. Insider purchases are marked on the chart.

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Why this score

Research score: a weighted blend of the five factors, times the routine and offering discounts, minus the selling penalty.

Breadth number & diversity of participating insiders
37%
Seniority executive rank of buyers (CEO/CFO/Director)
100%
Commitment purchase size relative to company & holdings
100%
Context buying into stock weakness signals conviction
50%
Timing coordinated purchases within a tight window
100%
Routine-purchase discount × 1.00
Company-type / offering discount × 1.00
Net insider selling penalty − 0

Why are they buying?

No explanation has been generated for this cluster. The filings in the table below are the primary evidence.

Stock Price & Insider Purchase History

Daily close price with open-market insider purchases plotted over time

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Transactions

6 Form 4 trades · 3 insiders Sign in to download CSV
Purchases in this cluster, grouped by insider, largest first
Date Insider Role Shares Price Value Filing
2023-03-06 DUGGAN ROBERT W 5 purchases with a 63-day result · median +16.7% CEO 376,489,880 $1.05 $395.3M SEC filing for DUGGAN ROBERT W (opens in a new tab)
2023-03-08 Zanganeh Mahkam 8 purchases with a 63-day result · median +18.1% CEO 40,305,459 $1.05 avg $42.3M
2023-03-08 Zanganeh Mahkam 804,672 $1.05 $844.9K SEC filing for Zanganeh Mahkam (opens in a new tab)
2023-03-08 Zanganeh Mahkam 15,973,743 $1.05 $16.8M SEC filing for Zanganeh Mahkam (opens in a new tab)
2023-03-08 Zanganeh Mahkam 6,748,629 $1.05 $7.1M SEC filing for Zanganeh Mahkam (opens in a new tab)
2023-03-08 Zanganeh Mahkam 16,778,415 $1.05 $17.6M SEC filing for Zanganeh Mahkam (opens in a new tab)
2023-03-07 Dhingra Ankur 3 purchases with a 63-day result · median +66.7% CFO 196,362 $1.05 $206.2K SEC filing for Dhingra Ankur (opens in a new tab)
Total $437.8M

Other buying runs at SMMT

A run ends after a pause in the buying, so one company can have several. Returns are the stock's return minus its benchmark's (IWM for small companies, SPY otherwise), from the first open after the run became a cluster. Past results, not a forecast.

After this run became a cluster: 21 days +3.0%63 days +16.7%126 days -1.0%

Other insider buying runs at this company, newest first, with the return against the benchmark that followed
Window Insiders Total Score 21 days63 days126 days Status
2026-06-04 → 2026-06-12 3 $103.6M 81 +3.6%+12.9%– active
2025-10-21 3 $11.0M 71 -9.1%-23.1%+1.2% closed
2022-08-16 3 $97.7M 78 +13.4%-17.0%+78.5% closed