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

Insider Score Band 60–79

Research score, not a recommendation.

Total bought$11.0M3 Form 4 purchases

Distinct insiders3open-market buyers

Lead insiderZanganeh MahkamCEO

Cluster window2025-10-21single day · closed

Market data

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

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same price, one day All 3 purchases were at $18.74 on 2025-10-21. That pattern also occurs in IPO or conversion subscriptions, which are not open-market conviction buying.

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)

85%

Commitment purchase size relative to company & holdings

72%

Context buying into stock weakness signals conviction

95%

Timing coordinated purchases within a tight window

100%

Routine-purchase discount × 1.00

Company-type / offering discount × 0.50

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

Loading price history…

Transactions

3 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	Flags	Filing
2025-10-21	Xia Yu history of Xia Yu's purchases	Director	533,617	$18.74	$10.0M	offering	SEC filing for Xia Yu (opens in a new tab)
2025-10-21	Zanganeh Mahkam 8 purchases with a 63-day result · median +18.1%	CEO	26,680	$18.74	$500.0K	offering	SEC filing for Zanganeh Mahkam (opens in a new tab)
2025-10-21	DUGGAN ROBERT W 5 purchases with a 63-day result · median +16.7%	CEO	26,680	$18.74	$500.0K	offering	SEC filing for DUGGAN ROBERT W (opens in a new tab)
Total					$11.0M

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 -9.1%63 days -23.1%126 days +1.2%

Other insider buying runs at this company, newest first, with the return against the benchmark that followed
Window	Insiders	Total	Score	21 days	63 days	126 days	Status
2026-06-04 → 2026-06-12	3	$103.6M	81	+3.6%	+12.9%	–	active
2023-03-06 → 2023-03-08	3	$437.8M	76	+3.0%	+16.7%	-1.0%	closed
2022-08-16	3	$97.7M	78	+13.4%	-17.0%	+78.5%	closed