SMMT

Summit Therapeutics Inc.$17.45-0.96 (-5.24%)

Prev Close$18.42·MCap$14.00B·P/E—·Vol4.61M·Yield—

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Buys (12M)

$113.76M

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Sells (12M)

$0.00

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Net Activity

Net Buyer

$113.76M

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Active Insiders

last 12 mo

Over the past 12 months, insider activity at Summit Therapeutics Inc. (SMMT) has been exclusively buying, with 7 insider purchases totaling $113.76M and 0 insider sales totaling $0.00. The most recent insider transaction was by DUGGAN ROBERT W (director, 10 percent owner, officer: Co-Chief Executive Officer), who purchased $49.99M worth of shares on Jun 12, 2026. Summit Therapeutics Inc. operates in the Healthcare sector, within the Biotechnology industry, with a market cap of $14.00B.

SMMT Insider Trading Activity

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Jun 12, 2026	DUGGAN ROBERT W	director, 10 percent owner, officer: Co-Chief Executive Officer	Buy	3,810,000	$13.12	$49.99M	573,883,904
Jun 12, 2026	Zanganeh Mahkam	director, 10 percent owner, officer: Co-Chief Executive Officer	Buy	3,810,000	$13.12	$49.99M	573,883,904
Jun 4, 2026	Soni Manmeet Singh	director, officer: COO and CFO	Buy	25,000	$14.43	$360.8K	3,123,603
Jun 4, 2026	Zanganeh Mahkam	director, 10 percent owner, officer: Co-Chief Executive Officer	Buy	100,000	$14.60	$1.46M	25,824,474
Jun 4, 2026	DUGGAN ROBERT W	director, 10 percent owner, officer: Co-Chief Executive Officer	Buy	100,000	$14.60	$1.46M	25,824,474
Oct 21, 2025	DUGGAN ROBERT W	Co-Chief Executive Officer	Buy	26,680	$18.74	$500.0K	0
Oct 21, 2025	Xia Yu	Director	Buy	533,617	$18.74	$10.00M	0
Sep 10, 2025	Zanganeh Mahkam	Co-Chief Executive Officer	Buy	338,394	$17.69	$5.98M	0
Apr 8, 2025	Zanganeh Mahkam	Co-Chief Executive Officer	Sell	3,985,055	$1.58	$6.30M0.5% OS	0
Mar 27, 2024	Dhingra Ankur	Chief Financial Officer	Buy	100,000	$3.75	$375.0K	354,958+39%
Mar 27, 2024	Zanganeh Mahkam	Chief Executive Officer	Buy	110,321	$3.73	$411.1K	24,923,800
Dec 13, 2023	Dhingra Ankur	Chief Financial Officer	Buy	20,400	$2.17	$44.3K	254,958
Dec 13, 2023	Zanganeh Mahkam	Chief Executive Officer	Buy	5,000	$2.07	$10.3K	494,814
Oct 16, 2023	Soni Manmeet Singh	Chief Operating Officer	Buy	2,976,190	$1.68	$5.00M	2,976,190
Mar 8, 2023	Dhingra Ankur	Chief Financial Officer	Buy	196,362	$1.05	$206.2K	234,558+514%
Mar 8, 2023	DUGGAN ROBERT W	Chief Executive Officer	Buy	376,489,880	$1.05	$395.31M50.6% OS	552,354,176+214%
Mar 8, 2023	Zanganeh Mahkam	Co-Chief Executive Officer	Buy	23,527,044	$1.05	$24.70M3.2% OS	23,395,268
Aug 18, 2022	DUGGAN ROBERT W	Chief Executive Officer	Buy	94,849,203	$0.97	$92.00M12.7% OS	162,532,800+140%
Aug 18, 2022	Zanganeh Maky	Co-CEO & President	Buy	5,809,132	$0.97	$5.63M0.8% OS	7,061,557+464%
Aug 17, 2022	Dhingra Ankur	Chief Financial Officer	Buy	36,215	$0.97	$35.1K	38,196New Position
May 14, 2021	DUGGAN ROBERT W	Chief Executive Officer	Buy	11,365,921	$5.24	$59.56M1.5% OS	67,662,456
May 14, 2021	Zanganeh Maky	Chief Operating Officer	Buy	389,077	$5.24	$2.04M	2,643,319

SMMT Insider Buying Activity

The following table shows recent insider purchases of Summit Therapeutics Inc. (SMMT) stock reported via SEC Form 4 filings.

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Jun 12, 2026	DUGGAN ROBERT W	director, 10 percent owner, officer: Co-Chief Executive Officer	Buy	3,810,000	$13.12	$49.99M	573,883,904
Jun 12, 2026	Zanganeh Mahkam	director, 10 percent owner, officer: Co-Chief Executive Officer	Buy	3,810,000	$13.12	$49.99M	573,883,904
Jun 4, 2026	Soni Manmeet Singh	director, officer: COO and CFO	Buy	25,000	$14.43	$360.8K	3,123,603
Jun 4, 2026	Zanganeh Mahkam	director, 10 percent owner, officer: Co-Chief Executive Officer	Buy	100,000	$14.60	$1.46M	25,824,474
Jun 4, 2026	DUGGAN ROBERT W	director, 10 percent owner, officer: Co-Chief Executive Officer	Buy	100,000	$14.60	$1.46M	25,824,474
Oct 21, 2025	DUGGAN ROBERT W	Co-Chief Executive Officer	Buy	26,680	$18.74	$500.0K	0
Oct 21, 2025	Xia Yu	Director	Buy	533,617	$18.74	$10.00M	0
Sep 10, 2025	Zanganeh Mahkam	Co-Chief Executive Officer	Buy	338,394	$17.69	$5.98M	0
Mar 27, 2024	Dhingra Ankur	Chief Financial Officer	Buy	100,000	$3.75	$375.0K	354,958+39%
Mar 27, 2024	Zanganeh Mahkam	Chief Executive Officer	Buy	110,321	$3.73	$411.1K	24,923,800
Dec 13, 2023	Dhingra Ankur	Chief Financial Officer	Buy	20,400	$2.17	$44.3K	254,958
Dec 13, 2023	Zanganeh Mahkam	Chief Executive Officer	Buy	5,000	$2.07	$10.3K	494,814
Oct 16, 2023	Soni Manmeet Singh	Chief Operating Officer	Buy	2,976,190	$1.68	$5.00M	2,976,190
Mar 8, 2023	Dhingra Ankur	Chief Financial Officer	Buy	196,362	$1.05	$206.2K	234,558+514%
Mar 8, 2023	DUGGAN ROBERT W	Chief Executive Officer	Buy	376,489,880	$1.05	$395.31M50.6% OS	552,354,176+214%
Mar 8, 2023	Zanganeh Mahkam	Co-Chief Executive Officer	Buy	23,527,044	$1.05	$24.70M3.2% OS	23,395,268
Aug 18, 2022	DUGGAN ROBERT W	Chief Executive Officer	Buy	94,849,203	$0.97	$92.00M12.7% OS	162,532,800+140%
Aug 18, 2022	Zanganeh Maky	Co-CEO & President	Buy	5,809,132	$0.97	$5.63M0.8% OS	7,061,557+464%
Aug 17, 2022	Dhingra Ankur	Chief Financial Officer	Buy	36,215	$0.97	$35.1K	38,196New Position
May 14, 2021	DUGGAN ROBERT W	Chief Executive Officer	Buy	11,365,921	$5.24	$59.56M1.5% OS	67,662,456
May 14, 2021	Zanganeh Maky	Chief Operating Officer	Buy	389,077	$5.24	$2.04M	2,643,319