Summit Therapeutics Inc.

Last updated September 27, 2026

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Organization details

Legal name: Summit Therapeutics Inc.
Former names: Summit Corp plc
Ownership: Public
Status: Active
Sector (GICS): Health Care
SIC code: 2834 — Pharmaceutical Preparations
Headquarters city: Miami
Headquarters state / province: Florida
Headquarters country: United States
Fiscal year end: December
Ticker symbol: SMMT
Primary stock exchange: Nasdaq

Identifiers

SEC CIK: 0001599298
EIN: 37-1979717

Board of directors

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Alessandra Cesano · Director
Since 2023
Jeff Huber · Director
Since 2024
Kenneth A. Clark · Director
Since 2023
Mahkam Zanganeh · Director · Co-Chief Executive Officer
Since 2023
Manmeet Singh Soni · Director · COO and CFO
Since 2023
Mostafa Ronaghi · Director
Since 2024
Robert F. Booth · Director
Since 2023
Robert W. Duggan · Director · Co-Chief Executive Officer
Since 2023
Ujwala Mahatme · Director
Since 2023
Yu Xia · Director
Since 2023

Chief executives

Mahkam Zanganeh · Co-CEO & President

Dates unknown

Robert W. Duggan · Chief Executive Officer

Dates unknown

Director election results

Annual meeting of June 12, 2025. Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.

Board connections

6 of this board's directors also sit on 5 other boards. 3 are in the same sector.

Shared director Other board Same sector

Pulse Biosciences Inc Same sector
via Mahkam Zanganeh, Manmeet Singh Soni and Robert W. Duggan
Puma Biotechnology Inc Same sector
via Alessandra Cesano
Seer Inc.
via Mostafa Ronaghi
Upstart Holdings Inc.
via Jeff Huber
Zymeworks Inc. Same sector
via Alessandra Cesano

Insider trades

All notable trades →

From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.

Bought, last 12 months: $103,616,650; 6 purchases by 3 insiders
Sold, last 12 months: $0; 0 sales by 0 insiders

Date	Insider	Transaction	Shares	Price	Value
Jun 12, 2026	Mahkam Zanganeh Director, Officer (Co-Chief Executive Officer), 10% owner	Open-market purchase	+3,810,000	$13.12	$49,987,200
Jun 12, 2026	Robert W. Duggan Director, Officer (Co-Chief Executive Officer), 10% owner	Open-market purchase	+3,810,000	$13.12	$49,987,200
Jun 4, 2026	Robert W. Duggan Director, Officer (Co-Chief Executive Officer), 10% owner	Open-market purchase	+100,000	$14.60	$1,460,000
Jun 4, 2026	Mahkam Zanganeh Director, Officer (Co-Chief Executive Officer), 10% owner	Open-market purchase	+100,000	$14.60	$1,460,000
Jun 4, 2026	Manmeet Singh Soni Director, Officer (COO and CFO)	Open-market purchase	+25,000	$14.46	$361,500
Jun 4, 2026	Manmeet Singh Soni Director, Officer (COO and CFO)	Open-market purchase	+25,000	$14.43	$360,750
Oct 21, 2025	Yu Xia Director	Open-market purchase	+533,617	$18.74	$9,999,983
Oct 21, 2025	Anand Bhaskar Officer (Chief Accounting Officer)	Grant or award	+26,680	$18.74	$499,983
Oct 21, 2025	Manmeet Singh Soni Director, Officer (COO and CFO)	Grant or award	+53,361	$18.74	$999,985
Oct 21, 2025	Robert W. Duggan Director, Officer (Co-Chief Executive Officer), 10% owner	Grant or award	+13,980,789	$18.74	$261,999,986
Oct 21, 2025	Mahkam Zanganeh Director, Officer (Co-Chief Executive Officer), 10% owner	Grant or award	+266,808	$18.74	$4,999,982
Oct 21, 2025	Robert W. Duggan Director, Officer (Co-Chief Executive Officer), 10% owner	Grant or award	+266,808	$18.74	$4,999,982
Oct 21, 2025	Mahkam Zanganeh Director, Officer (Co-Chief Executive Officer), 10% owner	Open-market purchase	+26,680	$18.74	$499,983
Oct 21, 2025	Robert W. Duggan Director, Officer (Co-Chief Executive Officer), 10% owner	Open-market purchase	+26,680	$18.74	$499,983
Oct 21, 2025	Mahkam Zanganeh Director, Officer (Co-Chief Executive Officer), 10% owner	Grant or award	+13,980,789	$18.74	$261,999,986

Peers

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Questions about Summit Therapeutics Inc.

Who is the CEO of Summit Therapeutics Inc.?

Mahkam Zanganeh is Summit Therapeutics Inc.'s Co-CEO & President.

How many directors are on Summit Therapeutics Inc.'s board?

Summit Therapeutics Inc.'s board has 10 directors: Alessandra Cesano, Jeff Huber, Kenneth A. Clark, Mahkam Zanganeh, Manmeet Singh Soni, Mostafa Ronaghi, Robert F. Booth, Robert W. Duggan, Ujwala Mahatme and Yu Xia.

Are Summit Therapeutics Inc. insiders buying or selling shares?

Over the last 12 months, Summit Therapeutics Inc. insiders bought $103.6 million of shares in 6 purchases and made no open-market sales on the open market, as reported to the SEC on Forms 4 and 5.

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