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Summit Therapeutics Inc. (SMMT) institutional ownership

Latest close $14.98 Jul 23, 2026
Market cap$20.1B 52-week range SectorHealthcare
Funds holding · Q1 2026
224
reported SMMT position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Activity unavailable N/A
136 buyers · 88 sellers

Summit Therapeutics Inc. (SMMT) price and institutional activity

Dates

Q1 2026

$0 bought by 136 investors
UBS Group AGD. E. Shaw & Co., Inc. +134 more
$0 sold by 88 investors
FMR LLCCitadel Advisors LLC +86 more
Bought Sold Totals per quarter; hover a bar for the names.

Summit Therapeutics Inc. (SMMT) institutional activity · 224

Investor Type Est. change Change Δ Own Date
UBS Group AG · Added
Change +2.8M Date Q1 2026
UBS Group AG Added· Q1 2026 +2.8M Q1 2026
FMR LLC · Reduced
Change −2.5M Δ Own −18.8% Date Q1 2026
FMR LLC Reduced· Q1 2026 −2.5M −18.8% Q1 2026
Citadel Advisors LLC Reduced· Q1 2026 −2.0M −82.2% Q1 2026
D. E. Shaw & Co., Inc. · Added
Change +1.8M Δ Own +439.9% Date Q1 2026
D. E. Shaw & Co., Inc. Added· Q1 2026 +1.8M +439.9% Q1 2026
Norges · Exited
Change −1.4M Δ Own −100.0% Date Q1 2026
Norges Exited· Q1 2026 −1.4M −100.0% Q1 2026
Polymer Capital Management (hk) Ltd · Reduced
Change −1.3M Date Q1 2026
Polymer Capital Management (hk) Ltd Reduced· Q1 2026 −1.3M Q1 2026
T. Rowe Price Associates · Reduced
Change −1.1M Date Q1 2026
T. Rowe Price Associates Reduced· Q1 2026 −1.1M Q1 2026
Superstring Capital Management LP · New
Change +893K Date Q1 2026
Superstring Capital Management LP New· Q1 2026 +893K Q1 2026
Vanguard · Added
Change +792K Date Q1 2026
Vanguard Added· Q1 2026 +792K Q1 2026
Point72 Asset Management, L.P. · New
Change +784K Date Q1 2026
Point72 Asset Management, L.P. New· Q1 2026 +784K Q1 2026
Morgan Stanley · Added
Change +724K Date Q1 2026
Morgan Stanley Added· Q1 2026 +724K Q1 2026
Susquehanna International Group, LLP · New
Change +604K Date Q1 2026
Susquehanna International Group, LLP New· Q1 2026 +604K Q1 2026
Balyasny Asset Management L.P. · Added
Change +498K Date Q1 2026
Balyasny Asset Management L.P. Added· Q1 2026 +498K Q1 2026
Marshall Wace, LLP · New
Change +475K Date Q1 2026
Marshall Wace, LLP New· Q1 2026 +475K Q1 2026
Two Sigma Investments, LP · Added
Change +403K Δ Own +69.7% Date Q1 2026
Two Sigma Investments, LP Added· Q1 2026 +403K +69.7% Q1 2026
Data through Q1 2026 · filed Jun 2, 2026
15 of 224

Famous investor activity in Summit Therapeutics Inc. (SMMT)

Summit Therapeutics Inc. (SMMT) insider trading

Company insiders, action and economics first; trade and filed dates last.
Dates
Insider Title Type Price Qty Value Owned ΔOwn Trade date Filed date
Zanganeh Mahkam · Director Buy +$50M
Price $13.12 Qty +3.8M Owned 573.9M Trade date Jun 12, 2026 Filed date Jun 12, 2026
Zanganeh Mahkam Director Buy $13.12 +3.8M +$50M 573.9M Jun 12, 2026 Jun 12, 2026
Duggan Robert W. · Director Buy +$50M
Price $13.12 Qty +3.8M Owned 573.9M Trade date Jun 12, 2026 Filed date Jun 12, 2026
Duggan Robert W. Director Buy $13.12 +3.8M +$50M 573.9M Jun 12, 2026 Jun 12, 2026
Duggan Robert W. · Director Buy +$1.5M
Price $14.60 Qty +100K Owned 25.8M Trade date Jun 4, 2026 Filed date Jun 4, 2026
Duggan Robert W. Director Buy $14.60 +100K +$1.5M 25.8M Jun 4, 2026 Jun 4, 2026
Zanganeh Mahkam · Director Buy +$1.5M
Price $14.60 Qty +100K Owned 25.8M Trade date Jun 4, 2026 Filed date Jun 4, 2026
Zanganeh Mahkam Director Buy $14.60 +100K +$1.5M 25.8M Jun 4, 2026 Jun 4, 2026
Soni Manmeet Singh · Director 2 operations +$722K
Price $14.43–$14.46 Qty +50K Owned 3.1M Trade date Jun 4, 2026 Filed date Jun 4, 2026
Soni Manmeet Singh Director 2 operations $14.43–$14.46 +50K +$722K 3.1M Jun 4, 2026 Jun 4, 2026
Anand Bhaskar · Officer Grant (A) 30K
Owned 30K Trade date Jan 8, 2026 Filed date Jan 12, 2026
Anand Bhaskar Officer Grant (A) 30K 30K Jan 8, 2026 Jan 12, 2026
Zanganeh Mahkam · Director, Officer, 10% Owner Grant (A) $98K
Price $8.76 Qty 11K Owned 11K Trade date Jan 2, 2026 Filed date Jan 6, 2026
Zanganeh Mahkam Director, Officer, 10% Owner Grant (A) $8.76 11K $98K 11K Jan 2, 2026 Jan 6, 2026
Duggan Robert W. · Director, Officer, 10% Owner Grant (A) $98K
Price $8.76 Qty 11K Owned 11K Trade date Jan 2, 2026 Filed date Jan 6, 2026
Duggan Robert W. Director, Officer, 10% Owner Grant (A) $8.76 11K $98K 11K Jan 2, 2026 Jan 6, 2026
Booth Robert F. · Director 2 operations 42K
Price $8.76 Owned 7K Trade date Jan 2, 2026 Filed date Jan 6, 2026
Booth Robert F. Director 2 operations $8.76 42K 7K Jan 2, 2026 Jan 6, 2026
Xia Yu · Director Grant (A) 35K
Owned 35K Trade date Jan 2, 2026 Filed date Jan 6, 2026
Xia Yu Director Grant (A) 35K 35K Jan 2, 2026 Jan 6, 2026
Huber Jeff · Director 2 operations 45K
Price $8.76 Owned 35K Trade date Jan 2, 2026 Filed date Jan 6, 2026
Huber Jeff Director 2 operations $8.76 45K 35K Jan 2, 2026 Jan 6, 2026
Ronaghi Mostafa · Director Grant (A) 35K
Owned 35K Trade date Jan 2, 2026 Filed date Jan 6, 2026
Ronaghi Mostafa Director Grant (A) 35K 35K Jan 2, 2026 Jan 6, 2026
Clark Kenneth A. · Director 2 operations 53K
Price $8.76 Owned 18K Trade date Jan 2, 2026 Filed date Jan 6, 2026
Clark Kenneth A. Director 2 operations $8.76 53K 18K Jan 2, 2026 Jan 6, 2026
Cesano Alessandra · Director 2 operations 38K
Price $8.76 Owned 3K Trade date Jan 2, 2026 Filed date Jan 6, 2026
Cesano Alessandra Director 2 operations $8.76 38K 3K Jan 2, 2026 Jan 6, 2026
Xia Yu · Director Buy +$10.0M
Price $18.74 Qty +534K Owned 32.1M Trade date Oct 21, 2025 Filed date Oct 23, 2025
Xia Yu Director Buy $18.74 +534K +$10.0M 32.1M Oct 21, 2025 Oct 23, 2025
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15 of 26 Sign in to continue to older insider transactions.

Summit Therapeutics Inc. (SMMT) activist and large shareholders

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
Duggan Robert W 555.7M
% of shares outstanding 75.2% Filing date Sep 13, 2024
Duggan Robert W 555.7M 75.2% Sep 13, 2024
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Summit Therapeutics Inc. (SMMT) ownership FAQ

Who owns SMMT?

224 reporting institutions disclosed SMMT position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.