$SMMT

$15.33 +$0.83 (5.72%) Close

$SMMT Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 797.7M shares outstanding

Who owns SMMT?

By type of holder

Institutions 26.5% Insiders 73.5% Everyone else 0.0%

Concentration Top 10 holders own 173.8%

Zanganeh Maky 80.8% · Duggan Robert W 76.5%

Institutional ownership

26.5%

+2.7 pts vs last qtr

Institutional holders

327

+16 vs last qtr

Net shares bought

+21.6M

by institutions in Q2 2026

New / sold out

63 / 47

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Goldman Sachs Group Inc +3.9M
State Street Corp +3.1M

Biggest sellers in Q2 2026

Price T Rowe Associates Inc /MD/ −3.7M
Baker Bros. Advisors LP −3.6M

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Summit Therapeutics Inc. in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2023–FY2025

+20.7%

+9.85% a year

Each share's claim on the business

−17.1%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $798M

over 3 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years49% 3–5 years20% 1–3 years16% Under 1 year15%

Quarterly turnover

15.6%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting SMMT on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
BB Baker Bros. Advisors LP	36.1M	4.53%	−3.6M (−9.1%)	2022	2.9%
Shares held by quarter Peak holding39.7M (Q4'25) Change over 8 quarters+7.3M Share of the company4.530% Baker Bros. Advisors LP's full portfolio →
F FMR LLC	15.4M	1.93%	−879.8K (−5.4%)	≤2021	0.0%
Shares held by quarter Peak holding19.0M (Q4'25) Change over 8 quarters+6.7M Share of the company1.930% FMR LLC's full portfolio →

Baker Bros. Advisors LP

36.1M

% of company

4.53%

Change vs last qtr

−3.6M (−9.1%)

Held since

2022

FMR LLC

15.4M

% of company

1.93%

Change vs last qtr

−879.8K (−5.4%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Summit Therapeutics Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting SMMT on Form N-PORT; together they hold 7.5% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
SS State Street(R) SPDR(R) S&P(R) Biotech ETF SPDR Series Trust	$160M	9.0M	1.13%	1.49%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$116M	5.6M	0.70%	0.01%	June 30, 2026

State Street(R) SPDR(R) S&P(R) Biotech ETF

SPDR Series Trust

Position value

$160M

% of company

1.13%

% of the fund

1.49%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$116M

% of company

0.70%

% of the fund

0.01%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Summit Therapeutics Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
ZM Zanganeh Maky Insider	644.5M	80.79%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company80.790% Zanganeh Maky's insider activity →
DR Duggan Robert W Insider	610.0M	76.47%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company76.470% Duggan Robert W's insider activity →

Zanganeh Maky

Insider

644.5M

% of company

80.79%

Change vs last qtr

—

Held since

—

Duggan Robert W

Insider

610.0M

% of company

76.47%

Change vs last qtr

—

Held since

—

3 more holders behind a free account

See every insider and 5%+ holder of Summit Therapeutics Inc..

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