Summit Therapeutics Inc.

SMMTNASDAQHealthcare● Active

$14.43

$-0.35(-2.34%)

Market Cap$11.2B

P/E Ratio—

52W High$30.98

52W Low$13.83

Avg Volume4.1M

Open$15.23

Beta-1.31

Insider Trades Ownership Employees

Summit Therapeutics Inc. (SMMT) Insider Trading

Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.

SEC EDGAR · FMP · SMMT · as of Jun 8, 2026

Activity summary

Buy transactions

P-Purchase only

Sell transactions

12 Months

Buy/Sell ratio

∞

Buy/Sell (by trades)

Overall sentiment

BULLISH

↑ Buy 100%Active transactions only · RSU vesting excluded0% Sell ↓

Summit Therapeutics Inc. insiders have been net buyers of shares over the past 12 Months, which may signal confidence in the company's outlook.

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only

As of Jun 8, 2026

SMMT insider buying and selling by quarter

SMMT insider selling · SMMT insider buying stocks · quarterly insider activity

Total insider buying (incl. awards)Total insider selling

50.0M25.0M0

2024 Q3

2024 Q4

2025 Q1

2025 Q2

2025 Q3

2025 Q4

2026 Q1

2026 Q2

Mobile shows last 4Q · Desktop shows full 8Q

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters

As of Jun 8, 2026

Active insiders

Most active in past 12 months · SMMT ceo insider trading

Showing all insiders · Click a card to filter the transactions table below

▸ Aggregated from reportingName · top 5 by trade count (12M) · no extra API

Recent insider transactions

SMMT executive sell shares · SMMT board member insider trading · SMMT insider trading SEC filing

Showing 33 most recent · Common Stock · Form 4 only

Scroll horizontally to see all columns

Date	Insider	Type	Shares	Price	Value	After trans.	Filing
Jun 4, 2026	DUGGAN ROBERT W Co-Chief Executive Officer · Director	Purchase	100,000	$14.60	$1.46M⚡	25,824,474	Form 4
Jun 4, 2026	Zanganeh Mahkam Co-Chief Executive Officer · Director	Purchase	100,000	$14.60	$1.46M⚡	25,824,474	Form 4
Jun 4, 2026	Soni Manmeet Singh COO and CFO · Director	Purchase	25,000	$14.43	$361K	3,123,603	Form 4
Jun 4, 2026	Soni Manmeet Singh COO and CFO · Director	Purchase	25,000	$14.46	$362K	3,098,603	Form 4
Oct 21, 2025	Xia Yu Director	Purchase	533,617	$18.74	$10.00M⚡	32,057,147	Form 4
Oct 21, 2025	Anand Bhaskar CAO	Award	26,680	$18.74	$500K	159,751	Form 4
Oct 21, 2025	Soni Manmeet Singh COO and CFO · Director	Award	53,361	$18.74	$1000K	3,073,603	Form 4
Oct 21, 2025	DUGGAN ROBERT W Co-Chief Executive Officer · Director	Award	13,980,789	$18.74	$262.00M⚡	570,073,879	Form 4
Oct 21, 2025	DUGGAN ROBERT W Co-Chief Executive Officer · Director	Award	266,808	$18.74	$5.00M⚡	25,724,474	Form 4
Oct 21, 2025	DUGGAN ROBERT W Co-Chief Executive Officer · Director	Purchase	26,680	$18.74	$500K	76,680	Form 4
Oct 21, 2025	Zanganeh Mahkam Co-Chief Executive Officer · Director	Award	13,980,789	$18.74	$262.00M⚡	570,073,879	Form 4
Oct 21, 2025	Zanganeh Mahkam Co-Chief Executive Officer · Director	Award	266,808	$18.74	$5.00M⚡	25,724,474	Form 4
Oct 21, 2025	Zanganeh Mahkam Co-Chief Executive Officer · Director	Purchase	26,680	$18.74	$500K	76,680	Form 4
Sep 11, 2025	Zanganeh Mahkam Co-Chief Executive Officer · Director	Purchase	5,000	$18.07	$90K	556,093,090	Form 4
Sep 10, 2025	Zanganeh Mahkam Co-Chief Executive Officer · Director	Purchase	333,394	$17.68	$5.89M⚡	556,088,090	Form 4
Sep 11, 2025	DUGGAN ROBERT W Co-Chief Executive Officer · Director	Purchase	5,000	$18.07	$90K	556,093,090	Form 4
Sep 10, 2025	DUGGAN ROBERT W Co-Chief Executive Officer · Director	Purchase	333,394	$17.68	$5.89M⚡	556,088,090	Form 4
May 30, 2025	Zanganeh Mahkam Co-Chief Executive Officer · Director	Option	74,545	$2.64	$197K	555,754,696	Form 4
May 30, 2025	DUGGAN ROBERT W Co-Chief Executive Officer · Director	Option	74,545	$2.64	$197K	555,754,696	Form 4
Apr 8, 2025	Zanganeh Mahkam Co-Chief Executive Officer · Director	Other	3,985,055	$1.58	$6.30M⚡	555,680,151	Form 4
Apr 8, 2025	DUGGAN ROBERT W Co-Chief Executive Officer · Director	Other	3,985,055	$1.58	$6.30M⚡	555,680,151	Form 4
Oct 3, 2024	Zanganeh Mahkam Co-Chief Executive Officer · Director	Other	315,681	$1.58	$499K	10,199,776	Form 4
Sep 11, 2024	Zanganeh Mahkam Co-Chief Executive Officer · Director	Award	44,052	$22.70	$1000K	24,967,852	Form 4
Sep 11, 2024	DUGGAN ROBERT W Co-Chief Executive Officer · Director	Award	3,325,991	$22.70	$75.50M⚡	551,695,096	Form 4
Sep 11, 2024	Huber Jeff Director	Award	44,052	$22.70	$1000K	44,052	Form 4

DUGGAN ROBERT W

Co-Chief Executive Officer · Director

Purchase

Date

Jun 4

100,000

Price

$14.60

Value

$1.46M ⚡

View Form 4 on SEC.gov

Zanganeh Mahkam

Co-Chief Executive Officer · Director

Purchase

Date

Jun 4

100,000

Price

$14.60

Value

$1.46M ⚡

View Form 4 on SEC.gov

Soni Manmeet Singh

COO and CFO · Director

Purchase

Date

Jun 4

25,000

Price

$14.43

Value

$361K

View Form 4 on SEC.gov

Soni Manmeet Singh

COO and CFO · Director

Purchase

Date

Jun 4

25,000

Price

$14.46

Value

$362K

View Form 4 on SEC.gov

Xia Yu

Director

Purchase

Date

Oct 21

533,617

Price

$18.74

Value

$10.00M ⚡

View Form 4 on SEC.gov

Anand Bhaskar

CAO

Award

Date

Oct 21

26,680

Price

$18.74

Value

$500K

View Form 4 on SEC.gov

Soni Manmeet Singh

COO and CFO · Director

Award

Date

Oct 21

53,361

Price

$18.74

Value

$1000K

View Form 4 on SEC.gov

DUGGAN ROBERT W

Co-Chief Executive Officer · Director

Award

Date

Oct 21

13,980,789

Price

$18.74

Value

$262.00M ⚡

View Form 4 on SEC.gov

DUGGAN ROBERT W

Co-Chief Executive Officer · Director

Award

Date

Oct 21

266,808

Price

$18.74

Value

$5.00M ⚡

View Form 4 on SEC.gov

DUGGAN ROBERT W

Co-Chief Executive Officer · Director

Purchase

Date

Oct 21

26,680

Price

$18.74

Value

$500K

View Form 4 on SEC.gov

Zanganeh Mahkam

Co-Chief Executive Officer · Director

Award

Date

Oct 21

13,980,789

Price

$18.74

Value

$262.00M ⚡

View Form 4 on SEC.gov

Zanganeh Mahkam

Co-Chief Executive Officer · Director

Award

Date

Oct 21

266,808

Price

$18.74

Value

$5.00M ⚡

View Form 4 on SEC.gov

Zanganeh Mahkam

Co-Chief Executive Officer · Director

Purchase

Date

Oct 21

26,680

Price

$18.74

Value

$500K

View Form 4 on SEC.gov

Zanganeh Mahkam

Co-Chief Executive Officer · Director

Purchase

Date

Sep 11

5,000

Price

$18.07

Value

$90K

View Form 4 on SEC.gov

Zanganeh Mahkam

Co-Chief Executive Officer · Director

Purchase

Date

Sep 10

333,394

Price

$17.68

Value

$5.89M ⚡

View Form 4 on SEC.gov

DUGGAN ROBERT W

Co-Chief Executive Officer · Director

Purchase

Date

Sep 11

5,000

Price

$18.07

Value

$90K

View Form 4 on SEC.gov

DUGGAN ROBERT W

Co-Chief Executive Officer · Director

Purchase

Date

Sep 10

333,394

Price

$17.68

Value

$5.89M ⚡

View Form 4 on SEC.gov

Zanganeh Mahkam

Co-Chief Executive Officer · Director

Option

Date

May 30

74,545

Price

$2.64

Value

$197K

View Form 4 on SEC.gov

DUGGAN ROBERT W

Co-Chief Executive Officer · Director

Option

Date

May 30

74,545

Price

$2.64

Value

$197K

View Form 4 on SEC.gov

Zanganeh Mahkam

Co-Chief Executive Officer · Director

Other

Date

Apr 8

3,985,055

Price

$1.58

Value

$6.30M ⚡

View Form 4 on SEC.gov

DUGGAN ROBERT W

Co-Chief Executive Officer · Director

Other

Date

Apr 8

3,985,055

Price

$1.58

Value

$6.30M ⚡

View Form 4 on SEC.gov

Zanganeh Mahkam

Co-Chief Executive Officer · Director

Other

Date

Oct 3

315,681

Price

$1.58

Value

$499K

View Form 4 on SEC.gov

Zanganeh Mahkam

Co-Chief Executive Officer · Director

Award

Date

Sep 11

44,052

Price

$22.70

Value

$1000K

View Form 4 on SEC.gov

DUGGAN ROBERT W

Co-Chief Executive Officer · Director

Award

Date

Sep 11

3,325,991

Price

$22.70

Value

$75.50M ⚡

View Form 4 on SEC.gov

Huber Jeff

Director

Award

Date

Sep 11

44,052

Price

$22.70

Value

$1000K

View Form 4 on SEC.gov

⚡ = value ≥ $1M · Award/Option price shows — · formType=4 · securityName=Common Stock · url → sec.gov/Archives/edgar

1 / 2

▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —

About SMMT insider trading

SMMT insider trades

Summit Therapeutics Inc. (SMMT) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including DUGGAN ROBERT W (Co-Chief Executive Officer · Director), Zanganeh Mahkam (Co-Chief Executive Officer · Director), Soni Manmeet Singh (COO and CFO · Director). Over the past 12 months, 5 insiders have filed transactions with the SEC. SMMT insiders have been primarily buying, which may reflect pre-scheduled Rule 10b5-1 plan executions.

For Summit Therapeutics Inc.'s institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →

Buy/Sell signal logic

acquisitionOrDisposition field:

A = Acquisition (buy) · D = Disposition (sell)

RSU vesting (M-Exempt) excluded from sentiment

Form 4SEC filing required within 2 business days of any insider transaction

10b5-1Pre-scheduled trading plan that allows insiders to sell on autopilot

Open MktDirect purchase or sale on the open market (excludes awards, options)

Ownership SEC filings Financial statements Price history Forecast & ratings Earnings

Frequently asked questions

SMMT insider trading · 5 questions

The insiders of Summit Therapeutics Inc. (SMMT) include executives and directors such as DUGGAN ROBERT W (Co-Chief Executive Officer · Director), Zanganeh Mahkam (Co-Chief Executive Officer · Director), Soni Manmeet Singh (COO and CFO · Director), among others. Over the past 12 months, 5 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.

SMMT board member insider tradingwho are SMMT insidersSMMT insider rosterSummit Therapeutics Inc. executives insider activity

▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 8, 2026