SMMT

Summit Therapeutics Inc.

Insider trading activity for Summit Therapeutics Inc., straight from SEC Form 4 filings. Net figures below count open-market buys and sales only — grants, option exercises and tax withholding are excluded because they are compensation, not decisions to trade.

Past 3 months

net buying

Bought(0 · 0 insiders): $0
Sold(0 · 0 insiders): $0

Past 6 months

+$103.6M

net buying

Bought(6 · 3 insiders): $103.6M
Sold(0 · 0 insiders): $0

Past 12 months

+$103.6M

net buying

Bought(6 · 3 insiders): $103.6M
Sold(0 · 0 insiders): $0

Transaction history

The 47 most recent Form 4 transactions.

Open in screener →

Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Insider	Role	Type	Shares	Price	Value	Δ Own	Filing
Oct 8	Anand Bhaskar	Chief Accounting Officer	AGRANT	100,000	—	—	+62.1%	Open the original filing on SEC.gov
Jun 12	Zanganeh Mahkam	Co-Chief Executive…	PBUY▲	3.8M	$13.12	$50M	+0.7%	Open the original filing on SEC.gov
Jun 12	Duggan Robert W	Co-Chief Executive…	PBUY▲	3.8M	$13.12	$50M	+0.7%	Open the original filing on SEC.gov
Jun 4	Zanganeh Mahkam	Co-Chief Executive…	PBUY↓	100,000	$14.60	$1.5M	+0.4%	Open the original filing on SEC.gov
Jun 4	Soni Manmeet Singh	COO and CFO	PBUY	25,000	$14.43	$360.8K	+0.8%	Open the original filing on SEC.gov
Jun 4	Soni Manmeet Singh	COO and CFO	PBUY★	25,000	$14.46	$361.5K	+0.8%	Open the original filing on SEC.gov
Jun 4	Duggan Robert W	Co-Chief Executive…	PBUY↓	100,000	$14.60	$1.5M	+0.4%	Open the original filing on SEC.gov
Jan 8	Anand Bhaskar	Chief Accounting Officer	AGRANT◆	30,000	—	—	—	Open the original filing on SEC.gov
Jan 2	Xia Yu	Director	AGRANT◆	35,000	—	—	—	Open the original filing on SEC.gov
Jan 2	Zanganeh Mahkam	Co-Chief Executive…	AGRANT◆	11,232	$8.76	$98.4K	—	Open the original filing on SEC.gov
Jan 2	Ronaghi Mostafa	Director	AGRANT◆	35,000	—	—	—	Open the original filing on SEC.gov
Jan 2	Huber Jeff	Director	AGRANT◆	9,885	$8.76	$86.6K	—	Open the original filing on SEC.gov
Jan 2	Huber Jeff	Director	AGRANT◆	35,000	—	—	—	Open the original filing on SEC.gov
Jan 2	Duggan Robert W	Co-Chief Executive…	AGRANT◆	11,232	$8.76	$98.4K	—	Open the original filing on SEC.gov
Jan 2	Clark Kenneth A	Director	AGRANT◆	17,796	$8.76	$155.9K	—	Open the original filing on SEC.gov
Jan 2	Clark Kenneth A	Director	AGRANT◆	35,000	—	—	—	Open the original filing on SEC.gov
Jan 2	Cesano Alessandra	Director	AGRANT◆	3,219	$8.76	$28.2K	—	Open the original filing on SEC.gov
Jan 2	Cesano Alessandra	Director	AGRANT◆	35,000	—	—	—	Open the original filing on SEC.gov
Jan 2	Booth Robert F.	Director	AGRANT◆	7,180	$8.76	$62.9K	—	Open the original filing on SEC.gov
Jan 2	Booth Robert F.	Director	AGRANT◆	35,000	—	—	—	Open the original filing on SEC.gov
Oct 21, 2025	Xia Yu	Director	PBUY	533,617	$18.74	$10M	+1.7%	Open the original filing on SEC.gov
Oct 21, 2025	Zanganeh Mahkam	Co-Chief Executive…	AGRANT	14M	$18.74	$262M	+2.5%	Open the original filing on SEC.gov
Oct 21, 2025	Zanganeh Mahkam	Co-Chief Executive…	PBUY	26,680	$18.74	$500K	+53.4%	Open the original filing on SEC.gov
Oct 21, 2025	Zanganeh Mahkam	Co-Chief Executive…	AGRANT	266,808	$18.74	$5M	+1.1%	Open the original filing on SEC.gov
Oct 21, 2025	Soni Manmeet Singh	COO and CFO	AGRANT	53,361	$18.74	$1M	+1.8%	Open the original filing on SEC.gov
Oct 21, 2025	Duggan Robert W	Co-Chief Executive…	PBUY	26,680	$18.74	$500K	+53.4%	Open the original filing on SEC.gov
Oct 21, 2025	Duggan Robert W	Co-Chief Executive…	AGRANT	266,808	$18.74	$5M	+1.1%	Open the original filing on SEC.gov
Oct 21, 2025	Duggan Robert W	Co-Chief Executive…	AGRANT	14M	$18.74	$262M	+2.5%	Open the original filing on SEC.gov
Oct 21, 2025	Anand Bhaskar	Chief Accounting Officer	AGRANT	26,680	$18.74	$500K	+20.1%	Open the original filing on SEC.gov
Sep 18, 2025	Anand Bhaskar	Chief Accounting Officer	AGRANT◆	50,000	—	—	—	Open the original filing on SEC.gov
Sep 11, 2025	Zanganeh Mahkam	Co-Chief Executive…	PBUY	5,000	$18.07	$90.4K	0.0%	Open the original filing on SEC.gov
Sep 11, 2025	Duggan Robert W	Co-Chief Executive…	PBUY	5,000	$18.07	$90.4K	0.0%	Open the original filing on SEC.gov
Sep 10, 2025	Zanganeh Mahkam	Co-Chief Executive…	PBUY	333,394	$17.68	$5.9M	+<0.1%	Open the original filing on SEC.gov
Sep 10, 2025	Duggan Robert W	Co-Chief Executive…	PBUY	333,394	$17.68	$5.9M	+<0.1%	Open the original filing on SEC.gov
May 30, 2025	Zanganeh Mahkam	Co-Chief Executive…	MEXER◆	74,545	—	—	—	Open the original filing on SEC.gov
May 30, 2025	Zanganeh Mahkam	Co-Chief Executive…	MEXER	74,545	$2.64	$196.8K	+<0.1%	Open the original filing on SEC.gov
May 30, 2025	Duggan Robert W	Co-Chief Executive…	MEXER◆	74,545	—	—	—	Open the original filing on SEC.gov
May 30, 2025	Duggan Robert W	Co-Chief Executive…	MEXER	74,545	$2.64	$196.8K	+<0.1%	Open the original filing on SEC.gov
Apr 29, 2025	Zanganeh Mahkam	Co-Chief Executive…	AGRANT◆	9.6M	—	—	—	Open the original filing on SEC.gov
Apr 29, 2025	Zanganeh Mahkam	Co-Chief Executive…	AGRANT◆	400,000	—	—	—	Open the original filing on SEC.gov
Apr 29, 2025	Zanganeh Mahkam	Co-Chief Executive…	AGRANT◆	1M	—	—	—	Open the original filing on SEC.gov
Apr 29, 2025	Soni Manmeet Singh	COO and CFO	AGRANT◆	11.2M	—	—	—	Open the original filing on SEC.gov
Apr 29, 2025	Duggan Robert W	Co-Chief Executive…	AGRANT◆	9.6M	—	—	—	Open the original filing on SEC.gov
Apr 29, 2025	Duggan Robert W	Co-Chief Executive…	AGRANT◆	400,000	—	—	—	Open the original filing on SEC.gov
Apr 29, 2025	Duggan Robert W	Co-Chief Executive…	AGRANT◆	1M	—	—	—	Open the original filing on SEC.gov
Apr 29, 2025	Anand Bhaskar	Chief Accounting Officer	AGRANT◆	75,000	—	—	—	Open the original filing on SEC.gov
Apr 29, 2025	Anand Bhaskar	Chief Accounting Officer	AGRANT◆	600,000	—	—	—	Open the original filing on SEC.gov

AGRANT—

Anand Bhaskar · Chief Accounting…Oct 8

100,000 sh · +62.1% own

PBUY▲$50M

Zanganeh Mahkam · Co-Chief Executive…Jun 12

3.8M sh @ $13.12 · +0.7% own

PBUY▲$50M

Duggan Robert W · Co-Chief Executive…Jun 12

3.8M sh @ $13.12 · +0.7% own

PBUY↓$1.5M

Zanganeh Mahkam · Co-Chief Executive…Jun 4

100,000 sh @ $14.60 · +0.4% own

PBUY$360.8K

Soni Manmeet Singh · COO and CFOJun 4

25,000 sh @ $14.43 · +0.8% own

PBUY★$361.5K

Soni Manmeet Singh · COO and CFOJun 4

25,000 sh @ $14.46 · +0.8% own

PBUY↓$1.5M

Duggan Robert W · Co-Chief Executive…Jun 4

100,000 sh @ $14.60 · +0.4% own

AGRANT◆—

Anand Bhaskar · Chief Accounting…Jan 8

30,000 sh

AGRANT◆—

Xia Yu · DirectorJan 2

35,000 sh

AGRANT◆$98.4K

Zanganeh Mahkam · Co-Chief Executive…Jan 2

11,232 sh @ $8.76

AGRANT◆—

Ronaghi Mostafa · DirectorJan 2

35,000 sh

AGRANT◆$86.6K

Huber Jeff · DirectorJan 2

9,885 sh @ $8.76

AGRANT◆—

Huber Jeff · DirectorJan 2

35,000 sh

AGRANT◆$98.4K

Duggan Robert W · Co-Chief Executive…Jan 2

11,232 sh @ $8.76

AGRANT◆$155.9K

Clark Kenneth A · DirectorJan 2

17,796 sh @ $8.76

AGRANT◆—

Clark Kenneth A · DirectorJan 2

35,000 sh

AGRANT◆$28.2K

Cesano Alessandra · DirectorJan 2

3,219 sh @ $8.76

AGRANT◆—

Cesano Alessandra · DirectorJan 2

35,000 sh

AGRANT◆$62.9K

Booth Robert F. · DirectorJan 2

7,180 sh @ $8.76

AGRANT◆—

Booth Robert F. · DirectorJan 2

35,000 sh

PBUY$10M

Xia Yu · DirectorOct 21, 2025

533,617 sh @ $18.74 · +1.7% own

AGRANT$262M

Zanganeh Mahkam · Co-Chief Executive…Oct 21, 2025

14M sh @ $18.74 · +2.5% own

PBUY$500K

Zanganeh Mahkam · Co-Chief Executive…Oct 21, 2025

26,680 sh @ $18.74 · +53.4% own

AGRANT$5M

Zanganeh Mahkam · Co-Chief Executive…Oct 21, 2025

266,808 sh @ $18.74 · +1.1% own

AGRANT$1M

Soni Manmeet Singh · COO and CFOOct 21, 2025

53,361 sh @ $18.74 · +1.8% own

PBUY$500K

Duggan Robert W · Co-Chief Executive…Oct 21, 2025

26,680 sh @ $18.74 · +53.4% own

AGRANT$5M

Duggan Robert W · Co-Chief Executive…Oct 21, 2025

266,808 sh @ $18.74 · +1.1% own

AGRANT$262M

Duggan Robert W · Co-Chief Executive…Oct 21, 2025

14M sh @ $18.74 · +2.5% own

AGRANT$500K

Anand Bhaskar · Chief Accounting…Oct 21, 2025

26,680 sh @ $18.74 · +20.1% own

AGRANT◆—

Anand Bhaskar · Chief Accounting…Sep 18, 2025

50,000 sh

PBUY$90.4K

Zanganeh Mahkam · Co-Chief Executive…Sep 11, 2025

5,000 sh @ $18.07 · 0.0% own

PBUY$90.4K

Duggan Robert W · Co-Chief Executive…Sep 11, 2025

5,000 sh @ $18.07 · 0.0% own

PBUY$5.9M

Zanganeh Mahkam · Co-Chief Executive…Sep 10, 2025

333,394 sh @ $17.68 · +<0.1% own

PBUY$5.9M

Duggan Robert W · Co-Chief Executive…Sep 10, 2025

333,394 sh @ $17.68 · +<0.1% own

MEXER◆—

Zanganeh Mahkam · Co-Chief Executive…May 30, 2025

74,545 sh

MEXER$196.8K

Zanganeh Mahkam · Co-Chief Executive…May 30, 2025

74,545 sh @ $2.64 · +<0.1% own

MEXER◆—

Duggan Robert W · Co-Chief Executive…May 30, 2025

74,545 sh

MEXER$196.8K

Duggan Robert W · Co-Chief Executive…May 30, 2025

74,545 sh @ $2.64 · +<0.1% own

AGRANT◆—

Zanganeh Mahkam · Co-Chief Executive…Apr 29, 2025

9.6M sh

AGRANT◆—

Zanganeh Mahkam · Co-Chief Executive…Apr 29, 2025

400,000 sh

AGRANT◆—

Zanganeh Mahkam · Co-Chief Executive…Apr 29, 2025

1M sh

AGRANT◆—

Soni Manmeet Singh · COO and CFOApr 29, 2025

11.2M sh

AGRANT◆—

Duggan Robert W · Co-Chief Executive…Apr 29, 2025

9.6M sh

AGRANT◆—

Duggan Robert W · Co-Chief Executive…Apr 29, 2025

400,000 sh

AGRANT◆—

Duggan Robert W · Co-Chief Executive…Apr 29, 2025

1M sh

AGRANT◆—

Anand Bhaskar · Chief Accounting…Apr 29, 2025

75,000 sh

AGRANT◆—

Anand Bhaskar · Chief Accounting…Apr 29, 2025

600,000 sh

Filing record

How quickly insiders here report their trades. Section 16 allows two business days from the transaction.

1 of 24 filings we hold was filed after the two-business-day deadline. The furthest past the deadline was 1 business day late.

Form 4 filings made after the two-business-day deadline, with the transaction date, the filing date and the number of business days between them.
Traded	Filed	Insider	Past deadline	Largest line	Source
Oct 8	Oct 14	Anand BhaskarChief Accounting Officer	1day	—	Filing ↗

Anand BhaskarChief Accounting Officer

1day

Traded Oct 8 · filed Oct 14Filing ↗

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays. How this is measured · All late filings

Insiders at this company

Everyone who has filed a Form 4 for this issuer.

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