InsiderClue
← All stocks

Summit Therapeutics Inc.

SMMT Net buying
CIK 0001599298 #943 in the set updated 17 Sep 2026
Bought (120 mo)
$758.92M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$321.46K
$0.00 on a plan · $321.46K straight out of an exercise
Sold at will
$0.00
0 of 5 sales
Net
+$758.60M
+$758.92M against sales at will

By person

8 insiders · 48 transactions
Insider
Role
Bought
Sold
Net
Holding
Of company
Worth
Change
DUGGAN ROBERT W
Co-Chief Executive Officer
$651.81M (9)
—
+$651.81M
599,708,353
75.18%
$7.87B
+786.4%
Zanganeh Mahkam
Co-Chief Executive Officer
$90.73M (17)
—
+$90.73M
574,404,693
72.00%
$7.54B
+10.4%
Xia Yu
Director
$10.00M (1)
—
+$10.00M
32,057,147
4.02%
$420.59M
+1.7%
Soni Manmeet Singh
COO and CFO
$5.72M (3)
—
+$5.72M
3,123,603
0.3916%
$40.98M
—
Dhingra Ankur
Chief Financial Officer
$660.56K (6)
—
+$660.56K
393,015
0.0493%
$5.16M
+881.6%
Powell David Jonathan
Chief Scientific Officer
—
$321.46K (5) scheduled
−$321.46K
0
0.0000%
$0.00
—
Anand Bhaskar
Chief Accounting Officer
—
—
—
159,751
0.0200%
$2.10M
+43.9%
Huber Jeff
Director
—
—
—
44,052
0.0055%
$577.96K
—

Individual transactions

48
Insider
Date
Role
Action
Shares
Price
Amount
DUGGAN ROBERT W
12 Jun 2026
Co-Chief Executive Officer
Buy
3,810,000
$13.12
$49.99M
Zanganeh Mahkam
12 Jun 2026
Co-Chief Executive Officer
Buy indirect
3,810,000
$13.12
$49.99M
Soni Manmeet Singh
4 Jun 2026
COO and CFO
Buy
25,000
$14.43
$360.75K
Soni Manmeet Singh
4 Jun 2026
COO and CFO
Buy
25,000
$14.46
$361.50K
Zanganeh Mahkam
4 Jun 2026
Co-Chief Executive Officer
Buy indirect
100,000
$14.60
$1.46M
DUGGAN ROBERT W
4 Jun 2026
Co-Chief Executive Officer
Buy indirect
100,000
$14.60
$1.46M
Zanganeh Mahkam
21 Oct 2025
Co-Chief Executive Officer
Buy indirect
26,680
$18.74
$499.98K
DUGGAN ROBERT W
21 Oct 2025
Co-Chief Executive Officer
Buy indirect
26,680
$18.74
$499.98K
Xia Yu
21 Oct 2025
Director
Buy indirect
533,617
$18.74
$10.00M
DUGGAN ROBERT W
11 Sep 2025
Co-Chief Executive Officer
Buy
5,000
$18.07
$90.35K
Zanganeh Mahkam
11 Sep 2025
Co-Chief Executive Officer
Buy indirect
5,000
$18.07
$90.35K
DUGGAN ROBERT W
10 Sep 2025
Co-Chief Executive Officer
Buy
333,394
$17.68
$5.89M
Zanganeh Mahkam
10 Sep 2025
Co-Chief Executive Officer
Buy indirect
333,394
$17.68
$5.89M
DUGGAN ROBERT W
30 May 2025
Co-Chief Executive Officer
Exercised, kept
74,545
$2.64
$196.80K
Zanganeh Mahkam
30 May 2025
Co-Chief Executive Officer
Exercised, kept indirect
74,545
$2.64
$196.80K
DUGGAN ROBERT W
8 Apr 2025
Co-Chief Executive Officer
Exercised, kept
3,985,055
$1.58
$6.30M
Zanganeh Mahkam
8 Apr 2025
Co-Chief Executive Officer
Exercised, kept indirect
3,985,055
$1.58
$6.30M
Zanganeh Mahkam
3 Oct 2024
Co-Chief Executive Officer
Exercised, kept indirect
315,681
$1.58
$498.78K
Zanganeh Mahkam
27 Mar 2024
Chief Executive Officer
Buy indirect
20,000
$3.71
$74.20K
Zanganeh Mahkam
27 Mar 2024
Chief Executive Officer
Buy indirect
34,321
$3.72
$127.67K
Zanganeh Mahkam
27 Mar 2024
Chief Executive Officer
Buy
26,000
$3.72
$96.72K
Dhingra Ankur
26 Mar 2024
Chief Financial Officer
Buy indirect
100,000
$3.75
$375.00K
Zanganeh Mahkam
26 Mar 2024
Chief Executive Officer
Buy indirect
30,000
$3.75
$112.50K
Dhingra Ankur
13 Dec 2023
Chief Financial Officer
Buy indirect
19,700
$2.17
$42.75K
Dhingra Ankur
13 Dec 2023
Chief Financial Officer
Buy indirect
700
$2.15
$1.51K
Zanganeh Mahkam
12 Dec 2023
Chief Executive Officer
Buy
5,000
$2.07
$10.35K
Zanganeh Mahkam
11 Dec 2023
Chief Executive Officer
Exercised, kept indirect
315,681
$1.58
$498.78K
Zanganeh Mahkam
11 Dec 2023
Chief Executive Officer
Exercised, kept
489,814
$1.44
$705.33K
Soni Manmeet Singh
13 Oct 2023
Chief Operating Officer
Buy
2,976,190
$1.68
$5.00M
Zanganeh Mahkam
8 Mar 2023
Co-Chief Executive Officer
Buy indirect
6,748,629
$1.05
$7.09M
Zanganeh Mahkam
8 Mar 2023
Co-Chief Executive Officer
Buy indirect
804,672
$1.05
$844.91K
Zanganeh Mahkam
8 Mar 2023
Co-Chief Executive Officer
Buy
15,973,743
$1.05
$16.77M
Dhingra Ankur
7 Mar 2023
Chief Financial Officer
Buy indirect
196,362
$1.05
$206.18K
DUGGAN ROBERT W
6 Mar 2023
Chief Executive Officer
Buy
376,489,880
$1.05
$395.31M
Dhingra Ankur
16 Aug 2022
Chief Financial Officer
Buy indirect
24,658
$0.97
$23.92K
Dhingra Ankur
16 Aug 2022
Chief Financial Officer
Buy
11,557
$0.97
$11.21K
Zanganeh Mahkam
16 Aug 2022
Co-CEO & President
Buy indirect
1,030,925
$0.97
$1,000.00K
Zanganeh Mahkam
16 Aug 2022
Co-CEO & President
Buy indirect
4,593,777
$0.97
$4.46M
Zanganeh Mahkam
16 Aug 2022
Co-CEO & President
Buy
184,430
$0.97
$178.90K
DUGGAN ROBERT W
16 Aug 2022
Chief Executive Officer
Buy
94,849,203
$0.97
$92.00M
Zanganeh Mahkam
12 May 2021
Chief Operating Officer
Buy indirect
389,077
$5.24
$2.04M
DUGGAN ROBERT W
12 May 2021
Chief Executive Officer
Buy
11,365,921
$5.24
$59.56M
Powell David Jonathan
30 Nov 2020
Chief Scientific Officer
Sold after exercise
13,713
$4.44
$60.89K
Powell David Jonathan
27 Nov 2020
Chief Scientific Officer
Sold after exercise
29,569
$4.39
$129.81K
Powell David Jonathan
25 Nov 2020
Chief Scientific Officer
Sold after exercise
12,070
$4.32
$52.14K
Powell David Jonathan
24 Nov 2020
Chief Scientific Officer
Sold after exercise
11,374
$4.21
$47.88K
Powell David Jonathan
23 Nov 2020
Chief Scientific Officer
Sold after exercise
6,987
$4.40
$30.74K
DUGGAN ROBERT W
6 Nov 2020
Chief Executive Officer
Buy
14,071,856
$3.34
$47.00M

What was left out

Form 4 filings counted 105
Amendments (4/A) skipped 2
Filings about a different issuer 0
Unreadable filings 0
Joint filings 0
Sales on a Rule 10b5-1 plan 0
Sales straight out of an exercise 5
Sales at will 0
Transactions with no price 0
Shares from compensation/vesting 51,110,923
History held since 6 Oct 2020