Summit Therapeutics Inc. (SMMT) Insider Ownership

Historic Ownership Trends

Data spanning the past 90 days through December 12, 2025 reveals that Summit Therapeutics's three principal insider shareholders consist of Co Chief Executive Officer Robert W Duggan (570.15Mn shares), Director Yu Xia (32.06Mn shares), COO And Cfo Manmeet Singh Soni (3.07Mn shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares Report Date
Mahkam Zanganeh Chief Executive Officer 570,594,693 27 Mar, 2024
Robert W Duggan Co Chief Executive Officer 570,150,559 23 Oct, 2025
Yu Xia 32,057,147 23 Oct, 2025
Manmeet Singh Soni COO And Cfo 3,073,603 23 Oct, 2025
Ankur Dhingra Chief Financial Officer 394,485 08 Mar, 2023
Bhaskar Anand Chief Accounting Officer 159,751 23 Oct, 2025
Jeff Huber 44,052 13 Sep, 2024

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
21 Oct, 2025 Robert W Duggan Common Stock A 13,980,789 $18.74 570,073,879 D A
21 Oct, 2025 Manmeet Singh Soni Common Stock A 53,361 $18.74 3,073,603 D A
21 Oct, 2025 Mahkam Zanganeh Common Stock A 266,808 $18.74 25,724,474 I A
21 Oct, 2025 Bhaskar Anand Common Stock A 26,680 $18.74 159,751 D A
21 Oct, 2025 Yu Xia Common Stock A 533,617 $18.74 32,057,147 I P
21 Oct, 2025 Mahkam Zanganeh Common Stock A 26,680 $18.74 76,680 I P
21 Oct, 2025 Robert W Duggan Common Stock A 266,808 $18.74 25,724,474 I A
21 Oct, 2025 Mahkam Zanganeh Common Stock A 13,980,789 $18.74 570,073,879 I A
21 Oct, 2025 Robert W Duggan Common Stock A 26,680 $18.74 76,680 I P
10 Sep, 2025 Robert W Duggan Common Stock A 333,394 $17.68 556,088,090 D P
10 Sep, 2025 Mahkam Zanganeh Common Stock A 333,394 $17.68 556,088,090 I P
11 Sep, 2025 Robert W Duggan Common Stock A 5,000 $18.07 556,093,090 D P
11 Sep, 2025 Mahkam Zanganeh Common Stock A 5,000 $18.07 556,093,090 I P
30 May, 2025 Mahkam Zanganeh Common Stock A 74,545 $2.64 555,754,696 I M
30 May, 2025 Robert W Duggan Common Stock A 74,545 $2.64 555,754,696 D M
08 Apr, 2025 Robert W Duggan Common Stock A 3,985,055 $1.58 555,680,151 D X
08 Apr, 2025 Mahkam Zanganeh Common Stock A 3,985,055 $1.58 555,680,151 I X
03 Oct, 2024 Mahkam Zanganeh Common Stock A 315,681 $1.58 10,199,776 I X
11 Sep, 2024 Mahkam Zanganeh Common Stock A 44,052 $22.70 24,967,852 I A
11 Sep, 2024 Bhaskar Anand Common Stock A 22,026 $22.70 131,426 D A