Summit Therapeutics Inc. (SMMT) Insider Ownership

Historic Insider Ownership Trends

As of March 23, 2026, the three largest insider holders of SMMT are Mahkam Zanganeh (Co Chief Executive Officer, 570.07Mn shares), Yu Xia (Director, 32.06Mn shares), Manmeet Singh Soni (Coo And Cfo, 3.07Mn shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Mahkam Zanganeh Co Chief Executive Officer 0 570,073,879 23 Oct, 2025
Yu Xia 0 32,057,147 23 Oct, 2025
Manmeet Singh Soni Coo And Cfo 3,073,603 0 23 Oct, 2025
Mahkam Zanganeh Chief Executive Officer 520,814 0 27 Mar, 2024
Ankur Dhingra Chief Financial Officer 0 354,958 27 Mar, 2024
Bhaskar Anand Chief Accounting Officer 159,751 0 23 Oct, 2025
Ankur Dhingra Chief Financial Officer 38,057 0 17 Aug, 2022

* 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
08 Jan, 2026 Bhaskar Anand Stock Option (right to buy) A 30,000 - 30,000 D A
02 Jan, 2026 Alessandra Cesano Stock Option (right to buy) A 35,000 - 35,000 D A
02 Jan, 2026 Mahkam Zanganeh Stock Option (right to buy) A 11,232 $8.76 11,232 I A
02 Jan, 2026 Yu Xia Stock Option (right to buy) A 35,000 - 35,000 D A
02 Jan, 2026 Kenneth A Clark Stock Option (right to buy) A 35,000 - 35,000 D A
02 Jan, 2026 Kenneth A Clark Stock Option (right to buy) A 17,796 $8.76 17,796 D A
02 Jan, 2026 Alessandra Cesano Stock Option (right to buy) A 3,219 $8.76 3,219 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 Mahkam Zanganeh Common Stock A 13,980,789 $18.74 570,073,879 I A
18 Sep, 2025 Bhaskar Anand Stock Option (right to buy) A 50,000 - 50,000 D A
10 Sep, 2025 Mahkam Zanganeh Common Stock A 333,394 $17.68 556,088,090 I 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 Mahkam Zanganeh Stock Option (right to buy) D 74,545 $0.00 0 I M
29 Apr, 2025 Mahkam Zanganeh Stock Option (right to buy) A 1,040,000 - 1,040,000 D A
29 Apr, 2025 Manmeet Singh Soni Stock Option (right to buy) A 11,200,000 - 11,200,000 D A