SMMT
Summit Therapeutics PLC
NASDAQ: SMMT · HEALTHCARE · BIOTECHNOLOGY
$15.77
+2.87% today
Updated 2026-10-28
Market cap
$12.23B
P/E ratio
—
P/S ratio
3,891.31x
EPS (TTM)
$-1.11
Dividend yield
—
52W range
$12 – $29
Volume
6.4M
Summit Therapeutics PLC (SMMT) Insider transactions
Net insider activity
Net buying (100,608,043 shares)
Buy transactions
97
Sell transactions
3
All transactions
| Date | Insider | Title | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-10-08 | ANAND, BHASKAR | Chief Accounting Officer | Buy | 100,000 | — | — |
| 2026-06-12 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer, 10% Owner | Buy | 3,810,000 | $13.12 | $49.99M |
| 2026-06-12 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Buy | 3,810,000 | $13.12 | $49.99M |
| 2026-06-04 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer, 10% Owner | Buy | 100,000 | $14.60 | $1.46M |
| 2026-06-04 | SONI, MANMEET SINGH | Director, COO and CFO | Buy | 25,000 | $14.43 | $360750.00 |
| 2026-06-04 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Buy | 100,000 | $14.60 | $1.46M |
| 2026-01-08 | ANAND, BHASKAR | Chief Accounting Officer | Buy | 30,000 | — | — |
| 2026-01-02 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer, 10% Owner | Buy | 11,232 | $8.76 | $98392.32 |
| 2026-01-02 | XIA, YU | Director | Buy | 35,000 | — | — |
| 2026-01-02 | RONAGHI, MOSTAFA | Director | Buy | 35,000 | — | — |
| 2026-01-02 | HUBER, JEFF | Director | Buy | 35,000 | — | — |
| 2026-01-02 | HUBER, JEFF | Director | Buy | 9,885 | $8.76 | $86592.60 |
| 2026-01-02 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Buy | 11,232 | $8.76 | $98392.32 |
| 2026-01-02 | CLARK, KENNETH A | Director | Buy | 35,000 | — | — |
| 2026-01-02 | CLARK, KENNETH A | Director | Buy | 17,796 | $8.76 | $155892.96 |
| 2026-01-02 | CESANO, ALESSANDRA | Director | Buy | 35,000 | — | — |
| 2026-01-02 | CESANO, ALESSANDRA | Director | Buy | 3,219 | $8.76 | $28198.44 |
| 2026-01-02 | BOOTH, ROBERT F. | Director | Buy | 35,000 | — | — |
| 2026-01-02 | BOOTH, ROBERT F. | Director | Buy | 7,180 | $8.76 | $62896.80 |
| 2025-10-21 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer, 10% Owner | Buy | 13,980,789 | $18.74 | $262.00M |
| 2025-10-21 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer, 10% Owner | Buy | 266,808 | $18.74 | $5.00M |
| 2025-10-21 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer, 10% Owner | Buy | 26,680 | $18.74 | $499983.20 |
| 2025-10-21 | XIA, YU | Director | Buy | 533,617 | $18.74 | $10.00M |
| 2025-10-21 | SONI, MANMEET SINGH | Director, COO and CFO | Buy | 53,361 | $18.74 | $999985.14 |
| 2025-10-21 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Buy | 13,980,789 | $18.74 | $262.00M |
| 2025-10-21 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Buy | 266,808 | $18.74 | $5.00M |
| 2025-10-21 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Buy | 26,680 | $18.74 | $499983.20 |
| 2025-10-21 | ANAND, BHASKAR | Chief Accounting Officer | Buy | 26,680 | $18.74 | $499983.20 |
| 2025-09-18 | ANAND, BHASKAR | Chief Accounting Officer | Buy | 50,000 | — | — |
| 2025-09-11 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer, 10% Owner | Buy | 5,000 | $18.07 | $90350.00 |
| 2025-09-11 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Buy | 5,000 | $18.07 | $90350.00 |
| 2025-09-10 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer, 10% Owner | Buy | 333,394 | $17.68 | $5.89M |
| 2025-09-10 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Buy | 333,394 | $17.68 | $5.89M |
| 2025-05-30 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer, 10% Owner | Sale | 74,545 | — | — |
| 2025-05-30 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer, 10% Owner | Buy | 74,545 | $2.64 | $196798.80 |
| 2025-05-30 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Sale | 74,545 | — | — |
| 2025-05-30 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Buy | 74,545 | $2.64 | $196798.80 |
| 2025-04-29 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer, 10% Owner | Buy | 9,590,558 | — | — |
| 2025-04-29 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer, 10% Owner | Buy | 1,040,000 | — | — |
| 2025-04-29 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer, 10% Owner | Buy | 400,000 | — | — |
| 2025-04-29 | SONI, MANMEET SINGH | Director, COO and CFO | Buy | 11,200,000 | — | — |
| 2025-04-29 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Buy | 9,590,558 | — | — |
| 2025-04-29 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Buy | 1,040,000 | — | — |
| 2025-04-29 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Buy | 400,000 | — | — |
| 2025-04-29 | ANAND, BHASKAR | Chief Accounting Officer | Buy | 600,000 | — | — |
| 2025-04-29 | ANAND, BHASKAR | Chief Accounting Officer | Buy | 75,000 | — | — |
| 2025-04-08 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer, 10% Owner | Buy | 3,985,055 | — | — |
| 2025-04-08 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer, 10% Owner | Buy | 3,985,055 | $1.58 | $6.30M |
| 2025-04-08 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Buy | 3,985,055 | — | — |
| 2025-04-08 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Buy | 3,985,055 | $1.58 | $6.30M |
| 2025-01-12 | ANAND, BHASKAR | Chief Accounting Officer | Buy | 75,000 | — | — |
| 2025-01-02 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer, 10% Owner | Buy | 10,724 | $9.18 | $98446.32 |
| 2025-01-02 | XIA, YU | Director | Buy | 35,000 | — | — |
| 2025-01-02 | XIA, YU | Director | Buy | 5,438 | $9.18 | $49920.84 |
| 2025-01-02 | RONAGHI, MOSTAFA | Director | Buy | 35,000 | — | — |
| 2025-01-02 | HUBER, JEFF | Director | Buy | 35,000 | — | — |
| 2025-01-02 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Buy | 10,724 | $9.18 | $98446.32 |
| 2025-01-02 | CLARK, KENNETH A | Director | Buy | 35,000 | — | — |
| 2025-01-02 | CLARK, KENNETH A | Director | Buy | 16,991 | $9.18 | $155977.38 |
| 2025-01-02 | CESANO, ALESSANDRA | Director | Buy | 35,000 | — | — |
| 2025-01-02 | CESANO, ALESSANDRA | Director | Buy | 3,073 | $9.18 | $28210.14 |
| 2025-01-02 | BOOTH, ROBERT F. | Director | Buy | 35,000 | — | — |
| 2025-01-02 | BOOTH, ROBERT F. | Director | Buy | 6,855 | $9.18 | $62928.90 |
| 2024-10-11 | CLARK, KENNETH A | Director | Buy | 200,000 | — | — |
| 2024-10-03 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer | Sale | 315,681 | — | — |
| 2024-10-03 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer | Buy | 315,681 | $1.58 | $498775.98 |
| 2024-09-11 | ZANGANEH, MAHKAM | Director, Co-Chief Executive Officer | Buy | 44,052 | $22.70 | $999980.40 |
| 2024-09-11 | SONI, MANMEET SINGH | Director, COO and CFO | Buy | 44,052 | $22.70 | $999980.40 |
| 2024-09-11 | HUBER, JEFF | Director | Buy | 44,052 | $22.70 | $999980.40 |
| 2024-09-11 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Buy | 3,325,991 | $22.70 | $75.50M |
| 2024-09-11 | ANAND, BHASKAR | Chief Accounting Officer | Buy | 22,026 | $22.70 | $499990.20 |
| 2024-08-23 | ZANGANEH, MAHKAM | Director, Chief Executive Officer | Buy | 2,397,640 | — | — |
| 2024-08-23 | ZANGANEH, MAHKAM | Director, Chief Executive Officer | Buy | 260,000 | — | — |
| 2024-08-23 | ZANGANEH, MAHKAM | Director, Chief Executive Officer | Buy | 100,000 | — | — |
| 2024-08-23 | SONI, MANMEET SINGH | Director, COO and CFO | Buy | 2,800,000 | — | — |
| 2024-06-27 | HUBER, JEFF | Director | Buy | 200,000 | — | — |
| 2024-06-27 | HUBER, JEFF | Director | Buy | 17,883 | — | — |
| 2024-04-11 | RONAGHI, MOSTAFA | Director | Buy | 200,000 | — | — |
| 2024-04-11 | RONAGHI, MOSTAFA | Director | Buy | 25,315 | — | — |
| 2024-04-02 | SONI, MANMEET SINGH | Director, Chief Operating Officer | Buy | 1,100,000 | — | — |
| 2024-04-02 | ANAND, BHASKAR | Chief Accounting Officer | Buy | 600,000 | — | — |
| 2024-03-27 | ZANGANEH, MAHKAM | Director, Chief Executive Officer | Buy | 34,321 | $3.72 | $127674.12 |
| 2024-03-27 | ZANGANEH, MAHKAM | Director, Chief Executive Officer | Buy | 26,000 | $3.72 | $96720.00 |
| 2024-03-27 | ZANGANEH, MAHKAM | Director, Chief Executive Officer | Buy | 20,000 | $3.71 | $74200.00 |
| 2024-03-26 | ZANGANEH, MAHKAM | Director, Chief Executive Officer | Buy | 30,000 | $3.75 | $112500.00 |
| 2024-03-26 | DHINGRA, ANKUR | Chief Financial Officer | Buy | 100,000 | $3.75 | $375000.00 |
| 2024-01-02 | XIA, YU | Director | Buy | 200,000 | — | — |
| 2024-01-02 | XIA, YU | Director | Buy | 35,000 | — | — |
| 2024-01-02 | MAHATME, UJWALA | Director | Buy | 52,575 | $1.32 | $69399.00 |
| 2024-01-02 | MAHATME, UJWALA | Director | Buy | 35,000 | — | — |
| 2024-01-02 | DUGGAN, ROBERT W | Director, Co-Chief Executive Officer, 10% Owner | Buy | 74,545 | $1.32 | $98399.40 |
| 2024-01-02 | CLARK, KENNETH A | Director | Buy | 70,492 | $1.32 | $93049.44 |
| 2024-01-02 | CLARK, KENNETH A | Director | Buy | 35,000 | — | — |
| 2024-01-02 | CESANO, ALESSANDRA | Director | Buy | 35,000 | — | — |
| 2024-01-02 | CESANO, ALESSANDRA | Director | Buy | 21,363 | $1.32 | $28199.16 |
| 2024-01-02 | BOOTH, ROBERT F. | Director | Buy | 47,651 | $1.32 | $62899.32 |
| 2024-01-02 | BOOTH, ROBERT F. | Director | Buy | 35,000 | — | — |
| 2023-12-13 | DHINGRA, ANKUR | Chief Financial Officer | Buy | 19,700 | $2.17 | $42749.00 |
| 2023-12-13 | DHINGRA, ANKUR | Chief Financial Officer | Buy | 700 | $2.15 | $1505.00 |
| 2023-12-12 | ZANGANEH, MAHKAM | Director, Chief Executive Officer | Buy | 5,000 | $2.07 | $10350.00 |
Frequently asked questions
Are SMMT insiders buying or selling?
Over the transactions on record, SMMT insiders have been net buyers, with about $0.00 in stock sold across 3 sales, against 53 open-market purchases.
Does insider selling at SMMT mean the stock will fall?
Not by itself. Most executive selling is pre-scheduled through 10b5-1 plans filed months in advance, and insiders sell for diversification, taxes, and liquidity far more often than out of any view on the price. Insider buying is the stronger signal, especially when several insiders buy around the same time, because there is usually only one reason to put personal cash into the stock.
Which SMMT insiders are selling the most?
Recent selling is concentrated in a few names. ZANGANEH, MAHKAM accounts for the largest share on record, with about $0.00 sold. Selling by one or two individuals matters less than broad selling across the whole leadership team, which is the pattern worth watching.