Zanganeh Mahkam, Co-Chief Executive Officer of Summit Therapeutics Inc. ($SMMT), made three open market purchases totaling $6.5 million in the last 365 days, with the most recent on October 21, 2025. This insider buying ranks 141st among nearly 5,000 individuals in our database, surpassing the average purchase amount of $1.5 million and average of 3.3 transactions. Mahkam reported no open market sales during this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. 2, 2026 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | A | Stock Option (right to buy) | 11232 | $8.76 | 11,232.0000 | 744,442,538 | 9999.99% | 0.00% |
| Oct. 21, 2025 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | A | Common Stock | 266808 | $18.74 | 606,105,809.0000 | 744,442,538 | 0.04% | 0.04% |
| Oct. 21, 2025 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | P | Common Stock | 26680 | $18.74 | 606,105,809.0000 | 744,442,538 | 0.00% | 0.00% |
| Oct. 21, 2025 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | A | Common Stock | 13980789 | $18.74 | 606,105,809.0000 | 744,442,538 | 2.36% | 1.88% |
| Sept. 10, 2025 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | P | Common Stock | 333394 | $17.68 | 591,826,532.0000 | 737,679,704 | 0.06% | 0.05% |
| Sept. 11, 2025 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | P | Common Stock | 5000 | $18.07 | 591,831,532.0000 | 737,679,704 | 0.00% | 0.00% |
| Aug. 15, 2025 | PULSE BIOSCIENCES, INC. | $PLSE | Zanganeh Mahkam | Director | A | Stock Option (right to buy) | 24134 | $0.00 | 24,134.0000 | 67,273,800 | 9999.99% | 0.04% |
| Aug. 15, 2025 | PULSE BIOSCIENCES, INC. | $PLSE | Zanganeh Mahkam | Director | A | Stock Option (right to buy) | 30000 | $0.00 | 30,000.0000 | 67,273,800 | 9999.99% | 0.04% |
| May 30, 2025 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | M | Common Stock | 74545 | $2.64 | 591,493,138.0000 | 737,679,704 | 0.01% | 0.01% |
| May 30, 2025 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | M | Stock Option (right to buy) | 74545 | $0.00 | 0.0000 | 737,679,704 | 100.00% | 0.01% |
| April 29, 2025 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | A | Stock Option (right to buy) | 400000 | $0.00 | 400,000.0000 | 737,679,704 | 9999.99% | 0.05% |
| April 29, 2025 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | A | Stock Option (right to buy) | 1040000 | $0.00 | 1,040,000.0000 | 737,679,704 | 9999.99% | 0.14% |
| April 29, 2025 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | A | Stock Option (right to buy) | 9590558 | $0.00 | 9,590,558.0000 | 737,679,704 | 9999.99% | 1.30% |
| April 8, 2025 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | X | Common Stock | 3985055 | $1.58 | 591,418,593.0000 | 737,679,704 | 0.68% | 0.54% |
| April 8, 2025 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | X | Warrant (right to buy) | 3985055 | $0.00 | 0.0000 | 737,679,704 | 0.00% | 0.54% |
| Feb. 3, 2025 | PULSE BIOSCIENCES, INC. | $PLSE | Zanganeh Mahkam | Director | X | Warrant (right to buy) | 30121 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Jan. 24, 2025 | PULSE BIOSCIENCES, INC. | $PLSE | Zanganeh Mahkam | Director | X | Common Stock | 30121 | $11.00 | 843,348.0000 | 0 | 3.70% | 0.00% |
| Feb. 3, 2025 | PULSE BIOSCIENCES, INC. | $PLSE | Zanganeh Mahkam | Director | X | Common Stock | 30121 | $11.00 | 873,469.0000 | 0 | 3.57% | 0.00% |
| Jan. 24, 2025 | PULSE BIOSCIENCES, INC. | $PLSE | Zanganeh Mahkam | Director | X | Warrant (right to buy) | 30121 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Jan. 2, 2025 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | A | Stock Option (right to buy) | 10724 | $9.18 | 85,269.0000 | 0 | 14.39% | 0.00% |
| Oct. 3, 2024 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | X | Common Stock | 315681 | $1.58 | 35,738,442.0000 | 0 | 0.89% | 0.00% |
| Oct. 3, 2024 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | X | Warrant (right to buy) | 315681 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Sept. 11, 2024 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | A | Common Stock | 44052 | $22.70 | 35,422,761.0000 | 0 | 0.12% | 0.00% |
| Aug. 23, 2024 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Chief Executive Officer | A | Performance Stock Option (right to buy) | 260000 | $0.00 | 260,000.0000 | 0 | 9999.99% | 0.00% |
| Aug. 23, 2024 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Chief Executive Officer | A | Performance Stock Option (right to buy) | 2397640 | $0.00 | 2,397,640.0000 | 0 | 9999.99% | 0.00% |
| Aug. 23, 2024 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Chief Executive Officer | A | Performance Stock Option (right to buy) | 100000 | $0.00 | 100,000.0000 | 0 | 9999.99% | 0.00% |
| Aug. 9, 2024 | PULSE BIOSCIENCES, INC. | $PLSE | Zanganeh Mahkam | Director | A | Stock Option (right to buy) | 200000 | $0.00 | 200,000.0000 | 0 | 9999.99% | 0.00% |
| July 3, 2024 | PULSE BIOSCIENCES, INC. | $PLSE | Zanganeh Mahkam | Director | P | Warrant (right to buy) | 30121 | $0.00 | 30,121.0000 | 0 | 9999.99% | 0.00% |
| July 3, 2024 | PULSE BIOSCIENCES, INC. | $PLSE | Zanganeh Mahkam | Director | P | Warrant (right to buy) | 30121 | $0.00 | 30,121.0000 | 0 | 9999.99% | 0.00% |
| July 3, 2024 | PULSE BIOSCIENCES, INC. | $PLSE | Zanganeh Mahkam | Director | X | Common Stock | 60242 | $0.00 | 813,227.0000 | 0 | 8.00% | 0.00% |
| June 6, 2024 | PULSE BIOSCIENCES, INC. | $PLSE | Zanganeh Mahkam | Director | A | Stock Option (right to buy) | 20000 | $0.00 | 20,000.0000 | 0 | 9999.99% | 0.00% |
| June 6, 2024 | PULSE BIOSCIENCES, INC. | $PLSE | Zanganeh Mahkam | Director | A | Stock Option (right to buy) | 8247 | $0.00 | 8,247.0000 | 0 | 9999.99% | 0.00% |
| March 27, 2024 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Chief Executive Officer | P | Common Stock | 34321 | $3.72 | 25,494,614.0000 | 0 | 0.13% | 0.00% |
| March 26, 2024 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Chief Executive Officer | P | Common Stock | 30000 | $3.75 | 25,474,614.0000 | 0 | 0.12% | 0.00% |
| March 27, 2024 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Chief Executive Officer | P | Common Stock | 20000 | $3.71 | 25,494,614.0000 | 0 | 0.08% | 0.00% |
| March 27, 2024 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Chief Executive Officer | P | Common Stock | 26000 | $3.72 | 25,494,614.0000 | 0 | 0.10% | 0.00% |
| Dec. 12, 2023 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Chief Executive Officer | P | Common Stock | 5000 | $2.07 | 25,384,293.0000 | 0 | 0.02% | 0.00% |
| Dec. 11, 2023 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Chief Executive Officer | X | Common Stock | 315681 | $1.58 | 25,384,293.0000 | 0 | 1.26% | 0.00% |
| Dec. 11, 2023 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Chief Executive Officer | X | Warrant (right to buy) | 489814 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Dec. 11, 2023 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Chief Executive Officer | X | Warrant (right to buy) | 315681 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Dec. 11, 2023 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Chief Executive Officer | X | Common Stock | 489814 | $1.44 | 25,379,293.0000 | 0 | 1.97% | 0.00% |
| Oct. 13, 2023 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Chief Executive Officer | A | Stock Option (right to buy) | 11988198 | $0.00 | 11,988,198.0000 | 0 | 9999.99% | 0.00% |
| March 8, 2023 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-CEO & President | P | Common Stock | 16778415 | $1.05 | 34,457,893.0000 | 0 | 94.90% | 0.00% |
| March 8, 2023 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-CEO & President | P | Common Stock | 6748629 | $1.05 | 34,457,893.0000 | 0 | 24.36% | 0.00% |
| March 8, 2023 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | P | Common Stock | 15973743 | $1.05 | 34,457,893.0000 | 0 | 86.42% | 0.00% |
| March 8, 2023 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | P | Common Stock | 6748629 | $1.05 | 34,457,893.0000 | 0 | 24.36% | 0.00% |
| March 8, 2023 | Summit Therapeutics Inc. | $SMMT | Zanganeh Mahkam | Co-Chief Executive Officer | P | Common Stock | 804672 | $1.05 | 34,457,893.0000 | 0 | 2.39% | 0.00% |