Robert Nelsen, a director at Prime Medicine, Inc. ($PRME), made one open market purchase of common shares in the last 365 days, totaling nearly $10 million. His most recent buy occurred on August 1, 2025. This places him 109th among 4,983 individual insiders by purchase amount, well above the average of $1.5 million per insider and 3.29 transactions. Nelsen 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Aug. 1, 2025 | Prime Medicine, Inc. | $PRME | NELSEN ROBERT | Director | D | Stock Option (right to buy) | 39062 | $0.00 | 0.0000 | 131,160,842 | 100.00% | 0.03% |
| Aug. 1, 2025 | Prime Medicine, Inc. | $PRME | NELSEN ROBERT | Director | A | Stock Option (right to buy) | 39062 | $0.00 | 39,062.0000 | 131,160,842 | 9999.99% | 0.03% |
| Aug. 1, 2025 | Prime Medicine, Inc. | $PRME | NELSEN ROBERT | Director | D | Stock Option (right to buy) | 45000 | $0.00 | 0.0000 | 131,160,842 | 100.00% | 0.03% |
| Aug. 1, 2025 | Prime Medicine, Inc. | $PRME | NELSEN ROBERT | Director | A | Stock Option (right to buy) | 45000 | $0.00 | 45,000.0000 | 131,160,842 | 9999.99% | 0.03% |
| Aug. 1, 2025 | Prime Medicine, Inc. | $PRME | NELSEN ROBERT | Director | P | Common Stock | 3030300 | $3.30 | 18,502,974.0000 | 131,160,842 | 19.58% | 2.31% |
| June 5, 2025 | Sana Biotechnology, Inc. | $SANA | NELSEN ROBERT | Not found | A | Stock Option (Right to Buy) | 80000 | $0.00 | 80,000.0000 | 225,024,899 | 9999.99% | 0.04% |
| June 4, 2025 | Prime Medicine, Inc. | $PRME | NELSEN ROBERT | Director | A | Stock Option (right to buy) | 55000 | $0.00 | 55,000.0000 | 131,160,842 | 9999.99% | 0.04% |
| June 6, 2024 | Sana Biotechnology, Inc. | $SANA | NELSEN ROBERT | Not found | A | Stock Option (Right to Buy) | 65000 | $0.00 | 65,000.0000 | 0 | 9999.99% | 0.00% |
| June 14, 2024 | Lyell Immunopharma, Inc. | $LYEL | NELSEN ROBERT | Not found | A | Option (right to buy) | 130000 | $0.00 | 130,000.0000 | 0 | 9999.99% | 0.00% |
| June 12, 2024 | Prime Medicine, Inc. | $PRME | NELSEN ROBERT | Director | A | Stock Option (right to buy) | 45000 | $0.00 | 45,000.0000 | 0 | 9999.99% | 0.00% |
| June 6, 2024 | Sana Biotechnology, Inc. | $SANA | NELSEN ROBERT | Not found | A | Stock Option (Right to Buy) | 54278 | $0.00 | 54,278.0000 | 0 | 9999.99% | 0.00% |
| May 30, 2024 | Vir Biotechnology, Inc. | $VIR | NELSEN ROBERT | Director | A | Common Stock | 8000 | $0.00 | 13,534,704.0000 | 0 | 0.06% | 0.00% |
| May 30, 2024 | Vir Biotechnology, Inc. | $VIR | NELSEN ROBERT | Director | A | Stock Option (Right to Buy) | 16000 | $0.00 | 16,000.0000 | 0 | 9999.99% | 0.00% |
| Feb. 15, 2024 | Prime Medicine, Inc. | $PRME | NELSEN ROBERT | Director | P | Common Stock | 3200000 | $6.25 | 15,472,674.0000 | 0 | 26.07% | 0.00% |
| Feb. 8, 2024 | Sana Biotechnology, Inc. | $SANA | NELSEN ROBERT | Director | P | Common Stock | 727272 | $5.50 | 22,761,125.0000 | 0 | 3.30% | 0.00% |
| Feb. 8, 2024 | Sana Biotechnology, Inc. | $SANA | NELSEN ROBERT | Director | P | Common Stock | 727272 | $5.50 | 22,761,125.0000 | 0 | 3.30% | 0.00% |
| Feb. 8, 2024 | Sana Biotechnology, Inc. | $SANA | NELSEN ROBERT | Director | P | Common Stock | 363637 | $5.50 | 20,982,490.0000 | 0 | 1.76% | 0.00% |
| Sept. 8, 2023 | Lyell Immunopharma, Inc. | $LYEL | NELSEN ROBERT | Director | A | Option (right to buy) | 55000 | $0.00 | 55,000.0000 | 0 | 9999.99% | 0.00% |
| June 16, 2023 | Lyell Immunopharma, Inc. | $LYEL | NELSEN ROBERT | Director | A | Option (right to buy) | 65000 | $0.00 | 65,000.0000 | 0 | 9999.99% | 0.00% |
| June 14, 2023 | Prime Medicine, Inc. | $PRME | NELSEN ROBERT | Director | A | Stock Option (right to buy) | 39062 | $0.00 | 39,062.0000 | 0 | 9999.99% | 0.00% |
| May 22, 2023 | Vir Biotechnology, Inc. | $VIR | NELSEN ROBERT | Director | A | Stock Option (Right to Buy) | 12054 | $0.00 | 12,054.0000 | 0 | 9999.99% | 0.00% |
| May 22, 2023 | Vir Biotechnology, Inc. | $VIR | NELSEN ROBERT | Director | A | Common Stock | 6027 | $0.00 | 13,526,704.0000 | 0 | 0.04% | 0.00% |