2026Q1
| Insider | Role (last 12 mo) | Shares held | Filed at |
|---|---|---|---|
| Starr Kevin P | 10% Owner | 1,909,317 | Feb 18, 2020 |
| Third Rock Ventures II, L.P. | 10% Owner | 1,909,317 | Feb 18, 2020 |
| Third Rock Ventures GP II, L.P. | 10% Owner | 1,909,317 | Feb 18, 2020 |
| Trv Gp II, Llc | 10% Owner | 1,909,317 | Feb 18, 2020 |
| Tepper Robert I | 10% Owner | 1,909,317 | Feb 18, 2020 |
| Exec date | Filing date | Insider | Role | Signal | Confidence | Shares | % of shares | Under plan? | Amount (USD) |
|---|---|---|---|---|---|---|---|---|---|
| Mar 4, 2026 | Mar 6, 2026 | ANDERSON ELIZABETH M | Director | Neutral | 52.5 | - | 0.00% | ✗ | - |
| Mar 1, 2026 | Mar 3, 2026 | Wang Xiaolin | Officer | Neutral | 90.0 | +15,100 | 14.66% | ✗ | - |
| Mar 1, 2026 | Mar 3, 2026 | Wei Lin | Chief Medical Officer | Neutral | 90.0 | +15,100 | 17.09% | ✗ | - |
| Mar 1, 2026 | Mar 3, 2026 | Kelsey Stephen Michael | Officer | Neutral | 85.0 | +21,100 | 7.57% | ✗ | - |
| Mar 1, 2026 | Mar 3, 2026 | GOLDSMITH MARK A | Officer | Sell | 77.5 | +21,100 | 0.91% | ✓ | $3.6M |
| Mar 1, 2026 | Mar 3, 2026 | Horn Margaret A | COO | Neutral | 90.0 | +21,100 | 14.96% | ✗ | - |
| Mar 1, 2026 | Mar 3, 2026 | Cislini Jeff | General Counsel | Neutral | 90.0 | +14,500 | 30.87% | ✗ | - |
| Mar 1, 2026 | Mar 3, 2026 | Anders Jack | CFO | Neutral | 90.0 | +20,200 | 18.69% | ✗ | - |
| Feb 6, 2026 | Feb 10, 2026 | GOLDSMITH MARK A | Officer | Neutral | 52.5 | - | 0.00% | ✗ | - |
| Jan 21, 2026 | Jan 23, 2026 | Cislini Jeff | General Counsel | Sell | 46.3 | -908 | -1.90% | ✓ | $105K |
| Jan 7, 2026 | Jan 9, 2026 | Horn Margaret A | COO | Sell | 8.1 | -75,000 | -34.71% | ✓ | $7.5M |
| Jan 7, 2026 | Jan 9, 2026 | Anders Jack | CFO | Sell | 28.8 | -10,000 | -8.47% | ✓ | $980K |
| Dec 16, 2025 | Dec 18, 2025 | Cislini Jeff | General Counsel | Sell | 32.5 | -2,688 | -5.32% | ✓ | $206.5K |
| Dec 16, 2025 | Dec 18, 2025 | GOLDSMITH MARK A | Officer | Sell | 40.0 | -15,394 | -1.62% | ✓ | $1.2M |
| Dec 16, 2025 | Dec 18, 2025 | Kelsey Stephen Michael | Officer | Sell | 42.5 | -5,447 | -1.92% | ✓ | $418.4K |
| Dec 16, 2025 | Dec 18, 2025 | Horn Margaret A | COO | Sell | 35.0 | -4,847 | -3.32% | ✓ | $372.3K |
| Dec 16, 2025 | Dec 18, 2025 | Anders Jack | CFO | Sell | 41.3 | -3,104 | -2.79% | ✓ | $239.3K |
| Nov 25, 2025 | Nov 26, 2025 | Anders Jack | CFO | Sell | 35.0 | -5,418 | -4.65% | ✓ | $400.9K |
| Nov 25, 2025 | Nov 26, 2025 | GOLDSMITH MARK A | Officer | Sell | 20.0 | -66,000 | -14.71% | ✓ | $5M |
| Nov 18, 2025 | Nov 20, 2025 | GOLDSMITH MARK A | Officer | Sell | 36.3 | -20,000 | -2.04% | ✓ | $1.4M |
| Nov 18, 2025 | Nov 20, 2025 | Cislini Jeff | General Counsel | Sell | 12.5 | -13,388 | -20.98% | ✓ | $939K |
| Nov 12, 2025 | Nov 14, 2025 | GOLDSMITH MARK A | Officer | Sell | 36.3 | -20,000 | -2.04% | ✓ | $1.3M |
| Nov 11, 2025 | Nov 13, 2025 | Anders Jack | CFO | Sell | 26.3 | -10,000 | -8.26% | ✓ | $640K |
| Nov 7, 2025 | Nov 12, 2025 | GOLDSMITH MARK A | Officer | Sell | 27.5 | -30,000 | -7.45% | ✓ | $1.8M |
| Oct 17, 2025 | Oct 20, 2025 | Cislini Jeff | General Counsel | Sell | 17.5 | -12,000 | -19.22% | ✓ | $660K |
| Oct 16, 2025 | Oct 20, 2025 | GOLDSMITH MARK A | Officer | Sell | 40.0 | -20,000 | -1.40% | ✓ | $1.1M |
| Oct 13, 2025 | Oct 15, 2025 | Kelsey Stephen Michael | Officer | Sell | 23.8 | -25,000 | -8.09% | ✓ | $1.2M |
| Sep 24, 2025 | Sep 26, 2025 | Cislini Jeff | General Counsel | Sell | 37.5 | -1,799 | -3.44% | ✓ | $79.6K |
| Sep 16, 2025 | Sep 18, 2025 | Wei Lin | Chief Medical Officer | Sell | 41.3 | -2,160 | -2.39% | ✓ | $99K |
| Sep 16, 2025 | Sep 18, 2025 | Kelsey Stephen Michael | Officer | Sell | 45.0 | -5,367 | -1.85% | ✓ | $245.9K |
| Sep 16, 2025 | Sep 18, 2025 | GOLDSMITH MARK A | Officer | Sell | 42.5 | -13,411 | -1.38% | ✓ | $614.6K |
| Sep 16, 2025 | Sep 18, 2025 | Horn Margaret A | COO | Sell | 37.5 | -4,775 | -3.17% | ✓ | $218.8K |
| Sep 16, 2025 | Sep 18, 2025 | Cislini Jeff | General Counsel | Sell | 37.5 | -1,869 | -3.46% | ✓ | $85.6K |
| Sep 16, 2025 | Sep 18, 2025 | Anders Jack | CFO | Sell | 41.3 | -2,320 | -2.05% | ✓ | $106.3K |
| Aug 5, 2024 | Apr 28, 2025 | Clyburn Frank | Director | Neutral | 52.5 | - | 0.00% | ✗ | - |
| Sep 16, 2024 | Sep 18, 2024 | Anders Jack | CFO | Sell | 41.3 | -2,244 | -2.22% | ✓ | $99.2K |
| Sep 16, 2024 | Sep 18, 2024 | GOLDSMITH MARK A | Officer | Sell | 42.5 | -11,715 | -1.41% | ✓ | $517.6K |
| Sep 16, 2024 | Sep 18, 2024 | Horn Margaret A | COO | Sell | 37.5 | -4,331 | -3.17% | ✓ | $191.4K |
| Sep 16, 2024 | Sep 18, 2024 | Kelsey Stephen Michael | Officer | Sell | 45.0 | -4,665 | -1.73% | ✓ | $206.1K |
| Sep 16, 2024 | Sep 18, 2024 | Cislini Jeff | General Counsel | Sell | 37.5 | -1,454 | -3.09% | ✓ | $64.2K |
| Sep 13, 2024 | Sep 16, 2024 | Kelsey Stephen Michael | Officer | Sell | 30.0 | -16,667 | -5.83% | ✓ | $722.1K |
| Aug 21, 2024 | Aug 23, 2024 | Weber Barbara | Director | Sell | 22.5 | -1,808 | -9.01% | ✗ | $81.1K |
| Aug 13, 2024 | Aug 15, 2024 | Kelsey Stephen Michael | Officer | Sell | 30.0 | -16,667 | -5.83% | ✓ | $716.4K |
| Aug 5, 2024 | Aug 7, 2024 | Clyburn Frank | Director | Neutral | 90.0 | +6,932 | 100.00% | ✗ | - |
| Aug 7, 2024 | Clyburn Frank | Director | Neutral | 52.5 | - | 0.00% | ✗ | - | |
| Aug 1, 2024 | Aug 2, 2024 | GOLDSMITH MARK A | Officer | Sell | 42.5 | -10,000 | -1.19% | ✓ | $458.8K |
| Jul 15, 2024 | Jul 17, 2024 | Kelsey Stephen Michael | Officer | Sell | 30.0 | -16,667 | -5.83% | ✓ | $774.5K |
| Jul 12, 2024 | Jul 16, 2024 | GOLDSMITH MARK A | Officer | Sell | 23.8 | -35,000 | -8.80% | ✓ | $1.6M |
| Jul 9, 2024 | Jul 10, 2024 | Cislini Jeff | General Counsel | Sell | 37.5 | -2,399 | -4.85% | ✓ | $98K |
| Jul 9, 2024 | Jul 10, 2024 | Patel Sushil | Director | Sell | 28.8 | -2,155 | -9.75% | ✓ | $94.8K |
| Jun 20, 2024 | Jun 28, 2024 | ANDERSON ELIZABETH M | Director | Neutral | 85.0 | +4,248 | 9.92% | ✗ | - |
| Jun 20, 2024 | Jun 28, 2024 | Borellini Flavia | Director | Neutral | 90.0 | +4,248 | 24.09% | ✗ | - |
| Jun 20, 2024 | Jun 28, 2024 | Weber Barbara | Director | Neutral | 90.0 | +4,248 | 26.84% | ✗ | - |
| Jun 20, 2024 | Jun 28, 2024 | Kim Lorence H. | Director | Neutral | 85.0 | +4,248 | 6.47% | ✗ | - |
| Jun 20, 2024 | Jun 28, 2024 | Borisy Alexis | Director | Neutral | 55.0 | +4,248 | 0.18% | ✗ | - |
| Jun 20, 2024 | Jun 28, 2024 | Patel Sushil | Director | Neutral | 90.0 | +4,248 | 27.06% | ✗ | - |
| Jun 20, 2024 | Jun 28, 2024 | Horning Sandra | Director | Neutral | 82.5 | +2,945 | 3.25% | ✗ | - |
| Jun 26, 2024 | Jun 27, 2024 | Cislini Jeff | General Counsel | Sell | 37.5 | -2,000 | -3.88% | ✓ | $76.9K |
| Jun 24, 2024 | Jun 26, 2024 | Kelsey Stephen Michael | Officer | Sell | 35.0 | -16,667 | -3.00% | ✓ | $651K |
| Jun 20, 2024 | Jun 24, 2024 | Horning Sandra | Director | Neutral | 85.0 | +4,800 | 5.30% | ✗ | - |
| Jun 20, 2024 | Jun 24, 2024 | Patel Sushil | Director | Neutral | 90.0 | +4,800 | 30.57% | ✗ | - |
| Jun 20, 2024 | Jun 24, 2024 | Borisy Alexis | Director | Neutral | 60.0 | +4,800 | 0.21% | ✗ | - |
| Jun 20, 2024 | Jun 24, 2024 | Kim Lorence H. | Director | Neutral | 85.0 | +4,800 | 7.31% | ✗ | - |
| Jun 20, 2024 | Jun 24, 2024 | Weber Barbara | Director | Neutral | 90.0 | +4,800 | 30.33% | ✗ | - |
| Jun 20, 2024 | Jun 24, 2024 | Borellini Flavia | Director | Neutral | 90.0 | +4,800 | 27.22% | ✗ | - |
| Jun 20, 2024 | Jun 24, 2024 | ANDERSON ELIZABETH M | Director | Neutral | 90.0 | +4,800 | 11.21% | ✗ | - |
| Jun 17, 2024 | Jun 20, 2024 | GOLDSMITH MARK A | Officer | Sell | 42.5 | -11,950 | -1.41% | ✓ | $446.8K |
| Jun 17, 2024 | Jun 20, 2024 | Anders Jack | CFO | Sell | 45.0 | -1,893 | -1.84% | ✓ | $70.8K |
| Jun 17, 2024 | Jun 20, 2024 | Horn Margaret A | COO | Sell | 37.5 | -4,415 | -3.13% | ✓ | $165.1K |
| Jun 17, 2024 | Jun 20, 2024 | Kelsey Stephen Michael | Officer | Sell | 45.0 | -3,349 | -1.23% | ✓ | $125.2K |
| Jun 17, 2024 | Jun 20, 2024 | Cislini Jeff | General Counsel | Sell | 37.5 | -1,757 | -3.30% | ✓ | $65.7K |
| Jun 17, 2024 | Jun 20, 2024 | Wei Lin | Chief Medical Officer | Sell | 42.5 | -5,589 | -7.31% | ✗ | $209K |
| Jun 3, 2024 | Jun 5, 2024 | GOLDSMITH MARK A | Officer | Sell | 45.0 | -7,500 | -0.88% | ✓ | $299.9K |
| May 21, 2024 | May 22, 2024 | Cislini Jeff | General Counsel | Sell | 41.3 | -1,500 | -2.76% | ✓ | $58.7K |
| May 3, 2024 | May 3, 2024 | Anders Jack | CFO | Sell | 26.3 | -10,000 | -8.93% | ✓ | $400.3K |
| Apr 10, 2024 | Apr 12, 2024 | GOLDSMITH MARK A | Officer | Sell | 35.0 | -17,500 | -3.29% | ✓ | $619.5K |
| Apr 10, 2024 | Apr 12, 2024 | Patel Sushil | Director | Sell | 25.0 | -2,155 | -12.07% | ✓ | $79.7K |
| Mar 29, 2024 | Wei Lin | Chief Medical Officer | Neutral | 52.5 | - | 0.00% | ✗ | - | |
| Mar 27, 2024 | Mar 28, 2024 | Cislini Jeff | General Counsel | Sell | 45.0 | -1,500 | -2.68% | ✓ | $46.5K |
| Mar 18, 2024 | Mar 20, 2024 | Cislini Jeff | General Counsel | Sell | 45.0 | -1,252 | -2.19% | ✓ | $39.5K |
| Mar 18, 2024 | Mar 20, 2024 | Kelsey Stephen Michael | Officer | Sell | 47.5 | -2,123 | -0.78% | ✓ | $67.1K |
| Mar 18, 2024 | Mar 20, 2024 | Horn Margaret A | COO | Sell | 41.3 | -2,914 | -2.05% | ✓ | $92K |
| Mar 18, 2024 | Mar 20, 2024 | GOLDSMITH MARK A | Officer | Sell | 47.5 | -5,788 | -0.67% | ✓ | $182.8K |
| Mar 18, 2024 | Mar 20, 2024 | Anders Jack | CFO | Sell | 48.8 | -1,261 | -1.22% | ✓ | $39.8K |
| Mar 11, 2024 | Mar 13, 2024 | Horn Margaret A | COO | Sell | 26.3 | -23,671 | -7.67% | ✓ | $805.7K |
| Mar 1, 2024 | Mar 5, 2024 | Horn Margaret A | COO | Neutral | 90.0 | +41,000 | 40.41% | ✗ | - |
| Mar 1, 2024 | Mar 5, 2024 | GOLDSMITH MARK A | Officer | Neutral | 27.5 | -90,000 | -9.43% | ✗ | - |
| Mar 1, 2024 | Mar 5, 2024 | Cislini Jeff | General Counsel | Neutral | 90.0 | +21,000 | 58.13% | ✗ | - |
| Mar 1, 2024 | Mar 5, 2024 | Kelsey Stephen Michael | Officer | Neutral | 90.0 | +51,400 | 23.19% | ✗ | - |
| Mar 1, 2024 | Mar 5, 2024 | Anders Jack | CFO | Neutral | 90.0 | +26,400 | 34.37% | ✗ | - |
| Mar 1, 2024 | Mar 5, 2024 | Wang Xiaolin | Officer | Neutral | 90.0 | +24,200 | 40.12% | ✗ | - |
| Jan 22, 2024 | Jan 24, 2024 | Cislini Jeff | General Counsel | Sell | 41.3 | -1,500 | -3.99% | ✓ | $40.5K |
| Jan 8, 2024 | Jan 10, 2024 | Kelsey Stephen Michael | Officer | Sell | 45.0 | -3,337 | -1.48% | ✓ | $96.8K |
| Jan 2, 2024 | Jan 4, 2024 | Kelsey Stephen Michael | Officer | Sell | 30.0 | -13,330 | -5.59% | ✓ | $387.9K |
| Dec 27, 2023 | Dec 29, 2023 | Kelsey Stephen Michael | Officer | Sell | 22.5 | -33,334 | -12.27% | ✓ | $967K |
| Dec 18, 2023 | Dec 20, 2023 | Anders Jack | CFO | Sell | 45.0 | -1,775 | -2.27% | ✓ | $46K |
| Dec 18, 2023 | Dec 20, 2023 | GOLDSMITH MARK A | Officer | Sell | 45.0 | -8,165 | -1.04% | ✓ | $211.5K |
| Dec 18, 2023 | Dec 20, 2023 | Cislini Jeff | General Counsel | Sell | 41.3 | -1,229 | -3.19% | ✓ | $31.8K |
| Dec 18, 2023 | Dec 20, 2023 | Kelsey Stephen Michael | Officer | Sell | 47.5 | -2,088 | -0.76% | ✓ | $54.1K |
| Dec 15, 2023 | Dec 19, 2023 | Horn Margaret A | COO | Sell | 32.5 | -7,993 | -7.30% | ✓ | $210.7K |