Ownership history in EcoR1 Capital, LLC · 10 quarters on record
This page tracks every 13F SEC filing in which EcoR1 Capital, LLC reported a position in PRIME MEDICINE INC (PRME). Data includes quarterly share count, position size as % of portfolio, estimated market value, and end-of-quarter stock price — sourced directly from SEC EDGAR 13F filings.
| Quarter | Action | Shares | Change | Chg % | % of Fund | Mkt Value | Price (EOQ) |
|---|---|---|---|---|---|---|---|
| 2025 Q3 | ADDED | 1,543,326 | +843,326 | +120.5% | 0.41% | $8.6M | $5.54 |
| 2025 Q1 | UNCHANGED | 700,000 | — | 0% | 0.08% | $1.4M | $1.99 |
| 2024 Q4 | UNCHANGED | 700,000 | — | 0% | 0.08% | $2.0M | $2.92 |
| 2024 Q3 | UNCHANGED | 700,000 | — | 0% | 0.09% | $2.7M | $3.87 |
| 2024 Q2 | UNCHANGED | 700,000 | — | 0% | 0.11% | $3.6M | $5.14 |
| 2024 Q1 | ADDED | 700,000 | +100,000 | +16.7% | 0.12% | $4.9M | $7.00 |
| 2023 Q3 | UNCHANGED | 600,000 | — | 0% | 0.19% | $5.7M | $9.54 |
| 2023 Q2 | UNCHANGED | 600,000 | — | 0% | 0.22% | $8.8M | $14.65 |
| 2023 Q1 | UNCHANGED | 600,000 | — | 0% | 0.24% | $7.4M | $12.30 |
| 2022 Q4 | INITIATED | 600,000 | — | — | 0.34% | $11.1M | — |
As of 2025 Q4 — sorted by position size