StockDriftsStockDriftsTop 4 Flagship Pioneering LLC Holdings
| Stock | Company | % Port. | Shares | Value | Activity | Ownership | Avg. Cost | Date |
|---|---|---|---|---|---|---|---|---|
| MRNA | MODERNA INC | 21.07% | 4.63M | $324.4M | +0.00%(+0) | $15.27(+314.67%) | 2026-06-30 | |
| SANA | SANA BIOTECHNOLOGY INC | 5.67% | 25.00M | $87.3M | +0.00%(+0) | $33.47(-89.39%) | 2026-06-30 | |
| FHTX | FOGHORN THERAPEUTICS INC | 4.02% | 12.67M | $61.8M | +0.00%(+0) | $20.27(-69.12%) | 2026-06-30 | |
| MCRB | SERES THERAPEUTICS INC | 0.59% | 1.16M | $9.1M | +0.00%(+0) | $214.27(-97.88%) | 2026-06-30 |
| Performance Metric | 3-Year Annualized | 3-Year Cumulative | 5-Year Annualized | 5-Year Cumulative |
|---|---|---|---|---|
| Top 20 Holdings Weighted | -18.34% | -45.54% | -27.69% | -80.23% |
| Top 20 Holdings Unweighted | -16.73% | -42.26% | -35.09% | -88.48% |
Flagship Pioneering LLC reports $1.54B in US-listed equity holdings across 5 positions in its most recent 13F filing. Its largest disclosed positions are MRNA (21.1%), SANA (5.7%) and FHTX (4.0%). The top 20 holdings account for 31.35% of reported assets. Its disclosed equity book has returned -45.54% on a three-year cumulative basis. Figures reflect the Q2 2026 filing.
Sign up free to track Flagship Pioneering LLC, compare funds side by side, and get alerts the moment positions change.
Holdings on this page are parsed from Flagship Pioneering LLC’s Form 13F filings with the U.S. Securities and Exchange Commission (CIK 1400240). View Flagship Pioneering LLC’s 13F filings on SEC