Flagship Pioneering, LLC 13F holdings
Flagship Pioneering, LLC reported 5 positions with a total reported value of $1.5B as of 2026-06-30, in its 13F for Q2 2026, filed 2026-08-14. Top holdings by reported value: GENB GENERATE BIOMEDICINES INC (68.7%), MRNA MODERNA INC (21.1%), SANA SANA BIOTECHNOLOGY INC (5.7%), FHTX FOGHORN THERAPEUTICS INC (4.0%), MCRB SERES THERAPEUTICS INC (0.6%). Against 2026-03-31 it opened 0 new positions and exited 0. Next 13F due by 2026-11-14, the legal deadline 45 days after the quarter ending 2026-09-30.
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Top holdings
| Holding | Shares | Reported value | % of portfolio |
|---|---|---|---|
| GENB GENERATE BIOMEDICINES INC | 62,673,117 | $1.1B | 68.7% |
| MRNA MODERNA INC | 4,632,149 | $324.4M | 21.1% |
| SANA SANA BIOTECHNOLOGY INC | 25,001,856 | $87.3M | 5.7% |
| FHTX FOGHORN THERAPEUTICS INC | 12,674,120 | $61.8M | 4.0% |
| MCRB SERES THERAPEUTICS INC | 1,155,850 | $9.1M | 0.6% |
New positions this quarter
No new positions.
Sold out
No positions were sold out.
Biggest increases and decreases
Increases
No position was increased.
Decreases
No position was decreased.
