Institutional
Flagship Pioneering, LLC
CIK 0001400240
$1.16B
Reported AUM
5
Positions
Q1 2026
Period
2026-05-15
Filed
The Brief · Flagship Pioneering, LLC · Q1 2026
AI · grounded in 13F
Flagship Pioneering, LLC established a new position in GENB with an investment of $783.4M. This addition represents the fund's only change to its portfolio this period. The fund now manages 5 positions with total assets under management of $1.16B.
Portfolio · Q1 2026
Top holdings
| # | Stock | Issuer | Price | Day % | 1Y Gr. | 5Y Gr. | Value | % of book | Δ shares (QoQ) | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | GENB | GENERATE BIOMEDICINES INC | $13.08 | -0.46% | 3.87% | 5.12% | $783.4M | 67.44% | — | HELD |
| 2 | MRNA | MODERNA INC | $54.49 | -2.36% | 102.16% | -85.19% | $235.3M | 20.26% | — | HELD |
| 3 | SANA | SANA BIOTECHNOLOGY INC | $3.17 | -3.65% | -15.86% | -86.29% | $72.0M | 6.20% | — | HELD |
| 4 | FHTX | FOGHORN THERAPEUTICS INC | $4.74 | -7.60% | 2.81% | -60.48% | $60.6M | 5.22% | — | HELD |
| 5 | MCRB | SERES THERAPEUTICS INC | $4.65 | -3.13% | -65.69% | -96.26% | $10.3M | 0.88% | — | HELD |
Source: SEC EDGAR · accession 0001193125-26-226588. 13F discloses long positions only — shorts, foreign equities, and options are excluded.