Flagship Pioneering, LLC
CIK 0001400240 · CAMBRIDGE, MA · Quarter end: 2026-06-30 · Filed on: 2026-08-14 · Open the SEC source ↗
Portfolio Value (AUM)Total value of the fund's US stock portfolio reported to the SEC.
$1.54B
2026 Q2
Positions
5
Top-10 ConcentrationHow much of the portfolio sits in the 10 largest holdings. High = concentrated bets.
100.0%
Est. Net Flow (Q)
—
2026 Q2
Top Holdings
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%
New / Increased
No prior quarter data
Reduced / Exited
No prior quarter data
Read the 2026-Q2 quarterly report · 13F Filing Calendar
13F data shows quarter-end positions, is delayed by up to 45 days and covers only long positions in US-listed securities; short positions, most derivatives and non-US assets are not reported.