Flagship Pioneering, LLC — 13F Holdings

2026 Q1  ·  5 Positions

2026 Q1 Portfolio Activity

In 2026 Q1, Flagship Pioneering, LLC maintained a portfolio of 5 distinct positions. The most significant new addition was GENERATE BIOMEDICINES INC, now representing 67.44% of the total fund value.
Position History hover any row below to update
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Flagship Pioneering, LLC Cambridge, MA Venture Capital / Life Sciences Investment Firm AUM $1,162M
Fund Overview SEC EDGAR
PCA Score Concentration Risk
Risk ENB
To Excel To CSV
Total Positions
5
Quarter
2026 Q1
Top Holding
N/A (67.4%)
Top 10 Concentration
100.0%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
Showing 1-5 of 5
Stock History Sector / Type Port % Prev % Rank / Prev Conviction
Freshness
Change % Change Influence Shares Mkt Value Avg Cost Price Held 1st Owned Source Source Date Date Reported
N/A
GENERATE BIOMED...
Unknown 67.44% — #1
Prev: #—
9.5
—
62,673,117 —
NEW
 62,673,117 $783,413,963 — 13F Filing 2026-03-31 2026-05-15
MRNA
MODERNA INC
Healthcare 20.26% 42.16% #2 1
Prev: #1
6.5
—
no change no change
P
S
4,632,149 $235,313,169 2018 Q4 13F Filing 2026-03-31 2026-05-15
SANA
SANA BIOTECHNOL...
Healthcare 6.20% 31.40% #3 1
Prev: #2
4.5
—
no change no change
P
S
25,001,856 $72,005,346 2021 Q1 13F Filing 2026-03-31 2026-05-15
FHTX
FOGHORN THERAPE...
Healthcare 5.22% 21.12% #4 1
Prev: #3
3.6
—
no change no change
P
S
12,674,120 $60,582,294 2020 Q4 13F Filing 2026-03-31 2026-05-15
MCRB
SERES THERAPEUT...
Healthcare 0.88% 5.32% #5 1
Prev: #4
1.9
—
no change no change
P
S
1,155,850 $10,252,390 2025 Q2 13F Filing 2026-03-31 2026-05-15
Showing 1-5 of 5 holdings

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