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Flagship Pioneering, LLC
Portfolio value QoQ: +32.8% 13F does not disclose cash
Top 10 holdings weight100.00%
Top 25 holdings weight100.00%
Positions above 1%4
Effective number of positions1.9
Based on 13F long-equity holdings only (cash, bonds, shorts not disclosed)
Turnover Q2 2026: 0.0% Est. buys $0 · sells $0
Median holding: 5.5 quarters Tracked Q1 2025–Q2 2026 · 83.3% still held
New positions0
Increased0
Decreased0
Closed0
Portfolio value
$1.5B
Positions
5
As of
June 30, 2026 Data as of Q2 2026
Sector breakdown
Full portfolio 5 positions
| Type | Streak | 8Q trend | |||||
|---|---|---|---|---|---|---|---|
| Unknown issuer (CUSIP: 370920100) | $1,057,295,483 | 68.93% | 62,673,117 | $273,881,520 | |||
| MRNA | $324,114,597 | 21.13% | 4,628,225 | $89,000,767 | |||
| SANA | $87,256,477 | 5.69% | 25,001,856 | $15,251,131 | |||
| FHTX | $61,849,706 | 4.03% | 12,674,120 | $1,267,412 | |||
| MCRB | $3,334,654 | 0.22% | 422,643 | $-414,190 | |||
| No matches | |||||||