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Super Investors / Flagship Pioneering, LLC
FP

Flagship Pioneering, LLC

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Portfolio value
$1.54B
Positions
5
Quarter ended
June 30, 2026
Filed
August 14, 2026

Reported portfolio value by quarter (40 quarters reported)

$9.55B $236M
Q3 16 Q3 18 Q3 20 Q3 22 Q3 24 Q2 26

$366M in Q3 2016 → $1.54B now. Hover for any quarter.

Holdings

As reported for the quarter ended June 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
Generate Biomedicines Inc 68.7% Unchanged 62,673,117 $1.06B
Moderna Inc 21.1% Unchanged 4,632,149 $324M
Sana Biotechnology Inc 5.7% Unchanged 25,001,856 $87.3M
Foghorn Therapeutics Inc 4.0% Unchanged 12,674,120 $61.8M
Seres Therapeutics Inc 0.6% Unchanged 1,155,850 $9.12M

Timeline of changes

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

Q2 2026

quarter ended June 30, 2026 · filed August 14, 2026

No position changes this quarter.

Q1 2026

quarter ended March 31, 2026 · filed May 15, 2026

Company Action Shares changed Value of change % of portfolio
Generate Biomedicines Inc New +62,673,117 +$783M 67.4%

Q4 2025

quarter ended December 31, 2025 · filed February 17, 2026

No position changes this quarter.

Q3 2025

quarter ended September 30, 2025 · filed November 14, 2025

No position changes this quarter.

Q2 2025

quarter ended June 30, 2025 · filed August 14, 2025

Company Action Shares changed Value of change % of portfolio
Seres Therapeutics Inc Exited −23,117,045 −$16.2M
Seres Therapeutics Inc New +1,155,850 +$12.8M 4.8%

Q1 2025

quarter ended March 31, 2025 · filed May 15, 2025

Company Action Shares changed Value of change % of portfolio
Omega Therapeutics Inc Exited −29,225,579 −$21.8M

Q4 2024

quarter ended December 31, 2024 · filed February 14, 2025

Company Action Shares changed Value of change % of portfolio
Syros Pharmaceuticals Inc Exited −1,293,849 −$2.78M

Q3 2024

quarter ended September 30, 2024 · filed November 14, 2024

No position changes this quarter.

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