Question 1

What is Flagship Pioneering, LLC's portfolio value?

Accepted Answer

As of Q4 2025, Flagship Pioneering, LLC manages $324.0M across 4 reported positions in their SEC 13F filing.

Question 2

What are Flagship Pioneering, LLC's top holdings?

Accepted Answer

Flagship Pioneering, LLC's largest 13F positions include MRNA, SANA, FHTX, representing approximately 94.7% of the reported portfolio.

Question 3

How many stocks does Flagship Pioneering, LLC hold?

Accepted Answer

Flagship Pioneering, LLC holds 4 reported positions as of their Q4 2025 13F filing.

Question 4

When did Flagship Pioneering, LLC last file a 13F?

Accepted Answer

The most recent 13F filing from Flagship Pioneering, LLC reports positions as of Q4 2025. 13F filings are required within 45 days of each calendar quarter end.

Rank	Stock	Shares	Value	% of Portfolio
1	MRNA Moderna Inc	4,632,149	$136.6M	42.16%
2	SANA Sana Biotechnology Inc	25,001,856	$101.8M	31.40%
3	FHTX Foghorn Therapeutics Inc	12,674,120	$68.4M	21.12%
4	MCRB Seres Therapeutics Inc	1,155,850	$17.2M	5.32%

Flagship Pioneering, LLC

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