Flagship Pioneering, LLC - Stock Holdings in 13F Filings (SEC)

Updated on March 15, 2026.

Based on 13F Filings filed with the SEC on February 17, 2026, for the 2025 Q4 period, Flagship Pioneering, LLC held in its portfolio 4 assets valued at $324,036,288 (i.e. $324.04M).

The most valuable assets in the portfolio included: Moderna Inc ($136.60M), Sana Biotechnology Inc ($101.76M), and Foghorn Therapeutics Inc ($68.44M).

The chart below shows the top 4 valuable assets, and the table below shows the top 4 valuable assets.

You can see similar for other investment managers.

Related Topics: SEC Topic List.

Data Source: SEC.

Top Valuable Stocks in Flagship Pioneering, LLC Portfolio

Moderna Inc

Sana Biotechnology Inc

Foghorn Therapeutics Inc

Seres Therapeutics Inc

Flagship Pioneering, LLC - Stock Holdings in 13F Filings (SEC)

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Name of Issuer	No. of Shares	Value ($)	Class
Moderna Inc	4632149	136602075	COM
Sana Biotechnology Inc	25001856	101757555	COM
Foghorn Therapeutics Inc	12674120	68440247	COM
Seres Therapeutics Inc	1155850	17236411	COM