Flagship Pioneering Inc. Portfolio Holdings

Flagship Pioneering Inc.

$270 Million
Q3 2025

Flagship Pioneering Inc. has filed its 13F form on November 14, 2025 for Q3 2025 where it was disclosed a total value porftolio of $270 Million distributed in 8 stocks.

Among their holdings, we can observe that their the top five positions include companies like: Moderna, Inc. with a value of $120M, Sana Biotechnology, Inc. with a value of $88.8M, Foghorn Therapeutics Inc. with a value of $62M, and Seres Therapeutics Inc with a value of $0.

Examining the 13F form we can see an increase of $14.8M in the current position value, from $256M to 270M.

Flagship Pioneering Inc. is based out at Cambridge, MA

Below you can find more details about Flagship Pioneering Inc. portfolio as well as his latest detailed transactions.

Portfolio value $270 Million

Healthcare: $270 Million

Stock Holdings Table

Stock	Market Cap.	Holding Value (Reported)	# of Shares.	Last Trade
MRNA Moderna, Inc. Healthcare	$9.69B	$120 Million 44.25% of portfolio	4,632,149	Q2 2024 Reduced 52.08%
SANA Sana Biotechnology, Inc. Healthcare	$759M	$88.8 Million 32.83% of portfolio	25,001,856	Q4 2023 Reduced 24.9%
FHTX Foghorn Therapeutics Inc. Healthcare	$195M	$62 Million 22.92% of portfolio	12,674,120	Q4 2020 New
Seres Therapeutics Inc	-	$0 0.0% of portfolio	-	Q2 2025 New

Summary

Portfolio
No. of Stocks 8
Current Value $270 Million
Prior Value $256 Million
Filing
Period Q3 2025
Filing Date November 14, 2025
Form Type 13F-HR
Activity in Q3 2025
New Purchases 0 stocks
Additional Purchases 0 stocks
Sold out of 0 stocks
Reduced holdings in 0 stocks

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Flagship Pioneering Inc. Portfolio Holdings