Flagship Pioneering Inc.

Q3 2025 13F Holdings Report, Stock Holdings

Notable people
Noubar Afeyan
Signature - Title
Noubar B. Afeyan, Ph.D. - Chief Executive Officer
Location
Cambridge, MA
Holdings as of
September 30, 2025
Value $
$293M
Num holdings
4
Date filed
11/14/2025, 04:01 PM
Form type
13F-HR
Description
All US holdings of this investor are reported in this report. Top holdings included MRNA, SANA, FHTX, and MCRB.
Previous filing
Q2 2025 - Aug 14, 2025
SEC
View on sec.gov
Sym Weight Trade Impact Company Class Shares Change Activity Value Change $ Value $ * Price $ Shares Principal
Filing 2025 Q3 compared to 2025 Q2 by default.
* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.

Person Signing this Report on Behalf of Reporting Manager:

Name Title City, State Date
Noubar B. Afeyan, Ph.D. Chief Executive Officer Cambridge, Massachusetts 11/14/2025

Other Included Managers (3):

Num Name Location File Number
1 Flagship Ventures Fund V General Partner LLC Cambridge, MA 028-18466
2 Flagship Ventures Fund IV General Partner LLC Cambridge, MA 028-17238
3 Noubar Afeyan Cambridge, MA 028-19988