Flagship Pioneering, LLC

CIK 1400240 · View on SEC EDGAR ↗

Portfolio value: $1.5B
Positions: 5
As of: June 30, 2026

Portfolio value QoQ: +32.8% 13F does not disclose cash

Top 10 holdings weight: 100.00%
Top 25 holdings weight: 100.00%
Positions above 1%: 4
Effective number of positions: 1.9

Based on 13F long-equity holdings only (cash, bonds, shorts not disclosed)

Turnover Q2 2026: 0.0% Est. buys $0 · sells $0

Median holding: 5.0 quarters Tracked Q4 2024–Q2 2026 · 71.4% still held

New positions: 0
Increased: 0
Decreased: 0
Closed: 1

On this page

Sector breakdown How the portfolio splits across market sectors.
Portfolio Every stock this institution reports holding, from its latest 13F.
Top moves The biggest position increases and decreases this quarter.
Exited positions Positions the manager fully sold out of last quarter.

Sector breakdown

Healthcare

31.1%

Other/Unmapped

68.9%

Full portfolio 5 positions


Unknown issuer (CUSIP: 370920100)	$1,057,295,483	68.93%	62,673,117	$273,881,520
MRNA Moderna, Inc. - Common Stock	$324,114,597	21.13%	4,628,225	$89,000,767
SANA Sana Biotechnology, Inc. - Common Stock	$87,256,477	5.69%	25,001,856	$15,251,131
FHTX Foghorn Therapeutics Inc. - Common Stock	$61,849,706	4.03%	12,674,120	$1,267,412
MCRB Seres Therapeutics, Inc. - Common Stock	$3,334,654	0.22%	422,643	$-414,190
No matches

Top movers (QoQ)

Security	Action	Shares Δ	Value Δ
—	Price move only	+0	+$273.9M
MRNA	Price move only	+0	+$89.0M
SANA	Price move only	+0	+$15.3M
FHTX	Price move only	+0	+$1.3M
MCRB	Price move only	+0	-$414K

Exited positions

Includes corporate events (mergers, delistings) — not all exits are sells

Closed positions reflect 13F reporting changes; for index managers these are often mechanical (delisting, M&A, index rebalancing), not active decisions.

Security	Quarter	Shares before	Value before	Price since exit
OMGAQ	March 31, 2025	6,984,856	$5,207,908	No longer tracked