Flagship Pioneering, LLC

CIK: 0001400240Latest portfolio: $324.0M · Q4 2025

Holdings

Total Value

$324.0M

New Positions

Closed Positions

Top Holdings

#	Stock	Shares	Value	% Portfolio	Change
1	MRNAModerna Inc	4,632,149	$136.6M	42.16%	—
2	SANASana Biotechnology Inc	25,001,856	$101.8M	31.40%	—
3	FHTXFoghorn Therapeutics Inc	12,674,120	$68.4M	21.12%	—
4	MCRBSeres Therapeutics Inc	1,155,850	$17.2M	5.32%	—

Sector Breakdown

Healthcare100.0% ($1366011017576.8T)

Filing History

Quarter	Filing Date	Portfolio Value	Holdings
Q4 2025	Feb 17, 2026	$324.0M	6
Q3 2025	Nov 14, 2025	$292.6B	8
Q2 2025	Aug 14, 2025	$268.5B	8
Q1 2025	May 15, 2025	$235.8B	8
Q4 2024	Feb 14, 2025	$334.2B	10

Fund Information

CIK0001400240

Most Recent FilingFeb 17, 2026

Number of Filings5

View on SEC EDGAR →

Flagship Pioneering, LLC is an institutional investment manager that files 13F reports with the SEC. As of the Q4 2025 filing, the fund reported a portfolio valued at $324.0M across 4 holdings. The largest position is Moderna Inc (MRNA), representing 42.2% of the portfolio. Compared to the previous quarter, the fund opened 0 new positions and closed 0 positions. 13F filings are required quarterly disclosures that provide transparency into the holdings of institutional investment managers with at least $100 million in qualifying assets.