Flagship Pioneering, LLC Long-Term Concentrated

Location: Cambridge, MA

CIK: 0001400240 · Show all filings

Period: Q1 2026 (← Previous)

Filing Date: May 15, 2026

Total Value: $1.162B (100.0% shares, 0.0% debt)

Holdings (5)

New Positions (1)

GENB GENERATE BIOMEDICINES INC 67.4%

Value $783M Shares 62,673,117 Est. Cost $12.50 Unrealized —

Ticker	Issuer	Shares	Value	%	Est. Cost	Unrealized	Class	CUSIP
GENB	GENERATE BIOMEDICINES INC	62,673,117	$783M	67.4%	$12.50	—	COM SHS	370920100

Unchanged Positions (4)

MRNA MODERNA INC 20.3%

Value $235M Shares 4,632,149 Est. Cost $16.43 Unrealized +161.3%

SANA SANA BIOTECHNOLOGY INC 6.2%

Value $72.01M Shares 25,001,856 Est. Cost $32.56 Unrealized -86.7%

FHTX FOGHORN THERAPEUTICS INC 5.2%

Value $60.58M Shares 12,674,120 Est. Cost $19.16 Unrealized -70.3%

MCRB SERES THERAPEUTICS INC 0.9%

Value $10.25M Shares 1,155,850 Est. Cost $8.80 Unrealized +52.1%

Ticker	Issuer	Shares	Value	%	Est. Cost	Unrealized	Class	CUSIP
MRNA	MODERNA INC	4,632,149	$235M	20.3%	$16.43	+161.3%	COM	60770K107
SANA	SANA BIOTECHNOLOGY INC	25,001,856	$72.01M	6.2%	$32.56	-86.7%	COM	799566104
FHTX	FOGHORN THERAPEUTICS INC	12,674,120	$60.58M	5.2%	$19.16	-70.3%	COM	344174107
MCRB	SERES THERAPEUTICS INC	1,155,850	$10.25M	0.9%	$8.80	+52.1%	COM NEW	81750R201