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Flagship Pioneering, LLC

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13F filer, CIK 1400240, CAMBRIDGE, MA

Flagship Pioneering, LLC reported $1,539,910,719 across 5 holdings for the quarter ended 2026-06-30, in a 13F-HR filed 2026-08-14.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001193125-26-352122

Period
2026-06-30
Reported value
$1.54B
Holdings
5
Top 10 weight
100%
New
0
Sold out
0

Part of the filer group Flagship Pioneering, LLC

How groups are built

Holdings, Q2 2026

Share positions as resolved from 13F-HR 0001193125-26-352122, largest first. % of portfolio is the value over $1,539,910,719, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
GENBGENERATE BIOMEDICINES INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 62,673,117 shares; 2026Q2: 62,673,117 shares 62,673,117$1.06B68.66%0Timeline
MRNAMODERNA INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q3: 4,632,149 shares; 2024Q4: 4,632,149 shares; 2025Q1: 4,632,149 shares; 2025Q2: 4,632,149 shares; 2025Q3: 4,632,149 shares; 2025Q4: 4,632,149 shares; 2026Q1: 4,632,149 shares; 2026Q2: 4,632,149 shares 4,632,149$324M21.07%0Timeline
SANASANA BIOTECHNOLOGY INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q3: 25,001,856 shares; 2024Q4: 25,001,856 shares; 2025Q1: 25,001,856 shares; 2025Q2: 25,001,856 shares; 2025Q3: 25,001,856 shares; 2025Q4: 25,001,856 shares; 2026Q1: 25,001,856 shares; 2026Q2: 25,001,856 shares 25,001,856$87.3M5.67%0Timeline
FHTXFOGHORN THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q3: 12,674,120 shares; 2024Q4: 12,674,120 shares; 2025Q1: 12,674,120 shares; 2025Q2: 12,674,120 shares; 2025Q3: 12,674,120 shares; 2025Q4: 12,674,120 shares; 2026Q1: 12,674,120 shares; 2026Q2: 12,674,120 shares 12,674,120$61.8M4.02%0Timeline
MCRBSERES THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: 1,155,850 shares; 2025Q3: 1,155,850 shares; 2025Q4: 1,155,850 shares; 2026Q1: 1,155,850 shares; 2026Q2: 1,155,850 shares 1,155,850$9.12M0.59%0Timeline

How Q2 2026 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-HR 0001193125-26-352122 base2026-08-14acceptance time not in the bulk data set