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Mass General Brigham, Inc

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13F filer, CIK 1678378, SOMERVILLE, MA

Mass General Brigham, Inc reported $468,920,924 across 6 holdings for the quarter ended 2026-03-31, in a 13F-HR filed 2026-05-05.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001214659-26-005558

Period
2026-03-31
Reported value
$469M
Holdings
6
Top 10 weight
100%
New
0
Sold out
1

Largest buys vs the previous quarter

SecurityShares changeApprox. value
MDLNadded+44,063$1.96M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Largest sells vs the previous quarter

SecurityShares changeApprox. value
ACWIreduced-2,460,478-$334M
RBRKexited-14,000-$1.07M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Holdings, Q1 2026

Share positions as resolved from 13F-HR 0001214659-26-005558, largest first. % of portfolio is the value over $468,920,924, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
ACWIISHARES TRQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not loaded; 2025Q1: not loaded; 2025Q2: not loaded; 2025Q3: not loaded; 2025Q4: 4,613,955 shares; 2026Q1: 2,153,477 shares 2,153,477$293M62.42%-2,460,478Timeline
KRMNKARMAN HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not loaded; 2025Q1: not loaded; 2025Q2: not loaded; 2025Q3: not loaded; 2025Q4: 1,562,054 shares; 2026Q1: 1,562,054 shares 1,562,054$125M26.67%0Timeline
RVMDREVOLUTION MEDICINES INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 338,191 shares; 2024Q4: not loaded; 2025Q1: not loaded; 2025Q2: not loaded; 2025Q3: not loaded; 2025Q4: 344,091 shares; 2026Q1: 344,091 shares 344,091$33.5M7.14%0Timeline
TNGXTANGO THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 354,192 shares; 2024Q4: not loaded; 2025Q1: not loaded; 2025Q2: not loaded; 2025Q3: not loaded; 2025Q4: 354,192 shares; 2026Q1: 354,192 shares 354,192$7.41M1.58%0Timeline
MAZEMAZE THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not loaded; 2025Q1: not loaded; 2025Q2: not loaded; 2025Q3: not loaded; 2025Q4: 239,994 shares; 2026Q1: 239,994 shares 239,994$7.16M1.53%0Timeline
MDLNMEDLINE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not loaded; 2025Q1: not loaded; 2025Q2: not loaded; 2025Q3: not loaded; 2025Q4: 26,294 shares; 2026Q1: 70,357 shares 70,357$3.13M0.67%+44,063Timeline

Sold out in Q1 2026

Positions in the previous quarter's report that this quarter's report no longer lists.

SecurityShares beforeValue beforeType
RBRKRUBRIK INC.14,000$1.07Mshares

How Q1 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 0001214659-26-005558 base2026-05-05acceptance time not in the bulk data set