Mass General Brigham Portfolio Concentration: Analysis of Holdings
As of June 30, 2026, Mass General Brigham's portfolio shows significant concentration with a large allocation to an unknown sector via ACWI ETF.
Mass General Brigham Inc has provided detailed data on its investment holdings as of June 30, 2026.
The total value of the reported portfolio stands at $273.2 million. Analysis reveals a notable concentration in specific assets and sectors during this period.
Examining the top holdings by weight shows that the largest position is held via an exchange-traded fund (ETF). The ISHARES TR (ACWI), representing a broad developed market index, accounts for 54.76% of the portfolio's value and holds 1,259,657 shares.
This ETF allocation is substantial compared to other individual holdings. The second largest position is Revolution Medicines Inc (RVMD), a company in the Healthcare sector with an allocation of $64.4 million or 17.85% of the portfolio, holding 344,091 shares.
The remaining significant holdings are smaller but still notable: Tango Therapeutics Inc (TNGX) and another position categorized as 'Unknown'. The Healthcare sector allocation is $75.5 million or 27.64% of the portfolio, while the largest portion ($198 million) falls under an unknown category linked to ACWI.
While Tango Therapeutics and Revolution Medicines maintain stable share counts in their respective positions (0.0%), the significant reduction of 41.5% in shares held via ACWI indicates a major shift away from this broad market exposure.