Funds · 13F filer · Somerville, MA

Mass General Brigham, Inc

$361.1M in 6 U.S. stocks and ETFs at the end of June 30, 2026, as reported to the SEC.1

Returns–Not enough quarters yet

These returns are for its stock picks as disclosed on Form 13F: last quarter's holdings, valued at this quarter's prices. They miss trades within each quarter, short positions, options, bonds, cash and fees, so they aren't the returns its clients got.

Top holdings

At the end of June 30, 2026. Change is in shares since the quarter before.2

StockValueShare of portfolioChange
ACWIIshares Tr$197.7M54.8%−41.5%
KRMNKarman Hldgs Inc$78.0M21.6%
RVMDRevolution Medicines Inc$64.4M17.8%
TNGXTango Therapeutics Inc$11.1M3.1%
MAZEMaze Therapeutics Inc$7.2M2.0%
MDLNMedline Inc$2.7M0.7%−2.8%

Best picks still held

How each current holding has done since the quarter it first appeared in its filings (up to six years back).

StockHeld sinceReturn sinceNow worth
TNGXTango Therapeutics IncDecember 31, 2025+252.8%$11.1M
RVMDRevolution Medicines IncDecember 31, 2025+135.1%$64.4M
ACWIIshares TrDecember 31, 2025+10.9%$197.7M
MDLNMedline IncDecember 31, 2025−6.1%$2.7M
MAZEMaze Therapeutics IncDecember 31, 2025−28.0%$7.2M
KRMNKarman Hldgs IncDecember 31, 2025−31.8%$78.0M

Quarter by quarter

QuarterIts picksS&P 500
June 30, 2026+5.8%+14.8%
March 31, 2026+0.4%−4.6%
December 31, 2024−7.7%+2.1%
September 30, 2024+7.3%+5.4%
June 30, 2024−9.5%+4.0%
March 31, 2024+38.2%+10.0%
September 30, 2023−3.6%−3.6%
June 30, 2023+5.6%+8.3%
March 31, 2023+7.9%+7.0%
December 31, 2022+2.3%+7.1%
September 30, 2022−4.1%−5.3%
June 30, 2022−12.1%−16.5%
March 31, 2022−7.6%−4.9%
December 31, 2021+6.2%+10.7%
September 30, 2021−1.2%+0.3%

Sources

Every number on this page points here. Each one links to the public record.

  1. 1
    CIK 1678378
  2. 2
    Filed August 7, 2026 · accession 0001214659-26-009752