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MGB

Mass General Brigham Portfolio holdings

AUM $361M
This Fund
S&P 500
This Quarter Est. Return
+5.22%
1 Year Est. Return
–
3 Year Est. Return
–
5 Year Est. Return
–
10 Year Est. Return
–
AUM
$810M
AUM Growth
–
Cap. Flow
+$797M
Cap. Flow %
98.38%
Top 10 Hldgs %
100%
Holding
7
New
7
Increased
–
Reduced
–
Closed
–

Top Buys

Rank Stock Value
1
ACWI icon
iShares MSCI ACWI ETF
ACWI
+$648M
2
KRMN
Karman Holdings
KRMN
+$113M
3
RVMD icon
Revolution Medicines
RVMD
+$22.6M
4
MAZE
Maze Therapeutics
MAZE
+$8.25M
5
TNGX icon
Tango Therapeutics
TNGX
+$3.05M

Top Sells

No sells this quarter

Sector Composition

Rank Sector Weight
1 Industrials 14.11%
2 Healthcare 5.14%
3 Technology 0.13%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ACWI icon
1
iShares MSCI ACWI ETF
ACWI
$33.4B
$653M 80.62%
+4,613,955
New +$648M
KRMN
2
Karman Holdings
KRMN
$8.21B
$114M 14.11%
+1,562,054
New +$113M
RVMD icon
3
Revolution Medicines
RVMD
$44B
$27.4M 3.38%
+344,091
New +$22.6M
MAZE
4
Maze Therapeutics
MAZE
$1.52B
$9.94M 1.23%
+239,994
New +$8.25M
TNGX icon
5
Tango Therapeutics
TNGX
$4.31B
$3.14M 0.39%
+354,192
New +$3.05M
MDLN
6
Medline Inc
MDLN
$31.1B
$1.1M 0.14%
+26,294
New +$1.11M
RBRK icon
7
Rubrik
RBRK
$19.9B
$1.07M 0.13%
+14,000
New +$1.07M

Similar funds

PI
Pennant Investors Summit, New Jersey $361M AUM 134.26% 1-Year Est. Return
PWC
PYA Waltman Capital Knoxville, Tennessee $361M AUM 9.49% 1-Year Est. Return
MCM
Monimus Capital Management Woodbridge, New Jersey $361M AUM 21.17% 1-Year Est. Return
RA
RR Advisors Dallas, Texas $360M AUM 28.52% 1-Year Est. Return
A6
Anchor @ 65 Singapore $362M AUM 20.02% 1-Year Est. Return
WTFG
Wood Tarver Financial Group Boise, Idaho $362M AUM 14.75% 1-Year Est. Return
5VM
5AM Venture Management San Francisco, California $360M AUM 345.76% 1-Year Est. Return
SIAG
Safeguard Investment Advisory Group Corona, California $362M AUM 20.96% 1-Year Est. Return

Mass General Brigham's Q4 2025 Portfolio in Review

As of Q4 2025, Mass General Brigham held 7 positions worth $810M. Its ten largest holdings account for 100% of the portfolio.

Mass General Brigham deployed $797M of net new capital in Q4 2025, opening 7 new positions. Its largest new stake was iShares MSCI ACWI ETF: 4,613,955 shares worth $653M.

By sector, the portfolio is most concentrated in Industrials at 14% of assets, followed by Healthcare and Technology.

  • Mass General Brigham's largest Q4 2025 buy was iShares MSCI ACWI ETF: 4,613,955 shares worth $653M.
  • Mass General Brigham's ten largest holdings make up 100% of its $810M portfolio in Q4 2025.
  • Mass General Brigham opened 7 new positions and closed 0 in Q4 2025.

Based on Mass General Brigham's 13F filing for Q4 2025, filed 27 Jan 2026.