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MGB

Mass General Brigham Portfolio holdings

AUM $361M
This Fund
S&P 500
This Quarter Est. Return
+4.47%
1 Year Est. Return
–
3 Year Est. Return
–
5 Year Est. Return
–
10 Year Est. Return
–
AUM
$469M
AUM Growth
-$341M
Cap. Flow
-$353M
Cap. Flow %
-75.24%
Top 10 Hldgs %
100%
Holding
7
New
–
Increased
1
Reduced
1
Closed
1

Top Buys

Rank Stock Value
1
MDLN
Medline Inc
MDLN
+$1.95M

Top Sells

Rank Stock Value
1
ACWI icon
iShares MSCI ACWI ETF
ACWI
+$354M
2
RBRK icon
Rubrik
RBRK
+$1.07M

Sector Composition

Rank Sector Weight
1 Industrials 26.67%
2 Healthcare 10.91%
3 Technology 0%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ACWI icon
1
iShares MSCI ACWI ETF
ACWI
$33.5B
$293M 62.42%
2,153,477
-2,460,478
-53% -$354M
KRMN
2
Karman Holdings
KRMN
$7.72B
$125M 26.67%
1,562,054
– –
RVMD icon
3
Revolution Medicines
RVMD
$44B
$33.5M 7.14%
344,091
– –
TNGX icon
4
Tango Therapeutics
TNGX
$4.41B
$7.41M 1.58%
354,192
– –
MAZE
5
Maze Therapeutics
MAZE
$1.59B
$7.16M 1.53%
239,994
– –
MDLN
6
Medline Inc
MDLN
$30.9B
$3.13M 0.67%
70,357
+44,063
+168% +$1.95M
RBRK icon
7
Rubrik
RBRK
$18.5B
– –
-14,000
Closed -$1.07M

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PPG
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PWC
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MCM
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SWM
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A6
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Mass General Brigham's Q1 2026 Portfolio in Review

As of Q1 2026, Mass General Brigham held 7 positions worth $469M, down 42% from $810M the previous quarter. Its ten largest holdings account for 100% of the portfolio.

Mass General Brigham withdrew a net $353M in Q1 2026, closing 1 position and reducing 1 holding. Its most notable exit was Rubrik, an estimated $1.07M position sold in full.

By sector, the portfolio is most concentrated in Industrials at 27% of assets, up from 14% a quarter earlier, followed by Healthcare and Technology.

Against the trend, Mass General Brigham added an estimated $1.95M to Medline Inc.

  • Mass General Brigham added most to Medline Inc in Q1 2026, an estimated $1.95M increase.
  • Mass General Brigham's biggest Q1 2026 reduction was iShares MSCI ACWI ETF, cutting an estimated $354M.
  • Mass General Brigham fully exited Rubrik in Q1 2026, selling an estimated $1.07M.
  • Mass General Brigham's ten largest holdings make up 100% of its $469M portfolio in Q1 2026.
  • Mass General Brigham opened 0 new positions and closed 1 in Q1 2026.
  • Mass General Brigham's portfolio value fell 42% quarter-over-quarter to $469M.

Based on Mass General Brigham's 13F filing for Q1 2026, filed 5 May 2026.