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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
Avg Time Held
3.3 quarters
Top 10 Avg Time Held
2 quarters
Top 20 Avg Time Held
2 quarters

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 Miscellaneous 62.42%
2 Industrials 26.67%
3 Healthcare 10.91%
4 Technology 0%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow Held Since
ACWI icon
1
iShares MSCI ACWI ETF
ACWI
$33.1B
$293M 62.42%
2,153,477
-2,460,478
-53% -$354M
2025 Q4
1 quarter
KRMN
2
Karman Holdings
KRMN
$4.52B
$125M 26.67%
1,562,054
– –
2025 Q4
1 quarter
RVMD icon
3
Revolution Medicines
RVMD
$44.3B
$33.5M 7.14%
344,091
– –
2024 Q1
8 quarters
TNGX icon
4
Tango Therapeutics
TNGX
$3.92B
$7.41M 1.58%
354,192
– –
2024 Q1
8 quarters
MAZE
5
Maze Therapeutics
MAZE
$1.47B
$7.16M 1.53%
239,994
– –
2025 Q4
1 quarter
MDLN
6
Medline Inc
MDLN
$31.2B
$3.13M 0.67%
70,357
+44,063
+168% +$1.95M
2025 Q4
1 quarter
RBRK icon
7
Rubrik
RBRK
$24.6B
– –
-14,000
Closed -$1.07M –

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SFS
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DFG
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PCM
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FPM
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LKIM
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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 Miscellaneous at 62% of assets, down from 81% a quarter earlier, followed by Industrials and Healthcare.

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.