Mass General Brigham, Inc

In its 13F for Q3 2024 (holdings as of September 30, 2024, filed October 16, 2024), Mass General Brigham, Inc reported 5 stock positions worth $43.6 million. Its top holding was Samsara Class A (IOT) at 49.5% of the portfolio, followed by Revolution Medicines (RVMD, 35.2%) and Pliant Therapeutics (PLRX, 7.4%). Compared with Q2 2024, it opened 1 new position. The biggest buy was a new position in Samsara Class A (IOT).

Most Recent 13F
Q2 2026
Location
SOMERVILLE, MA
CIK
0001678378
Portfolio Value
$43.6M (Q3 2024)
SEC Filing
0001678378-24-000006 ↗ filed Oct 16, 2024

Holdings Value

0$200.0M$400.0M$600.0M$800.0M$1.0B Q1 2024: $57.1M Q1 2024 Q2 2024: $20.5M Q2 2024 Q3 2024: $43.6M $43.6M Q3 2024 Q4 2025: $809.8M Q4 2025 Q1 2026: $468.9M Q1 2026 Q2 2026: $361.1M Q2 2026

Holdings 5 stocks · $43.6M
IOT Samsara Inc. Class A 49.50% 448,753 $21.6M New
RVMD Revolution Medicines Inc. 35.15% 338,191 $15.3M No change
PLRX Pliant Therapeutics Inc. 7.42% 288,690 $3.2M No change
TNGX Tango Therapeutics Inc. 6.25% 354,192 $2.7M No change
FULC Fulcrum Therapeutics Inc. 1.68% 205,356 $733K No change

Portfolio Sells Q2 2024 → Q3 2024
None this quarter.

Portfolio Buys Q2 2024 → Q3 2024
IOT Samsara Inc. Class A New 49.50% +49.50

All Filings

QuarterPositions13F Reported ValueTop Holdings
Q2 2026 6$361.1MACWI, KRMN, RVMD, TNGX, MAZE
Q1 2026 6$468.9MACWI, KRMN, RVMD, TNGX, MAZE
Q4 2025 7$809.8MACWI, KRMN, RVMD, MAZE, TNGX
Q3 2024 5$43.6MIOT, RVMD, PLRX, TNGX, FULC
Q2 2024 4$20.5MRVMD, PLRX, TNGX, FULC
Q1 2024 5$57.1MCOIN, RVMD, PLRX, TNGX, FULC