Mass General Brigham, Inc
In its 13F for Q1 2026 (holdings as of March 31, 2026, filed May 5, 2026), Mass General Brigham, Inc reported 6 stock positions worth $468.9 million. Its top holding was iShares MSCI Acwi ETF (ACWI) at 62.4% of the portfolio, followed by Karman (KRMN, 26.7%) and Revolution Medicines (RVMD, 7.1%). Compared with Q4 2025, it sold out of 1, added to 1 and reduced 1. The biggest buy was Medline Class A (MDLN, shares +168%) and the biggest sale iShares MSCI Acwi ETF (ACWI, shares −53%).
- Most Recent 13F
- Q2 2026
- Location
- SOMERVILLE, MA
- CIK
- 0001678378
- Portfolio Value
- $468.9M (Q1 2026)
- SEC Filing
- 0001214659-26-005558 ↗ filed May 5, 2026
Holdings Value
Holdings 6 stocks · $468.9M
| ACWI iShares MSCI Acwi ETF | 62.42% | 2,153,477 | $292.7M | Reduce -53.3% |
| KRMN Karman Holdings Inc. | 26.67% | 1,562,054 | $125.0M | No change |
| RVMD Revolution Medicines Inc. | 7.14% | 344,091 | $33.5M | No change |
| TNGX Tango Therapeutics Inc. | 1.58% | 354,192 | $7.4M | No change |
| MAZE Maze Therapeutics Inc. | 1.53% | 239,994 | $7.2M | No change |
| MDLN Medline Inc. Class A | 0.67% | 70,357 | $3.1M | Add +167.6% |
Portfolio Sells Q4 2025 → Q1 2026
Portfolio Buys Q4 2025 → Q1 2026
| MDLN Medline Inc. Class A | Add +167.6% | 0.67% | +0.53 |
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 6 | $361.1M | ACWI, KRMN, RVMD, TNGX, MAZE |
| Q1 2026 | 6 | $468.9M | ACWI, KRMN, RVMD, TNGX, MAZE |
| Q4 2025 | 7 | $809.8M | ACWI, KRMN, RVMD, MAZE, TNGX |
| Q3 2024 | 5 | $43.6M | IOT, RVMD, PLRX, TNGX, FULC |
| Q2 2024 | 4 | $20.5M | RVMD, PLRX, TNGX, FULC |
| Q1 2024 | 5 | $57.1M | COIN, RVMD, PLRX, TNGX, FULC |