Mass General Brigham
Mass General Brigham reported 6 stocks worth $361M in its 13F filing for Q2 2026, filed Aug 7, 2026. Its largest holdings are ACWI (54.8%), KRMN (21.6%) and RVMD (17.9%). Compared with Q1 2026, the fund trimmed ACWI and MDLN.
Holdings
| # | Stock | Value | Weight | Shares | Change | Shares, 4 qtrs | Held |
|---|---|---|---|---|---|---|---|
| 1 |  ACWI Ishares TR | $198M | 54.8% | 1.3M | −894K (−42%) | 3 of 4 | |
| 2 |  KRMN Karman Hldgs Inc | $78M | 21.6% | 1.6M | No change | 3 of 4 | |
| 3 |  RVMD Revolution Medicines Inc | $64.4M | 17.9% | 344K | No change | 4 of 4 | |
| 4 |  TNGX Tango Therapeutics Inc | $11.1M | 3.1% | 354K | No change | 4 of 4 | |
| 5 |  MAZE Maze Therapeutics Inc | $7.2M | 2.0% | 240K | No change | 3 of 4 | |
| 6 |  MDLN Medline Inc | $2.7M | 0.8% | 68K | −1,944 (−3%) | 3 of 4 |
Positions at Jun 30, 2026, as reported. Change is against the fund's Q1 2026 filing; weight is the share of the fund's reported stocks.
Reported value
last 4 quartersThe value of the US stocks the fund reported, at quarter end prices. It moves with the market as well as with buying and selling.
Filings for Q2 2026
straight from the SEC| Filed | Form | Quarter | |
|---|---|---|---|
| Aug 7, 2026 | 13F-HR | Q2 2026 | SEC filing ↗ |
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All hedge fund holdings →Mass General Brigham 13F FAQ
What does Mass General Brigham own?
Mass General Brigham reported 6 stocks worth $361M in its 13F filing for Q2 2026, filed Aug 7, 2026. Its largest holdings are ACWI (54.8%), KRMN (21.6%) and RVMD (17.9%). The table above lists every position in the filing (the top 10 without an account).
What did Mass General Brigham buy and sell in Q2 2026?
Compared with Q1 2026: 0 new positions, 0 added to, 2 trimmed and 0 sold out.
When will Mass General Brigham file its next 13F?
Holdings as of Sep 30, 2026 are due by Nov 16, 2026. The filing appears on this page within minutes of reaching the SEC.
How much is Mass General Brigham's portfolio worth?
The Q2 2026 filing reports $361M in US stocks. That leaves out cash, bonds, short positions and most foreign holdings, so the fund's total assets are usually larger.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Holdings come from the fund's SEC Form 13F filings as reported and show positions at the end of the quarter, up to 45 days before the filing. The fund may have changed its positions since. A 13F leaves out short positions, cash, bonds and most foreign holdings. See all hedge fund holdings.