Mass General Brigham, Inc reported 5 positions worth $163.35M for the quarter ended Jun 30, 2026, down 7.3% on the prior quarter. It opened 0 new positions, added to 0, trimmed 1 and exited 0. Its largest holding is Karman Holdings Inc. at 47.7% of the portfolio.
Reported 13F market value at each quarter end. A change mixes trading with price moves in the positions held.
Dollar value of shares bought and sold each quarter, at that quarter’s price. It counts trading only, not price changes.
How many positions were opened, added to, trimmed or closed each quarter.
Share of reported value in each sector at every quarter end.
No positions were added to this quarter.
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| MDLN Medline Inc. | -1,944 | -2.8% | $76.67K | 1.65% |
No new positions this quarter.
No positions were closed this quarter.
| # | Activity | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | KRMN Karman Holdings Inc. | Industrials | 1.56M | $77.98M | 47.74% | 0 | 0.0% | Unchanged | 1.18% |
| 2 | RVMD Revolution Medicines, Inc. | Healthcare | 344.1K | $64.44M | 39.45% | 0 | 0.0% | Unchanged | 0.16% |
| 3 | TNGX Tango Therapeutics, Inc. | Healthcare | 354.2K | $11.07M | 6.78% | 0 | 0.0% | Unchanged | 0.21% |
| 4 | MAZE Maze Therapeutics, Inc. | Healthcare | 240.0K | $7.16M | 4.38% | 0 | 0.0% | Unchanged | 0.41% |
| 5 | MDLN Medline Inc. | Healthcare | 68.4K | $2.70M | 1.65% | -1,944 | -2.8% | Reduced | 0.01% |
Tip. Select a row to see that position’s full history at Mass General Brigham.
As of its Q2 2026 13F filing, Mass General Brigham, Inc’s five largest positions were Karman Holdings Inc. (KRMN) at 47.7%, Revolution Medicines, Inc. (RVMD) at 39.5%, Tango Therapeutics, Inc. (TNGX) at 6.8%, Maze Therapeutics, Inc. (MAZE) at 4.4%, Medline Inc. (MDLN) at 1.7% of the reported portfolio.
Mass General Brigham, Inc reported a 13F portfolio worth $163.35M across 5 positions for Q2 2026. That is down 7.3% from the previous quarter.
Its largest sales by value were Medline Inc. ($76.67K). It exited 0 positions entirely.
From the Form 13F-HR reports Mass General Brigham, Inc files with the SEC each quarter, within 45 days of quarter end. A 13F lists long positions in US-listed equities and options; it excludes short positions, cash, bonds and most non-US holdings.
13F data reflects long positions in US-listed equities and options as reported to the SEC up to 45 days after quarter end. It excludes short positions, cash, bonds and most non-US securities, so it is not a complete picture of a manager’s assets.