Funds › Mass General Brigham, Inc
Mass General Brigham, Inc
13F for Q3 2026, filed Nov 3, 2026. 9 positions worth $456.3M.Managers with more than $100 million in US-listed stocks list their holdings each quarter, within 45 days of quarter end. Long positions only: no short sales or cash.
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Holdings, Q3 2026
Largest first. Common shares only.
| # | The fund's own figures at the end of the quarter. A report can be up to 45 days old when it is filed. Options and bonds are not counted here. | Filing | ||||
|---|---|---|---|---|---|---|
| 1 | Vanguard International Equity Index F Tt Wrld St Etf | 1.90M | $300.5M | 65.8% | New | 13F ↗ |
| 2 | RVMD Revolution Medicines, Inc. | 344,091 | $70.6M | 15.5% | Unchanged | 13F ↗ |
| 3 | SPCX Space Exploration Technologies Corp. | 234,140 | $35.3M | 7.7% | New | 13F ↗ |
| 4 | LYNX Lyntris Inc. | 1.92M | $23.6M | 5.2% | New | 13F ↗ |
| 5 | TNGX Tango Therapeutics, Inc. | 354,192 | $8.8M | 1.9% | Unchanged | 13F ↗ |
| 6 | MAZE Maze Therapeutics, Inc. | 249,636 | $6.8M | 1.5% | +4.0% | 13F ↗ |
| 7 | KRMN Karman Holdings Inc. | 209,261 | $6.8M | 1.5% | -86.6% | 13F ↗ |
| 8 | MDLN Medline Inc. | 68,413 | $2.4M | 0.5% | Unchanged | 13F ↗ |
| 9 | IOT Samsara Inc. | 39,772 | $1.5M | 0.3% | New | 13F ↗ |
Changes since Q2 2026
4 new, 1 added to, 1 trimmed, 1 exited, 3 unchanged. By estimated dollars.
New positions (4)
Added to (1)
| Position | Shares | Change | Est. dollars |
|---|---|---|---|
| MAZE Maze Therapeutics, Inc. | 249,636 | +4.0% | $262.1K |
Trimmed (1)
| Position | Shares | Change | Est. dollars |
|---|---|---|---|
| KRMN Karman Holdings Inc. | 209,261 | -86.6% | -$43.9M |
Exited (1)
| Position | Shares | Change | Est. dollars |
|---|---|---|---|
| iShares Tr Msci Acwi Etf | 1.26M | Exited | -$197.7M |
The 10 largest of each, by estimated dollars: shares changed times the later report's price. Index tracking, splits and mergers move positions too.
Compare two quarters
Pick any two quarters: what is new, added to, trimmed or exited. Premium plan.
Reported value by quarter
Value and number of positions at the end of each quarter.
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Largest positions in earlier quarters
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Ten largest positions
By value, Q3 2026.
Filings
Most recent first, up to 80. An amendment can replace a report or add holdings to it. All 13F filings
Information, not investment advice. Values are the fund's own figures at quarter end; a report can be up to 45 days old when filed. Disclaimer