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AltaRock Partners
Mark Massey founded AltaRock Partners and is described in public profiles as its chief investment officer. The firm keeps an ultra-concentrated quality portfolio, with very few businesses making up the book. Detailed interviews with him are scarce, so this does not go beyond that concentration and his role at the filer.
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Portfolio value
$4.24B
Number of holdings
8
Report date
Jun 30, 2026
Filing date
Aug 17, 2026
Shares
5,729,972
Value
$1.37B
Weight
32.21%
Shares
875,755
Value
$1.17B
Weight
27.51%
Shares
2,334,482
Value
$871M
Weight
20.54%
Shares
764,507
Value
$393M
Weight
9.26%
Shares
836,470
Value
$287M
Weight
6.77%
Shares
302,624
Value
$137M
Weight
3.23%
Shares
41,994
Value
$15M
Weight
0.35%
Shares
15,202
Value
$5M
Weight
0.12%
| Name | Symbol | Shares | Value | Weight |
|---|---|---|---|---|
| AMZN | 5,729,972 | $1.37B | 32.21% | |
| TDG | 875,755 | $1.17B | 27.51% | |
The filing did not confirm the value unit. Figures treat reported values as dollars.
Figures and reports come from a third-party data provider. Chartloom cannot confirm that they are complete, current, or accurate.
| 2,334,482 |
| $871M |
| 20.54% |
| MA | 764,507 | $393M | 9.26% |
| V | 836,470 | $287M | 6.77% |
| MCO | 302,624 | $137M | 3.23% |
| GOOGL | 41,994 | $15M | 0.35% |
| HLT | 15,202 | $5M | 0.12% |