ALTAROCK PARTNERS LP — 13F Holdings & Portfolio
CIK 1631014 · latest 13F-HR filed 2026-05-15
ALTAROCK PARTNERS LP manages $4.13B in 13F-reported U.S. long-equity assets across 8 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are AMZN (38.20%), TDG (25.54%), MSFT (16.75%). Quarter over quarter (versus its 2025-12-31 filing) the fund opened 0 new positions, exited 0, added to 0, and trimmed 8.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
$4.13B
Long-equity book
8
Distinct positions
2026-03-31
Filed 2026-05-15
+0 / −0 / ↑0 / ↓8
vs 2025-12-31
| Name | Title / Status | Ownership | Type |
|---|
Top Trims
- MICROSOFT CORP-$315.8M -31.4%
- TRANSDIGM GROUP INC-$235.5M -18.3%
- HILTON WORLDWIDE-$151.2M -97.0%
- AMAZON.COM INC-$112.2M -6.6%
- MASTERCARD INC-CLASS A-$48.1M -15.5%
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | AMAZON.COM INC | AMZN | 023135106 | $1.58B | 38.20% | 7,567,946 | SH |
| 2 | TRANSDIGM GROUP INC | TDG | 893641100 | $1.05B | 25.54% | 909,168 | SH |
| 3 | MICROSOFT CORP | MSFT | 594918104 | $691.3M | 16.75% | 1,867,537 | SH |
| 4 | MOODYS CORP | MCO | 615369105 | $376.1M | 9.11% | 862,036 | SH |
| 5 | MASTERCARD INC-CLASS A | MA | 57636Q104 | $261.2M | 6.33% | 522,836 | SH |
| 6 | VISA INC-CLASS A SHRS | V | 92826C839 | $150.7M | 3.65% | 498,677 | SH |
| 7 | ALPHABET INC-CL A | GOOGL | 02079K305 | $12.5M | 0.30% | 43,391 | SH |
| 8 | HILTON WORLDWIDE | HLT | 43300A203 | $4.7M | 0.11% | 15,341 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-03-31 | 2026-05-15 | $4.13B | 8 | 0001104659-26-062170 |
| 2025-12-31 | 2026-02-13 | $5.10B | 8 | 0001104659-26-015359 |
| 2025-09-30 | 2025-11-14 | $5.47B | 9 | 0001104659-25-112002 |