ALTAROCK PARTNERS LP
Long book
$4.13B
Q1 2026
Positions
8
Top-10 weight
100%
concentration
Last quarter
+13.9%
SPY +14.8%
Turnover
0%
of book per quarter
Strategy in plain words
auto-generated from filingsALTAROCK PARTNERS LP is a concentrated fundamental stock-picker, running a $4.13B US long book across 8 positions.
The portfolio is extremely concentrated — the top 10 positions are almost the whole book. The book barely moves quarter to quarter — a patient, low-turnover holder. Current anchor positions: AMAZON.COM INC, TRANSDIGM GROUP INC, MICROSOFT CORP, MOODY'S CORP, MASTERCARD INC - A.
Over the last 9 quarters its long book ran on average 1.6pp per quarter behind the S&P 500, beating the index in 4 of 9 quarters. We rate its filings highest-signal: new buys here are worth attention.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q1 2024
+6.0%
Q2 2024
+3.1%
Q3 2024
+4.3%
Q4 2024
-4.2%
Q1 2025
+14.8%
Q2 2025
-0.2%
Q3 2025
+1.7%
Q4 2025
-13.4%
Q1 2026
+13.9%
Sector allocation
Consumer discretionary 38%
Industrials 26%
Services media 19%
Technology 17%
Long book by quarter
What does ALTAROCK PARTNERS own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| AMZN AMAZON.COM INC | Consumer discretionary | 7.6M | $1.58B | 38.2% | +3.5% |
| TDG TRANSDIGM GROUP INC | Industrials | 909.2K | $1.05B | 25.5% | -6.2% |
| MSFT MICROSOFT CORP | Technology | 1.9M | $691.3M | 16.8% | -10.3% |
| MCO MOODY'S CORP | Services media | 862.0K | $376.1M | 9.1% | +5.8% |
| MA MASTERCARD INC - A | Services media | 522.8K | $261.2M | 6.3% | -3.5% |
| V VISA INC-CLASS A SHARES | Services media | 498.7K | $150.7M | 3.7% | -3.5% |
| GOOGL ALPHABET INC-CL A | Technology | 43.4K | $12.5M | 0.3% | -74.4% |
| HLT HILTON WORLDWIDE HOLDINGS IN | Services media | 15.3K | $4.7M | 0.1% | -97.2% |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | May 15, 2026 | 8 | $4.13B | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Feb 13, 2026 | 8 | $5.10B | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Nov 14, 2025 | 9 | $5.47B | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Aug 14, 2025 | 9 | $5.48B | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | May 14, 2025 | 9 | $4.97B | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Feb 14, 2025 | 10 | $4.94B | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Nov 13, 2024 | 9 | $5.08B | canonical | SEC ↗ |
| Q2 2024 | 13F-HR | Aug 14, 2024 | 9 | $4.86B | canonical | SEC ↗ |
| Q1 2024 | 13F-HR/ARESTATEMENT | May 21, 2024 | 8 | $4.65B | canonical | SEC ↗ |
| Q1 2024 | 13F-HR | May 15, 2024 | 8 | $4.65B | SEC ↗ |
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