Altarock Partners LP
In its 13F for Q1 2026 (holdings as of March 31, 2026, filed May 15, 2026), Altarock Partners LP reported 8 stock positions worth $4.1 billion. Its top holding was Amazon.com (AMZN) at 38.2% of the portfolio, followed by Transdigm (TDG, 25.5%) and Microsoft (MSFT, 16.8%). Compared with Q4 2025, it added to 2 and reduced 6. The biggest buy was Amazon.com (AMZN, shares +3%) and the biggest sale Microsoft (MSFT, shares −10%).
- Most Recent 13F
- Q2 2026
- Location
- WEST PALM BEACH, FL
- CIK
- 0001631014
- Portfolio Value
- $4.1B (Q1 2026)
- SEC Filing
- 0001104659-26-062170 ↗ filed May 15, 2026
Holdings Value
Holdings 8 stocks · $4.1B
| AMZN Amazon.com Inc. | 38.20% | 7,567,946 | $1.6B | Add +3.5% |
| TDG Transdigm Group Inc. | 25.54% | 909,168 | $1.1B | Reduce -6.2% |
| MSFT Microsoft Corp. | 16.75% | 1,867,537 | $691.3M | Reduce -10.3% |
| MCO Moody's Corp. | 9.11% | 862,036 | $376.1M | Add +5.8% |
| MA Mastercard Inc. Class A | 6.33% | 522,836 | $261.2M | Reduce -3.5% |
| V Visa Inc. Class A | 3.65% | 498,677 | $150.7M | Reduce -3.5% |
| GOOGL Alphabet Inc. Class A | 0.30% | 43,391 | $12.5M | Reduce -74.4% |
| HLT Hilton Worldwide Holdings Inc. | 0.11% | 15,341 | $4.7M | Reduce -97.2% |
Portfolio Sells Q4 2025 → Q1 2026
| MSFT Microsoft Corp. | Reduce -10.3% | 16.75% | −2.99 |
| HLT Hilton Worldwide Holdings Inc. | Reduce -97.2% | 0.11% | −2.94 |
| GOOGL Alphabet Inc. Class A | Reduce -74.4% | 0.30% | −0.74 |
| V Visa Inc. Class A | Reduce -3.5% | 3.65% | +0.10 |
| TDG Transdigm Group Inc. | Reduce -6.2% | 25.54% | +0.26 |
| MA Mastercard Inc. Class A | Reduce -3.5% | 6.33% | +0.27 |
Portfolio Buys Q4 2025 → Q1 2026
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 8 | $4.2B | AMZN, TDG, MSFT, MA, V |
| Q1 2026 | 8 | $4.1B | AMZN, TDG, MSFT, MCO, MA |
| Q4 2025 | 8 | $5.1B | AMZN, TDG, MSFT, MCO, MA |
| Q3 2025 | 9 | $5.5B | AMZN, MSFT, TDG, MCO, MA |
| Q2 2025 | 9 | $5.5B | TDG, AMZN, MSFT, MCO, MA |
| Q1 2025 | 9 | $5.0B | TDG, AMZN, MSFT, GOOGL, MCO |
| Q4 2024 | 10 | $4.9B | TDG, AMZN, MSFT, GOOGL, MCO |
| Q3 2024 | 9 | $5.1B | TDG, AMZN, MSFT, GOOGL, MCO |
| Q2 2024 | 9 | $4.9B | TDG, MSFT, AMZN, GOOGL, V |
| Q1 2024Amended | 8 | $4.7B | TDG, AMZN, MSFT, GOOGL, V |