Altarock Partners (Mark Massey) latest 13F portfolio: 8 holdings worth $4.1B as of Q1 2026.
Backtested since 2020: mirroring Altarock Partners's reported 13F equity holdings each quarter would have returned +183.4% versus +194.6%for the S&P 500 (+18.2% annualized). See the Performance tab for the full equity curve.
Investor: Mark Massey
Number of Assets: 8
Reporting Period: Q1 - 2026
Holdings at Report: $4,126,337,614
Return $ Since Report: +$908,117,991
Return % Since Report: +22.01%
Company | Position | Activity | Shares | Port. % | Rep. Price | Curr. Price | Rep. Value | Curr. Value | Return Value | Return % |
|---|---|---|---|---|---|---|---|---|---|---|
| Alphabet Inc. (GOOGL) | Equity | -74.38% | 43,391 | 0.30% | $287.56 | $362.43 | $12,477,516 | $15,726,200 | +$3,248,684 | +26.04% |
| Amazon.com Inc. (AMZN) | Equity | +3.46% | 7,567,946 | 38.20% | $208.27 | $272.65 | $1,576,176,113 | $2,063,400,477 | +$487,224,364 | +30.91% |
| Moody's Corp. (MCO) | Equity | +5.84% | 862,036 | 9.11% | $436.25 | $483.98 | $376,063,205 | $417,208,183 | +$41,144,978 | +10.94% |
| Hilton Worldwide Holdings Inc. (HLT) | Equity | -97.17% | 15,341 | 0.11% | $304.08 | $324.56 | $4,664,891 | $4,979,075 | +$314,184 | +6.74% |
| Mastercard Inc. (MA) | Equity | -3.51% | 522,836 | 6.33% | $499.66 | $570.48 | $261,240,236 | $298,267,481 | +$37,027,245 | +14.17% |
| Microsoft Corp. (MSFT) | Equity | -10.32% | 1,867,537 | 16.75% | $370.17 | $487.46 | $691,306,171 | $910,349,586 | +$219,043,415 | +31.69% |
| Transdigm Group Inc. (TDG) | Equity | -6.21% | 909,168 | 25.54% | $1,158.96 | $1,254.71 | $1,053,689,345 | $1,140,742,181 | +$87,052,836 | +8.26% |
| Visa Inc. (V) | Equity | -3.48% | 498,677 | 3.65% | $302.24 | $368.54 | $150,720,137 | $183,782,422 | +$33,062,285 | +21.94% |