Altarock Partners (Mark Massey) latest 13F portfolio: 8 holdings worth $4.2B as of Q2 2026.
Backtested since 2020: mirroring Altarock Partners's reported 13F equity holdings each quarter would have returned +166.6% versus +192.2%for the S&P 500 (+16.7% annualized). See the Performance tab for the full equity curve.
Investor: Mark Massey
Number of Assets: 8
Reporting Period: Q2 - 2026
Holdings at Report: $4,239,761,490
Return $ Since Report: +$219,150,289
Return % Since Report: +5.17%
Company | Position | Activity | Shares | Port. % | Rep. Price | Curr. Price | Rep. Value | Curr. Value | Return Value | Return % |
|---|---|---|---|---|---|---|---|---|---|---|
| Alphabet Inc. (GOOGL) | Equity | -3.22% | 41,994 | 0.35% | $357.37 | $349.54 | $15,007,396 | $14,678,583 | -$328,813 | -2.19% |
| Amazon.com Inc. (AMZN) | Equity | -24.29% | 5,729,972 | 32.21% | $238.34 | $253.71 | $1,365,681,526 | $1,453,751,196 | +$88,069,670 | +6.45% |
| Hilton Worldwide Holdings Inc. (HLT) | Equity | -0.91% | 15,202 | 0.12% | $330.46 | $305.73 | $5,023,653 | $4,647,707 | -$375,946 | -7.48% |
| Mastercard Inc. (MA) | Equity | +46.22% | 764,507 | 9.26% | $513.60 | $565.24 | $392,650,795 | $432,129,937 | +$39,479,142 | +10.05% |
| Microsoft Corp. (MSFT) | Equity | +25.00% | 2,334,482 | 20.54% | $373.02 | $493.78 | $870,808,476 | $1,152,720,522 | +$281,912,046 | +32.37% |
| Moody's Corp. (MCO) | Equity | -64.89% | 302,624 | 3.23% | $452.92 | $468.59 | $137,064,462 | $141,806,580 | +$4,742,118 | +3.46% |
| Transdigm Group Inc. (TDG) | Equity | -3.68% | 875,755 | 27.51% | $1,332.04 | $1,086.05 | $1,166,540,690 | $951,113,718 | -$215,426,972 | -18.47% |
| Visa Inc. (V) | Equity | +67.74% | 836,470 | 6.77% | $343.09 | $368.29 | $286,984,492 | $308,063,536 | +$21,079,044 | +7.35% |