Mark Massey – AltaRock Partners Portfolio Activity & Recent Trades (Dec 31, 2025)
As of Dec 31, 2025, the AltaRock Partners portfolio activity showed several notable changes in holdings, according to the latest SEC 13F filing reported on Feb 13, 2026. The activity included new positions, additions to existing holdings, reductions, and complete exits, providing a clear view of how the portfolio evolved during the quarter.
During Q4 2025, the filing reported:
New Buys –
None reported
Increases –
None reported
Reductions – Amazon.com, Inc., Alphabet Inc., Mastercard Incorporated, Moody's Corporation, Microsoft Corporation, and 2 more
Complete Exits – Fair Isaac Corporation
These updates highlight how the portfolio adjusted across different sectors and market conditions, offering insights into allocation shifts and investment trends.
| Date | Symbol | Name | Type | Change Qty | % Change | Value | Remaining |
|---|---|---|---|---|---|---|---|
Q4 2025 | AMZN Amazon.com, Inc. | Amazon.com, Inc. | Sell | -243,719 | -3.2% | $1.69B | 7,314,534 |
Q4 2025 | FICO Fair Isaac Corporation | Fair Isaac Corporation | Sell - Position Exit | -667 | -100.0% | $0.00 | - |
Q4 2025 | GOOGL Alphabet Inc. | Alphabet Inc. | Sell | -175,000 | -50.8% | $53.02M | 169,391 |
Q4 2025 | MA Mastercard Incorporated | Mastercard Incorporated | Sell | -42,250 | -7.2% | $309.32M | 541,836 |
Q4 2025 | MCO Moody's Corporation | Moody's Corporation | Sell | -134,232 | -14.1% | $416.09M | 814,503 |
Q4 2025 | MSFT Microsoft Corporation | Microsoft Corporation | Sell | -486,910 | -19.0% | $1.01B | 2,082,357 |
Q4 2025 | TDG Transdigm Group Incorporated | Transdigm Group Incorporated | Sell | -6,992 | -0.7% | $1.29B | 969,400 |
Q4 2025 | V Visa Inc. | Visa Inc. | Sell | -16,845 | -3.2% | $181.20M | 516,677 |
Q3 2025 | AMZN Amazon.com, Inc. | Amazon.com, Inc. | Buy | +1,282,347 | +20.4% | $1.66B | 7,558,253 |
Q3 2025 | FICO Fair Isaac Corporation | Fair Isaac Corporation | Sell | -3 | -0.4% | $998.19K | 667 |
Q3 2025 | GOOGL Alphabet Inc. | Alphabet Inc. | Sell | -701,038 | -67.1% | $83.72M | 344,391 |
Q3 2025 | HLT Hilton Worldwide Holdings Inc. | Hilton Worldwide Holdings Inc. | Sell | -1,983 | -0.4% | $140.78M | 542,613 |
Q3 2025 | MA Mastercard Incorporated | Mastercard Incorporated | Sell | -2,168 | -0.4% | $332.23M | 584,086 |
Q3 2025 | MCO Moody's Corporation | Moody's Corporation | Sell | -3,519 | -0.4% | $452.05M | 948,735 |
Q3 2025 | MSFT Microsoft Corporation | Microsoft Corporation | Sell | -9,382 | -0.4% | $1.33B | 2,569,267 |
Q3 2025 | TDG Transdigm Group Incorporated | Transdigm Group Incorporated | Sell | -3,558 | -0.4% | $1.29B | 976,392 |
Q3 2025 | V Visa Inc. | Visa Inc. | Sell | -1,890 | -0.4% | $182.13M | 533,522 |
Q2 2025 | AMZN Amazon.com, Inc. | Amazon.com, Inc. | Buy | +1,073,491 | +20.6% | $1.38B | 6,275,906 |
Q2 2025 | GOOGL Alphabet Inc. | Alphabet Inc. | Sell | -2,408,938 | -69.7% | $184.24M | 1,045,429 |
Q2 2025 | HLT Hilton Worldwide Holdings Inc. | Hilton Worldwide Holdings Inc. | Buy | +270,639 | +98.8% | $145.05M | 544,596 |
Q2 2025 | MCO Moody's Corporation | Moody's Corporation | Buy | +1,349 | +0.1% | $477.64M | 952,254 |
Q2 2025 | V Visa Inc. | Visa Inc. | Sell | -315,000 | -37.0% | $190.10M | 535,412 |
Q1 2025 | AMZN Amazon.com, Inc. | Amazon.com, Inc. | Sell | -75,905 | -1.4% | $989.81M | 5,202,415 |
Q1 2025 | CHTR Charter Communications, Inc. | Charter Communications, Inc. | Sell - Position Exit | -6,025 | -100.0% | $0.00 | - |
Q1 2025 | GOOGL Alphabet Inc. | Alphabet Inc. | Sell | -26,434 | -0.8% | $534.18M | 3,454,367 |
Q1 2025 | HLT Hilton Worldwide Holdings Inc. | Hilton Worldwide Holdings Inc. | Buy | +182,629 | +200.0% | $62.34M | 273,957 |
Q1 2025 | MSFT Microsoft Corporation | Microsoft Corporation | Buy | +687,008 | +36.3% | $968.00M | 2,578,649 |
Q1 2025 | TDG Transdigm Group Incorporated | Transdigm Group Incorporated | Sell | -20,654 | -2.1% | $1.36B | 979,950 |
Q1 2025 | V Visa Inc. | Visa Inc. | Sell | -24,500 | -2.8% | $298.04M | 850,412 |
Q4 2024 | AMZN Amazon.com, Inc. | Amazon.com, Inc. | Sell | -124,000 | -2.3% | $1.16B | 5,278,320 |