Mark Massey – AltaRock Partners Portfolio Activity & Recent Trades (Sep 30, 2025)
As of Sep 30, 2025, the AltaRock Partners portfolio activity showed several notable changes in holdings, according to the latest SEC 13F filing reported on Nov 14, 2025. 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 Q3 2025, the filing reported:
New Buys –
None reported
Increases – Amazon.com, Inc.
Reductions – Fair Isaac Corporation, Alphabet Inc., Hilton Worldwide Holdings Inc., Mastercard Incorporated, Moody's Corporation, and 3 more
Complete Exits –
None reported
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 |
|---|---|---|---|---|---|---|---|
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 |
Q4 2024 | FICO Fair Isaac Corporation | Fair Isaac Corporation | Sell | -33,982 | -98.1% | $1.33M | 670 |
Q4 2024 | GOOGL Alphabet Inc. | Alphabet Inc. | Buy | +146,896 | +4.4% | $658.92M | 3,480,801 |
Q4 2024 | HLT Hilton Worldwide Holdings Inc. | Hilton Worldwide Holdings Inc. | Buy - Position Entry | +91,328 | - | $22.57M | 91,328 |
Q4 2024 | MA Mastercard Incorporated | Mastercard Incorporated | Sell | -33,779 | -5.4% | $308.70M | 586,254 |
Q4 2024 | MCO Moody's Corporation | Moody's Corporation | Sell | -115,714 | -10.8% | $450.13M | 950,905 |
Q4 2024 | MSFT Microsoft Corporation | Microsoft Corporation | Sell | -43,175 | -2.2% | $797.33M | 1,891,641 |
Q4 2024 | TDG Transdigm Group Incorporated | Transdigm Group Incorporated | Sell | -47,660 | -4.5% | $1.27B | 1,000,604 |
Q4 2024 | V Visa Inc. | Visa Inc. | Sell | -243,471 | -21.8% | $276.51M | 874,912 |