Mark Massey – AltaRock Partners Portfolio Activity & Recent Trades (Jun 30, 2025)
As of Jun 30, 2025, the AltaRock Partners portfolio activity showed several notable changes in holdings, according to the latest SEC 13F filing reported on Aug 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 Q2 2025, the filing reported:
New Buys – None reported
Increases – Amazon.com, Inc. (AMZN), Hilton Worldwide Holdings Inc. (HLT), Moody's Corporation (MCO)
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.
AltaRock Partners Activity
| Date | Symbol | Type | Quantity |
|---|---|---|---|
Q1 2017Mar 31, 2017 | CHTR Charter Communications, Inc. | Sell | -96,100-20.0% |
Q4 2016Dec 31, 2016 | TDG Transdigm Group Incorporated | Buy | +152,356+34.7% |
Q4 2016Dec 31, 2016 | MCO Moody's Corporation | Buy | +113,336+11.7% |
Q4 2016Dec 31, 2016 | CHTR Charter Communications, Inc. | Sell | -66,300-12.1% |
Q4 2016Dec 31, 2016 | WAB Westinghouse Air Brake Technolo | Sell | -150,000-17.9% |
Q3 2016Sep 30, 2016 | WAB Westinghouse Air Brake Technolo | Buy - Position Entry | +839,826 |
Q3 2016Sep 30, 2016 | IBKR Interactive Brokers Group, Inc. | Sell - Position Exit | -7,201-100.0% |
Q3 2016Sep 30, 2016 | MCO Moody's Corporation | Sell | -27,019-2.7% |
Q3 2016Sep 30, 2016 | BRK-B Berkshire Hathaway Inc. New | Sell - Position Exit | -315,375-100.0% |
Q2 2016Jun 30, 2016 | CHTR Charter Communications, Inc. | Buy - Position Entry | +547,937 |
Q2 2016Jun 30, 2016 | BRK-B Berkshire Hathaway Inc. New | Buy - Position Entry | +315,375 |
Q2 2016Jun 30, 2016 | IBKR Interactive Brokers Group, Inc. | Sell | -20,000-73.5% |
Q2 2016Jun 30, 2016 | MCO Moody's Corporation | Sell | -47,780-4.6% |
Q2 2016Jun 30, 2016 | TDG Transdigm Group Incorporated | Sell | -291,067-39.9% |
Q1 2016Mar 31, 2016 | MCO Moody's Corporation | Buy | +197,429+23.4% |
Q1 2016Mar 31, 2016 | TDG Transdigm Group Incorporated | Buy | +34,972+5.0% |
Q1 2016Mar 31, 2016 | V Visa Inc. | Buy | +32,100+12.8% |
Q4 2015Dec 31, 2015 | MCO Moody's Corporation | Buy | +107,860+14.7% |
Q4 2015Dec 31, 2015 | TDG Transdigm Group Incorporated | Buy | +75,380+12.2% |
Q3 2015Sep 30, 2015 | MCO Moody's Corporation | Buy | +267,595+57.3% |
Q3 2015Sep 30, 2015 | TDG Transdigm Group Incorporated | Buy | +186,242+43.0% |
Q3 2015Sep 30, 2015 | MA Mastercard Incorporated | Buy | +8,300+2.1% |
Q3 2015Sep 30, 2015 | IBKR Interactive Brokers Group, Inc. | Sell | -5,900-17.8% |
Q3 2015Sep 30, 2015 | V Visa Inc. | Sell | -29,660-10.6% |
Q2 2015Jun 30, 2015 | TDG Transdigm Group Incorporated | Buy | +201,871+87.1% |
Q2 2015Jun 30, 2015 | MA Mastercard Incorporated | Buy | +83,700+26.9% |
Q2 2015Jun 30, 2015 | MCO Moody's Corporation | Buy | +34,699+8.0% |
Q2 2015Jun 30, 2015 | IBKR Interactive Brokers Group, Inc. | Buy - Position Entry | +33,101 |
Q2 2015Jun 30, 2015 | V Visa Inc. | Sell | -65,000-18.8% |
Q1 2015Mar 31, 2015 | V Visa Inc. | Buy | +279,732+428.1% |