Mark Massey - AltaRock Partners Portfolio Position Sizes (Q2 2026)

According to the SEC 13F filed on Aug 17, 2026, the AltaRock Partners portfolio balances reported a total equity value of $4.24B across 8 publicly traded holdings as of quarter-end Jun 30, 2026.

The portfolio balances highlight AMAZON.COM INC (AMZN) as the single largest position, accounting for 32.2% of total equity value, followed by TRANSDIGM GROUP INC (TDG), MICROSOFT CORP (MSFT), MASTERCARD INC-CLASS A (MA), and others. Collectively, the top five holdings represent 96.3% of the portfolio, showing how capital is distributed among core positions and long-term investments.