Mark Massey's Portfolio: Heavyweights Dominate with Tech & Industrials
Mark Massey's portfolio, as of December 31, 2025, is characterized by significant concentration in Amazon, Transdigm, and Microsoft, with a strong focus on Consumer Cyclical and Technology sectors.
Key Holdings
Mark Massey's portfolio is dominated by a select group of large-cap stocks. The top holding by value is Amazon.com Inc. (AMZN), representing approximately 33.1% of the portfolio. This is followed by Transdigm Group Inc. (TDG) at 25.28% and Microsoft Corp. (MSFT) at 19.75%. Collectively, these three stocks account for nearly 78.18% of the total portfolio value.
Strategic Sectors
The portfolio exhibits a strong bias towards specific sectors. Consumer Cyclical is the largest sector allocation, driven primarily by Amazon.com Inc. (AMZN). Technology is the second-largest sector, dominated by Microsoft Corp. (MSFT). Industrials is represented by Transdigm Group Inc. (TDG) and accounts for 25.28% of the portfolio. Financial Services, encompassing Mastercard, Moody's, and Visa, holds a combined allocation of 15.68%.
Recent Changes
The portfolio has seen reductions in several major holdings during the prior period. Notably, Microsoft Corp. (MSFT) experienced an 18.95% decrease in its share count. Transdigm Group Inc. (TDG) saw a reduction of 0.72%, while Amazon.com Inc. (AMZN) decreased by 3.22%. Other significant holdings like Moody's Corp. (MCO) and Mastercard Inc. (MA) also showed declines of 14.15% and 7.23% respectively in their share counts.
Investment Profile
Mark Massey, managing investments at AltaRock Partners, appears to employ a concentrated investment strategy. The portfolio's significant allocation to a few large technology and industrials companies suggests a focus on high-growth and cyclical sectors. The substantial weight given to Consumer Cyclical (via Amazon) and Technology (via Microsoft) indicates confidence in these sectors' performance. The inclusion of Financial Services holdings (Mastercard, Moody's, Visa) adds diversification within the defensive sectors, though still dominated by the larger technology and industrials positions.
The strategy involves holding substantial positions in leading companies within targeted sectors, albeit with a degree of concentration. The recent reductions in share count for most major holdings could reflect rebalancing activities, anticipation of future performance, or adjustments based on market conditions. The portfolio's structure points towards a conviction-based approach focused on capturing significant upside from a select group of high-quality growth and cyclical companies.