Mark Massey's Top Holdings: Amazon, Transdigm, Microsoft Dominate Portfolio as of March 31, 2026
Mark Massey's portfolio, managed by AltaRock Partners, is heavily concentrated in technology and industrials, with Amazon and Transdigm leading holdings as of March 31, 2026.
As of March 31, 2026, Mark Massey, managing investments through AltaRock Partners, holds a substantial portfolio valued at $4.13 billion. His top holdings reflect a strategic focus on technology, industrials, and financial services, with significant allocations to market leaders and specialized firms.
Amazon.com Inc. (AMZN) stands as the largest holding in Mark Massey's portfolio, representing approximately 38.2% of the total value. With a significant increase in shares held (+3.46%) compared to the prior period, Amazon continues to be a cornerstone of his investment strategy. For more details on this stock, you can visit Insiderset.
Transdigm Group Inc. (TDG) is the second-largest holding, accounting for 25.54% of the portfolio. Although the number of shares decreased by 6.21%, Transdigm remains a key component of Massey's holdings. Further information on Transdigm can be found at Insiderset.
Micrsoft Corp. (MSFT) follows closely with a 16.75% allocation. However, this position saw a notable reduction, with shares decreasing by 10.32% from the previous period. Details on Microsoft are available on Insiderset.
The remaining significant portion of the portfolio is allocated to Financial Services companies. Moody's Corp. (MCO) holds a 9.11% allocation, with a modest increase in shares (+5.84%). Mastercard Inc. (MA) and Visa Inc. (V) together make up about 10.08% of the portfolio, with Mastercard seeing a slight share increase and Visa experiencing a decrease (-3.51%). You can explore Mastercard at Insiderset and Visa at Insiderset.
Mark Massey's portfolio also includes smaller stakes in Alphabet Inc. (GOOGL) and Hilton Worldwide (HLT), representing 0.3% and 0.11% of the total, respectively. Both positions saw substantial declines (-74.38% and -97.17% in shares). For more information on Alphabet, visit Insiderset, and on Hilton, see Insiderset.
For a complete overview of Mark Massey's investment profile, including all holdings and performance, you can visit his profile on Insiderset.