Mark Massey's Top Holdings Snapshot: Focus on Major Tech & Industrials as of March 31, 2026
Mark Massey's portfolio, valued at approximately $4.13 billion as of March 31, 2026, features Amazon and Transdigm as top holdings. Notably, Amazon shares increased, while Transdigm and Microsoft saw significant reductions.
As of March 31, 2026, Mark Massey's portfolio at AltaRock Partners is valued at approximately $4.13 billion. His top holdings reflect a concentration in major technology and industrials sectors, with Amazon.com Inc. (AMZN) leading at a 38.2% allocation, followed by Transdigm Group Inc. (TDG) at 25.54%.
Amazon.com Inc. (AMZN) represents the largest position, with a significant increase in shares held during the period, growing by 3.46%. Investors can learn more about Mark Massey's investment activity here: https://www.insiderset.com/investor/mark-massey-altarock-partners and about Amazon.com Inc. here: https://www.insiderset.com/investors/stocks/AMZN.
Transdigm Group Inc. (TDG), a key player in the Industrials sector, holds a substantial 25.54% allocation but experienced a notable decrease in shares, down by 6.21%. Further details on Transdigm Group Inc. are available here: https://www.insiderset.com/investors/stocks/TDG.
Micrsoft Corp. (MSFT) is another major holding at 16.75% allocation, but it saw a significant reduction in shares, down by 10.32%. More information on Microsoft Corp. can be found here: https://www.insiderset.com/investors/stocks/MSFT.
The portfolio also includes Moody's Corp. (MCO), Mastercard Inc. (MA), and Visa Inc. (V), all in the Financial Services sector, showing modest changes. Hilton Worldwide (HLT) in Consumer Cyclical also has a small allocation but saw a drastic reduction.