Key Points
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Four billionaires significantly increased their stakes in Alphabet during Q4 2025.
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Three billionaires made substantial additions to their holdings in Amazon.
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Bill Ackman initiated a major position in Meta, while David Tepper also expanded his stake.
During the fourth quarter of 2025, Citadel Advisors’ Ken Griffin increased his investment in Alphabet by 39.8%, while Stanley Druckenmiller of Duquesne Family Office boosted his stake by 276.7%. David Tepper’s Appaloosa added 28.9% to its holdings, indicating strong confidence among these billionaire investors.
In Amazon, Griffin’s Citadel saw a remarkable 336.2% increase in investment, alongside significant additions by Ackman and Druckenmiller of 65% and 68.8%, respectively. Conversely, Tepper reduced his Amazon position by 12.8%. Additionally, Ackman initiated a new stake in Meta Platforms, while Tepper increased his holdings by approximately 62.2%. Notably, the Meta platform commands 3.58 billion daily active users, positioning it well for future growth.
