Core Viewpoint - Major investors, including Tiger Global Management and Adage Capital Partners, reduced their holdings in key AI companies like Nvidia and Amazon in Q4 2025 due to concerns over high valuations and insufficient returns on AI investments [1][2]. Group 1: Investor Actions - Tiger Global Management decreased its Microsoft shares from 6.5 million to 5.47 million, maintaining a significant investment valued at $2.6 billion [3]. - The firm also reduced its Amazon holdings by 9.35%, ending 2025 with 10 million shares valued at $2.3 billion [3]. - Additionally, Tiger Global reduced its Nvidia position, which is currently valued at $2.1 billion [3]. Group 2: Adage Capital's Strategy - Adage Capital reported minor reductions in its stakes in Microsoft, Alphabet, Amazon, and Nvidia, with decreases ranging from 1% to 3% [3]. - The firm increased its Oracle holdings by approximately 19%, bringing its total to 1.87 million shares valued at about $365 million [3].