Yahoo Finance·2026-02-19 23:33Group 1: Investment Activity - Citadel, led by Ken Griffin, has significantly increased its investment in Amazon, adding approximately $2.52 billion, bringing its total position to over $3.2 billion [1] - Citadel has also doubled its stake in Nvidia, now valued at nearly $4 billion, indicating a strong interest in AI-related investments [1] - Other notable investors, such as Ray Dalio's Bridgewater, have also increased their positions in Nvidia, with a $253 million investment, raising their total stake to nearly $721 million [3] Group 2: Market Performance - Amazon's stock has experienced volatility, down 11.3% year-to-date and over 14% in the past month, largely due to its aggressive $200 billion capital spending plan related to AI [2] - Despite investor concerns regarding AI, Amazon's fundamentals remain strong, supported by a healthy AI-powered backlog and robust cloud sales [2] Group 3: Citadel's Portfolio Overview - Citadel's latest 13F filing shows a market value increase to $0.67 trillion, with inflows of +0.52% as a percentage of total market value [6] - The fund made new purchases in 2,088 stocks, added to 5,010 stocks, and sold out of 2,204 stocks, while reducing holdings in 5,384 stocks [6] - The concentration of the top 10 holdings is at 22.8%, with a turnover rate of 29.2% [6]