道指开盘跌0.5%，标普500跌0.9%，纳指跌1.4%

Group 1 - Tesla's stock fell by 4.2%, dropping below $400, marking a negative trend for the year [1] - CoreWeave experienced a decline of 3.8%, being identified by media as the "core of the AI bubble" [1] - Walmart's shares decreased by 2.5% as CEO Doug McMillon announced his retirement in January [1] Group 2 - Cidara Therapeutics saw a significant increase of 104.9% after Merck agreed to acquire the company for $9.2 billion in cash [1] - Warner Bros. Discovery's stock rose by 2.8%, with Paramount, Comcast, and Netflix planning to participate in bidding for the company [1]