智通财经网·2025-12-31 12:59Core Viewpoint - The U.S. stock market is entering its third year of a bull market driven by the AI boom, with the S&P 500 index expected to end 2025 with a gain of over 17% [1] Winners - Technology stocks, particularly those related to AI, are leading the U.S. stock market this year, with storage companies like SanDisk, Western Digital, Micron Technology, and Seagate Technology showing significant gains of 585%, 292%, 249%, and 231% respectively [2] - The demand for storage capacity and bandwidth from AI servers far exceeds that of traditional servers, leading to a price surge in the storage industry as production shifts towards high-end storage products [2] - Palantir has seen a year-to-date increase of 139%, likely achieving a three-digit percentage gain for the third consecutive year, although it is considered expensive with a forward P/E ratio exceeding 180 [6] - Warner Bros. Discovery's stock has surged nearly 174% this year due to acquisition news, with ongoing bidding from Netflix and Paramount Global for the company [8] - Several stocks, including Robinhood, SanDisk, AppLovin, and Carvana, have been added to the S&P 500 index in 2025, all achieving triple-digit percentage gains [12] Losers - Economic uncertainty and tariffs have negatively impacted consumer stocks, particularly essential consumer goods companies like Clorox, Lamb Weston, Campbell Soup, and Constellation Brands, which are among the worst performers in the S&P 500 [15] - Deckers Outdoor, known for brands like Hoka and Ugg, has seen a nearly 50% decline in 2025, ending a nine-year growth streak due to weak earnings forecasts and analyst downgrades [15] - Health insurance stocks have also performed poorly, with Molina Healthcare's stock down over 40% and both UnitedHealth and Centene seeing declines exceeding 30% [15] - Despite the poor performance, some investors see potential for a rebound in health insurance stocks due to attractive valuations, with Michael Burry expressing bullish sentiment on Molina Healthcare [18]