十宗“最”，盘点美股这一年

Group 1: Company Performance - The Trade Desk has experienced a year-to-date decline of 68%, making it the worst-performing stock in the S&P 500 due to concerns over slowing advertising revenue and uncertain growth prospects, compounded by high valuation pressures [3] - Oracle has shown extreme volatility in 2025, with a 52-week price range from $118.86 (low) to $345.72 (high), reflecting a fluctuation of nearly 190%. The stock surged in September following positive earnings and a significant order from OpenAI, but later faced declines as investors weighed AI risks and reports of data center delays intensified panic, leading to severe sell-offs of its corporate bonds and skyrocketing credit default swaps (CDS) [4] Group 2: Market Capitalization - As of the end of 2025, NVIDIA's market capitalization has risen to $4.54 trillion, making it the largest publicly traded company globally, followed by Apple at approximately $4.03 trillion and Alphabet (Google's parent company) at about $3.78 trillion [6] Group 3: Initial Public Offerings (IPO) - Medline, a major U.S. medical supplies company, went public on December 17, with its stock soaring 41% on the first day, resulting in a market capitalization of $54 billion. This IPO raised $6.26 billion, marking it as the largest IPO in the U.S. and globally for 2025 [8] Group 4: Stock Index Movements - On April 9, 2025, following President Trump's announcement to suspend tariffs for 90 days, U.S. stock markets rebounded dramatically, with the S&P 500 rising by 9.5%, the Nasdaq soaring by 12.2% (the largest single-day increase since early 2001), and the Dow Jones increasing by 7.8% [9] - Conversely, on April 4, 2025, the escalation of the tariff war led to a significant market crash, with the Dow plummeting by 2,231 points (5.5% drop), the S&P 500 falling nearly 6%, and the Nasdaq declining by 5.8%, entering bear market territory with a drop exceeding 20% from its peak [10] Group 5: Sector Performance - The communication services sector in the U.S. stock market has surged approximately 32.4% in 2025, driven by the AI wave and profit growth, making it the best-performing sector among the S&P 500 [11] - In contrast, the real estate sector has lagged significantly, with a year-to-date decline of 0.35%, being the only sector among the 11 S&P 500 segments to experience a drop [13]