联代科技尾盘突然暴拉。 当地时间2025年12月31日（周三），美股三大指数小幅收低，标普500指数录得连续第四个交易日下滑。三大股指在2025年均录得涨幅，其中标普500指数 上涨16.39%。 截至收盘，道指跌303.77点，跌幅为0.63%，报48063.29点；纳指跌177.09点，跌幅为0.76%，报23241.99点；标普500指数跌50.74点，跌幅为0.74%，报 6845.50点。 纳指2025年大涨超20% 标普500指数录得连续第四个交易日下跌。尽管如此，该指数2025年全年仍收获16.39%的涨幅，这是其连续第三年实现两位数的年度涨幅。纳斯达克综合 指数受益于人工智能热潮，2025年累计上涨20.36%。道指在2025年上涨12.97%。 这标志着市场从2025年4月初美国总统特朗普宣布全面提高关税引发暴跌之后实现了显著反弹。2025年4月特朗普突然宣布关税措施后，标普500指数一度 濒临进入熊市，较2025年2月高点下跌近19%，并在2025年4月首次收于5000点下方，随后反弹。 周三经济数据面，美国至2025年12月27日当周初请失业金人数录得19.9万人，为2025年11月29 ...

Core Viewpoint - The article discusses the performance of major U.S. stock indices in 2025, highlighting the impact of artificial intelligence on market trends and the recent volatility in stock prices, particularly focusing on the significant rise of a specific company, 联代科技 (Liandai Technology) [2][4][13]. Market Performance Summary - In 2025, the S&P 500 index recorded a 16.39% increase, marking its third consecutive year of double-digit annual gains, despite a recent decline [4]. - The Nasdaq Composite index benefited from the AI boom, achieving a cumulative increase of 20.36% in 2025 [4]. - The Dow Jones Industrial Average rose by 12.97% in 2025, indicating a significant rebound after a sharp decline following tariff announcements by President Trump in April 2025 [4]. AI Influence on Market - Over the past three years, AI has been a decisive force driving market performance, with the S&P 500 soaring by 24% in 2023 and 23% in 2024 [5]. - In 2025, the narrative around AI diversified, with performance spreading to other sectors, and the so-called "Magnificent Seven" stocks showing varied results [5]. - Alphabet, Google's parent company, emerged as a major winner with a year-to-date increase of over 65%, while Amazon lagged with only about a 6% rise [5]. Employment Data Insights - Recent employment data showed that initial jobless claims in the U.S. fell to 199,000, the lowest since November 29, 2025, indicating a stable job market despite concerns about economic softness [6][7]. - The trend of decreasing jobless claims reflects a "few hires, few layoffs" employment environment, with claims dropping from 237,000 in early December 2025 [6]. Company-Specific Highlights - 联代科技 (Liandai Technology) experienced a dramatic surge in stock price, rising by 61.09% at the close and continuing to increase by nearly 12% in after-hours trading [13]. - The company, founded in June 2008 and listed on NASDAQ in 2021, focuses on customized product services for brand owners and telecom operators, with a recent emphasis on medical wearable devices [13].