Yahoo Financeยท2025-09-17 15:57Group 1 - Lyft shares surged after Waymo, a subsidiary of Alphabet, announced an expanded partnership to introduce robotaxi services in Nashville starting next year, while Uber's shares declined [3] - U.S.-listed shares of Alibaba increased following reports that China Unicom will purchase its artificial intelligence semiconductors [3] - Workday's stock was the best performer in the S&P 500 after Elliott Investment Management disclosed a stake of over $2 billion and praised the company's management strategy [2][5] Group 2 - Nvidia shares fell after reports indicated that China has blocked the sale of its AI chips to local tech companies, impacting other chipmakers and AI-related stocks like Broadcom, Oracle, and Palantir [4][5] - Major U.S. equity indexes showed mixed performance ahead of a crucial Federal Reserve interest rate decision, with the Dow rising while the S&P 500 and Nasdaq experienced declines [2][5] - Oil and gold futures saw slight decreases, while the yield on the 10-year Treasury note remained stable [4]