U.S. stocks opened mixed on Sept. 29, with the S&P 500 and Nasdaq Composite advancing as oil prices retreated and reports about Anthropic’s public offering supported technology-stock sentiment. Reuters-reported opening figures showed the Dow down 0.13% to 51,416.96, the S&P 500 up 0.21% to 7,699.6 and the Nasdaq up 0.31% to 26,904.60. Separate Binance data cited by PANews showed the Dow down 0.05%, the S&P 500 up 0.15% and the Nasdaq up 0.51%, while earlier MSX.COM data reported smaller moves and gains in several AI-related shares.