S&P 500 surges to 10-month high on debt-ceiling deal and Nvidia's market cap.

US stock index futures are mixed after a debt-ceiling deal was agreed, but still needs to pass Congress before next Monday. The S&P 500 is looking to start the week at fresh 10-month highs, while technology stocks rallied further on optimism about the prospects for products based on artificial intelligence software. Support could come from big technology stocks as investors look for more AI exposure and valuations are helped by retreating bond yields as debt ceiling angst eases, according to analysts.