(Bloomberg/Natalia Kniazhevich) US stocks advanced, driven by tech shares, after an OpenAI share sale valued the artificial intelligence company at an $500 billion. The S&P 500 rose 0.3% as of 9:33 am in New York, while the Nasdaq 100 gained 0.5%. Stocks climbed even as the US government shutdown stretched into a second day, causing a delay of weekly jobless claims and factory orders data. A separate report from outplacement firm Challenger, Gray & Christmas showed that US employers dialed back hiring plans in September,