U.S. stocks rose Thursday as investors looked past the government shutdown to enjoy the afterglow of OpenAI’s jaw-dropping, $500 billion valuation.gettyU.S. stocks rose Thursday as investors overlooked the government shutdown to enjoy the afterglow of OpenAI’s jaw-dropping,$500 billion valuation. The large-cap S&P 500 index rose 0.1%, the technology-focused Nasdaq Composite rose 0.4%, and the Dow Jones Industrial Average, the blue-chip index, rose 0.2%. The S&P 500 and the Nasdaq Composite hit new record h ...