S&P 500 ends barely changed; Nvidia shares up after the bell

By Caroline Valetkevitch NEW YORK (Reuters) -The S&P 500 ended little changed on Wednesday ahead of quarterly results from Nvidia, whose positive outlook could set the tone for the artificial intelligence sector. Stocks lost ground in afternoon trading, with investors digesting the latest comments from U.S. President Donald Trump on tariffs. Trump said on Wednesday his administration will soon