U.S. stock market

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Senators accuse Yahoo of 'unacceptable' delay in hack discovery

 Six senators on Tuesday demanded that Yahoo Inc (YHOO.O) explain why hackers' theft of user information for 500 million accounts two years ago came to light only last week and called the company's handling of the breach "unacceptable."

Five things the U.S. stock market is worried about after last week's rout

 Investors were hoping 2016 would be a fresh start after the U.S. stock market sputtered to wrap up 2015. Instead, what they got was rotten.