Shares in Microsoft are the biggest winners on the Dow Jones Industrial Average so far today.
At one stage shares hit an all-time high, but fell back to trade 2.2% higher.
Investors were happy about the latest results from the software giant, which showed strong growth at its cloud computing division, called Azure.
Shares in Microsoft have almost doubled in value since Satya Nadella took over as chief executive in 2014.
"Our early investments in the intelligent cloud and intelligent edge are paying off, and we will continue to expand our reach in large and growing markets with differentiated innovation," Mr Nadella told analysts on Thursday.