US stocks have rebounded from early losses to snap a four-day losing streak after US President Donald Trump and Treasury Secretary Steven Mnuchin said trade talks between the United States and China were "constructive".

The US said the companies listed raised security concerns as they were part of China's efforts to develop supercomputers which could be used by the military.

All it took was the omission of one word from the Fed's latest statement to bring cheer back to Wall Street, but now bubble fears are rising.

Tensions between the United States and Iran undercut sentiment, leaving Wall Street in the red.

It relaunched its Australian website earlier this month and now new stores are coming to the US.