Aug 7 (Reuters) - Wall Street's main indexes opened

higher on Thursday, buoyed by optimism that major technology

companies could avoid U.S. President Donald Trump's latest

tariffs on chip imports.

The Dow Jones Industrial Average rose 237.0 points,

or 0.54%, at the open to 44430.09. The S&P 500 rose 29.3

points, or 0.46%, to 6374.32​, while the Nasdaq Composite

rose 155.6 points, or 0.73%, to 21325.01.