July 23 (Reuters) - Wall Street's main indexes opened lower

on Thursday, as concerns over heavy AI spending resurfaced after

the first batch of Big Tech earnings, while another jump in oil

prices linked to the widening Middle East conflict further

dampened sentiment.

The Dow Jones Industrial Average fell 463.0 points,

or 0.89%, at the open to 51755.54. The S&P 500 fell 80.7

points, or 1.08%, at the open to 7418.29​, while the Nasdaq

Composite dropped 445.4 points, or 1.73%, to 25245.542

at the opening bell.