July 24 (Reuters) - The tech-heavy Nasdaq took the

biggest hit in a weak open for Wall Street on Wednesday, after

lackluster quarterly results from Tesla and Alphabet raised

questions about the dominance of Big Tech and the AI boom.

The Dow Jones Industrial Average fell 147.46 points,

or 0.37%, at the open to 40,210.63. The S&P 500 opened

lower by 49.90 points, or 0.90%, at 5,505.84, while the Nasdaq

Composite dropped 263.44 points, or 1.46%, to 17,733.91

at the opening bell.