US Stocks Snapshot-S&P 500, Nasdaq open lower as caution builds ahead of Big Tech earnings

July 22 (Reuters) - The S&P 500 and the Nasdaq opened lower on Wednesday pressured by weakness in chip stocks, as investors remained cautious ahead of the first batch of Big Tech earnings that could decide whether Wall Street's AI-driven rally has more room to run.

The Dow Jones Industrial Average .DJI rose 62.5 points, or 0.12%, at the open to 52287.14. The S&P 500 .SPX fell 11.7 points, or 0.16%, at the open to 7497.47, while the Nasdaq Composite .IXIC dropped 143.5 points, or 0.56%, to 25693.719 at the opening bell.