US STOCKS SNAPSHOT-Wall St opens lower as tariff uncertainty prevails, chipmakers slide

March 6 (Reuters) - Wall Street's main indexes opened lower on Thursday as uncertainty about a trade war unleashed by U.S. tariffs clouded sentiment, while chip stocks slid after Marvell's forecast fanned worries of slowing demand for AI infrastructure.

The Dow Jones Industrial Average .DJI fell 158.1 points, or 0.37%, at the open to 42,848.49. The S&P 500 .SPX fell 56.8 points, or 0.97%, to 5,785.87​, while the Nasdaq Composite .IXIC dropped 348.2 points, or 1.88%, to 18,204.528.