Tech Rebounds After Chip Selloff. Dow Futures Fall Amid Iran Fears on Crunch Day for Markets.

Tech stocks were on course to pare back some of their recent losses on Tuesday, although the broader market looked set to struggle as investors fretted about the flare-up in tensions between the U.S. and Iran. Nasdaq 100 futures climbed 0.3%. Dow Jones Industrial Average futures fell 137 points, or 0.3%.