By Shreyashi Sanyal
(Reuters) - U.S. stock index futures pointed to a flat open on Wednesday, held back by worries over the Sino-U.S. trade war, while Apple shares moved higher ahead of the expected launch of three new iPhone models.
Shares of Apple rose 0.3 percent in premarket trading, ahead of an event at 1 p.m. ET (1700 GMT).
Chevron's 1.1 percent gain was the most among the components of the Dow Industrials trading premarket, partly helped by HSBC's upgrade for the stock.
Lingering worries over an escalation in trade dispute got a fresh impetus on Tuesday after President Donald Trump said Washington was taking a tough stance with China, cementing expectations that fresh levies on Chinese exports will soon be announced.
More than 60 U.S. industry groups are launching a coalition to take the fight against Trump's tariffs public.
"But if he doesn't, then we could be heading towards some serious trouble and the longer the spat continues, the more concerning it is to markets."
Gilead Sciences rose 4.2 percent after its rheumatoid arthritis drug, being developed jointly with Galapagos NV, met the main goal of a study.
Nielsen was up 4.2 percent after the TV ratings provider said it will expand a review of strategic options to include a sale of the entire TV ratings company.
The Federal Reserve's "Beige Book," a summary of the state of U.S. business across the central bank's 12 regional districts for the month of August, is expected at 2 p.m. ET (1800 GMT).
(Reporting by Shreyashi Sanyal in Bengaluru; Editing by Arun Koyyur)
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