U.S. stock index futures were flat early on Wednesday, held back by worries over the Sino-U.S. trade war, while Apple shares moved higher ahead of the expected launch of new iPhone models.

Shares of Apple AAPL.O rose 0.4 percent in premarket trading, ahead of an event at 1 p.m. ET (1700 GMT) in which it is expected to three new iPhone models. of energy companies were among the top gainers on the S&P 500 as oil prices hovered near $80 per barrel on growing concern over global supply. Chevron (NYSE:CVX)’s CVX.N 0.9 percent gain was the most among the Dow .DJI components trading premarket.

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. than 60 U.S. industry groups are launching a coalition to take the fight against Trump’s tariffs public. 7:38 a.m. ET, Dow e-minis 1YMc1 were down 19 points, or 0.07 percent. S&P 500 e-minis ESc1 were down 1.5 points, or 0.05 percent and Nasdaq 100 e-minis NQc1 were up 2.5 points, or 0.03 percent.

Gilead Sciences GILD.O rose 3 percent after its rheumatoid arthritis drug, being developed jointly with Galapagos NV GLPG.AS , met the main goal of a study.

Micron MU.O fell 3.7 percent after Goldman Sachs (NYSE:GS) cut its rating on expectations of lower prices for memory chips due to an oversupply of DRAM and NAND chips.

Goldman Sachs said the same condition would hit Seagate Technology STX.O and Western Digital WDC.O , echoing other brokerages. Seagate dropped 2 percent and Western Digital fell 1.5 percent.