Shares in Apple have fallen 2% after the tech giant said it would not release figures for the first weekend of iPhone 7 sales.
It is the biggest drop in Apple shares since the UK’s Brexit vote sparked a mass selloff on global stock markets.
“Less data is never good, particularly given the question marks around this phone,” said BGC Partners analyst Colin Gillis.
Apple unveiled the latest iPhone on Wednesday amid slowing handset sales.
Shares in Google parent company Alphabet are down nearly 1% after the search engine giant announced a $625m takeover of software developer Apigee to strengthen its cloud computing business.
The tech-focused Nasdaq fell 17 points to 5,267 in morning trading.
The Dow Jones lost 20 points to 18,506, while the S&P 500 was more or less where it started the day at 2,184 points.
Energy stocks bucked the trend on the back of a 3.5% rise in the oil price.
US crude was up by $1.60 to $47.12 a barrel after government figures showed a surprise drop in US oil stockpiles last week.
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