Despite record sales of more than 13 million of the newest iPhones in the three days following its launch, IC suppliers in Taiwan have expressed concern that Apple may cut back on its chip orders for the iPhone.

A major analogue IC supplier said that Apple has lowered its orders for supplies for the new iPhones for December, sources told the DigiTimes.

Total iPhone 6s shipments were expected to hit 75-80 million units in Q4, but estimates for the quarter have been reduced to 65-70 million, the sources said. A year ago Apple shipped an estimated 74.5 million iPhone 6 units in Q4.

The reduction follows the sharp fall in China’s stock market over the past two months, which is expected to impact consumer demand. And the move by the Chinese government to devalue the yuan last month could cut into Apple’s margins in the mainland unless it is able to raise prices.

While Apple’s OEMs have kept IC stocks for the iPhone 6s models at high levels in anticipation of a 75 million unit quarter, DigiTimes said IC suppliers will need to wait one to two months to know if there will be significant cuts in IC orders.

Foxconn and Pegatron, the two main assemblers of the new iPhone, reportedly have been running at full capacity due to strong sales of the 6s Plus in China and other Asian markets.

Meanwhile, Taiwan’s fabless IC firms expect Q3 gross margins to drop 1-2 points from the previous quarter due to a 10-20 per cent decline in chip prices, DigiTimes reported.