NEW YORK, Sept 10 — Apple Inc and GT Advanced Technologies Inc were among the biggest movers in premarket trading today, with both seeing heavy action a day after Apple’s latest product launch event.

Apple rose 0.4 per cent to US$98.41 (RM313) on volume of almost 349,000 shares, making it the most active stock on Nasdaq before the opening bell.

Shares of Apple were extremely volatile yesterday, rising as high as 4.8 per cent and dropping as much as 2.3 per cent before it closed down 0.4 per cent, its fourth drop of the past five sessions.

On a price basis, Apple moved US$6.94 between peak and trough yesterday, well over the US$1.30 average over the past 250 sessions and the biggest one-day intraday move since May 2010.

The activity came as the tech giant unveiled two new iPhones types and a smartwatch, which represents the launch of a new product category. While investors were pleased to see a new type of product, which has fueled the stock’s blistering growth rates in the past, the watch’s need to be tethered to a iPhone created some mixed impressions.

GT Advanced fell 9.7 per cent to US$13.49 today, extending yesterday’s slump of nearly 13 per cent. That decline, which occurred on the stock’s heaviest-ever volume, came as Apple said the new iPhone wouldn’t feature screens made with GT’s sapphire glass.

Today, Goldman Sachs downgraded GT to “neutral” from “buy” and cut its price target on the stock. Cowen also cut its GT target. — Reuters