Taiwanese lens maker Genius Electronic Optical jumped to an all-time high, a positive sign for Apple's supply chain heading into the autumn launch season.

• The stock rose more than 6% at its peak, setting a record before easing back to a smaller gain.
• Apple has set a September 10 launch event for its new iPhones, lifting hopes for orders across the parts makers that supply it.
• The company said phone lens orders are running stronger this year than last, though it depends on how well Apple's phones actually sell.
• Foreign investors flipped from selling to buying the stock, adding to the push.
• Day traders made up more than 40% of trading volume, so the price could swing hard in both directions.

Outlook: The stock likely stays hot into the September 10 Apple event, but heavy short-term trading leaves it exposed to a quick pullback.