Taiwanese lens maker Genius Electronic Optical jumped to its daily limit and an all-time high, a win for shareholders riding the Apple supply chain.

• The stock surged the maximum allowed in a day, setting a record price as buyers piled in.
• An upcoming Apple product launch is lifting suppliers across the optics group.
• August sales rose from both last month and last year, with sales for the year so far up 12% — a record for that stretch.
• The company says orders from customers are solid this quarter, but the next quarter depends on how well Apple's new products sell.
• Foreign investors were net sellers of the stock the day before, a second straight day of selling.

Outlook: The rally hinges on the Apple event and on how the new devices actually sell into year-end.