All three PCB manufacturers are spending serious money to expand production for Apple. Zhen Ding is Apple's largest supplier of printed circuit boards, and is planning on spending $100 million to add production capacity. The company expects to snag orders from Apple, not just for the iWatch, but also for its large-screened Apple iPhone phablet, and the Apple iPhone 6.
Flexium plans on spending $50 million to $66 million to increase production of its mid-range to high-end products. That is expected to lead to a 20% increase in revenue for the company. Carrier will spend $33 million this year, to expand production in Taiwan and China.