Shares of Apple Inc’s (NASDAQ:AAPL) Asian suppliers were a mixed bag on Tuesday after the iPhone maker announced that CEO Tim Cook will transition out of the role and be replaced by insider John Ternus. 

Cook will remain with the company as executive chairman, and will stay on as CEO until Ternus takes the helm on September 1. 

Apple shares fell slightly in aftermarket trade following the announcement.

The company’s Asian suppliers, however, logged differing moves. Hong Kong and China-listed majors– including AAC Technologies (HK:2018), Lens Technology Co Ltd (HK:6613), Luxshare Precision Industry Co Ltd (SZ:002475), and Goertek Inc (SZ:002241)– fell between 1% and 2.5% on Tuesday. 

But shares in other regions advanced. TSMC (TW:2330), the world’s largest contract chipmaker and a key supplier to the company, rose 2.2% in Taipei trade, while electronics giant Hon Hai Precision Industry Co Ltd (TW:2317) rose 1.9%. 

Japan’s Murata Mfg Co (TYO:6981) rose 1.6%, while South Korea’s Samsung Electronics Co Ltd (KS:005930) and LG Innotek Co Ltd (KS:011070) rose 1.6% and 3.5%, respectively. 

Ternus– a 25-year Apple veteran who oversaw the company’s transition into building its own chips– is viewed as being much more product and hardware-focused than Cook, who is seen as an operations guru that greatly revamped Apple’s supply chain. 

Cook was at the heart of Apple’s deeply integrated, Asia-centric manufacturing process. He was seen personally managing relationships with Chinese suppliers, and was a key figure in helping Apple navigate higher U.S. trade tariffs under President Donald Trump. 

Apple acknowledged as much in its succession announcement, noting that Cook, as executive chairman, would continue “engaging with policymakers around the world.” 

But for China-based manufacturers and suppliers, this could present some uncertainty with Ternus at the helm, especially as U.S.-China relations remain strained, and as Apple seeks more supply chains outside China. 

Under Cook, the company pledged to spend $600 billion on its U.S. operations in the coming years and has been actively shifting iPhone production to India, from China.