Infineon and AMS have issued warnings to investors about future growth, which has made investors more worried about the prospects of chip makers and Apple suppliers.

Infineon said on Tuesday that its revenue growth is at the lower end of the 2019 fiscal year forecast and plans to reduce investment.

AMS, which provides sensors for companies including Apple, said it will suspend its cash dividend policy as its first-quarter revenue is expected to be lower than analysts' expectations. Wireless chip company Nordic Semiconductor ASA also reported that its losses were greater than analysts' expectations.

UBS analysts report that in the past two years, after the success of semiconductor companies, as demand began to weaken, it ended in the downturn in 2018.

Infineon CEO Reinhardopoulos said in a conference call with analysts that the current market environment is highly uncertain, and Infineon will monitor supply and demand with great care.