![Shares in Apple supplier AMS plunge 20 percent]( "Shares in Apple supplier AMS plunge 20 percent")
Shares in AMS AG lost a fifth of their value on Thursday after a sales warning from major customer Apple brought concerns over the challenges for the Austrian sensor specialist sharply into focus. AMS provides Apple with optical sensors for 3D facial recognition features on its newest smartphones, but analysts have highlighted increasing competitive pressure, a threat from new technologies and overcapacity issues facing the company. Apple warned on Wednesday that sales in its holiday season quarter would be lower than expected, blaming slowing iPhone sales in China.
