shares of zepp health corp zepp dropped 40 in premarket trading friday after the chinabased smart health technology company cut its fourthquarter revenue outlook citing a greater than anticipated effects of covid and a more persistent global shortage of semiconductors the company now expects fourthquarter revenue of between rmb16 billion 2520 million and rmb175 billion 2756 million compared with previous guidance of between rmb175 billion and rmb20 billion the company said it still expects to be profitable separately the company said it has repurchased 36 million worth of its stock since nov 16 when it announced a 20 million stock buyback program zepps stock has tumbled 574 this year while the ishares msci china etf mchi has dropped 220 and the sp 500 spx has soared 272