“Apple’s market capitalization has dropped by roughly $90 billion since July 20, as CNBC first noticed. Apple stock has been dropping since July 20, the day before it reported earnings. As of Tuesday, for example, stocks were down by more than 14% since that date. Apple stock is currently up 0.38% at $115.07 per share. At its highest, Apple’s market cap surpassed $765 billion earlier this year in February. Analysts have been concerned about Apple’s reliance on the iPhone, whose sales are slowing, and think it will be hard for Apple to grow its smartphone market share in China — last quarter, Apple’s share slipped into third place behind Xiaomi and Huawei, according to Canalys.”
http://www.businessinsider.com/apple-market-cap-down-90-billion-2015-08