Alibaba bears pounce on concerns

Leading short-sellers have long been hinting that firm's growth figures are too good to be true

Traders have never been more bearish on Alibaba Group Holding Ltd, the fast-growing Chinese e-commerce company facing a regulatory probe and the loss of a key investor.

The total number of outstanding shares borrowed for short selling peaked at more than 124 million last week. That's the most since its 2014 initial public offering and is up from about 60 million in December, according to data compiled by Bloomberg and Markit Ltd.