HONG KONG - Trading in shares of Alibaba.com Ltd was suspended on Thursday, pending clarification of speculation in relation to a transaction involving the controlling shareholder of the company, according to a filing on the Hong Kong exchange.

No further details were immediately available.

Yahoo Inc Chairman Roy Bostock and three other directors will step down as the struggling company ploughs ahead with an internal overhaul, including discussions on dealing with its stakes in China's Alibaba Group and Yahoo Japan Corp.