Alibaba Group Holding Ltd. devotes 16 percent of its revenue to paying employees stock, the company disclosed in an annual report on Wednesday. If the Hangzhou, China-based e-commerce giant were in the Standard & Poor’s 500 Index, it would place third in the measure, behind Vertex Pharmaceuticals Inc. and Facebook Inc. Alibaba is being investigated by the U.S. Securities and Exchange Commission over its accounting practices and whether they violate federal laws, it also disclosed in the filing.

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