Alibaba Group founder Jack Ma Yun has revealed fresh details of the firm's partnership structure that regulators fear could give too much voting power to company executives after a planned share sale. The structure was explained in an e-mail from Ma to staff yesterday and obtained by the South China Morning Post . An Alibaba spokesman confirmed the document was genuine. The e-mail said the partnership scheme had begun in 2010 and had elected 28 partners over a three-round selection process following strict eligibility criteria. "It is not a mere profit-sharing mechanism, nor is it a vehicle of power to exert greater control over the company," the document said. Hong Kong Exchanges and Clearing and the Securities and Futures Commission fret that the partnership effectively creates a dual structure con- ferring more rights on one group of shareholders than another. Such structures are not permitted for new listings in Hong Kong.