Dutch bank ABN AMRO has agreed to increase its stake in its Chinese fund management venture XIANGCAI SECURITIES, China's seventh largest brokerage house, to the current legal ceiling of 49% from 33% in its joint venture ABN AMRO XIANGCAI FUND MANAGEMENT. 51% will be kept by the Chinese company. XIANGCAI SECURITIES is planning to sell a stake to one of three investment banks vying for only the second such deal in the Chinese mainland: CITIGROUP (United States), CREDIT SUISSE FIRST BOSTON...