Gridsum Holding Inc. announced the appointment of Herman Fong as executive director and co-president, with a focus on corporate development. Mr. Fong brings approximately 22 years of experience in the financial markets to Gridsum. Mr. Fong replaces Xiang (Sean) Fan, who has served as a member of the company's Board of Directors since 2015 and resigned from that position concurrently with Mr. Fong's appointment.