Contact: Elie Sugarman ir@bsig.com (617) 369-7300 Exhibit 99.1 BrightSphere Reports Financial and Operating Results for the Fourth Quarter Ended December 31, 2022 • U.S. GAAP earnings per share of $0.72 for the quarter, compared to$0.53 for Q4'21 • ENI earnings per share of $0.67 for the quarter, compared to$0.53 for Q4'21 • U.S. GAAP net income attributable to controlling interests of $30.4 million for the quarter, compared to$39.2 million for Q4'21 • Net client cash flows ("NCCF") for the quarter of $1 ...