Contact: Investor Relations ir@bsig.com (617) 369-7300 Exhibit 99.1 BrightSphere Reports Financial and Operating Results for the First Quarter Ended March 31, 2023 • U.S. GAAP earnings per share of $0.28 for the quarter, compared to$0.53 for Q1'22 • U.S. GAAP net income attributable to controlling interests of $12.0 million for the quarter, compared to$23.8 million for Q1'22 • ENI earnings per share of $0.28 for the quarter, compared to$0.52 for Q1'22 • Third straight quarter of positive net flows with $ ...