1 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, 2024 • U.S. GAAP earnings per share of $0.37 for the quarter, compared to$0.28 for Q1'23 • U.S. GAAP net income attributable to controlling interests of $14.6 million for the quarter, compared to$12.0 million for Q1'23 • ENI earnings per share of $0.44 for the quarter, compared to$0.28 for Q1'23 • AUM of $110.4 billion at March 31, 2024 compared ...