Boston Partners All-Cap Value Fund Institutional Class Investor Class R6 Class Convertible Securities Risk Cyber Security Risk Equity Securities Risk Foreign Custody Risk Foreign Securities Risk Illiquid Investments Risk IPO Risk Large-Cap Companies Risk Management Risk Market Risk Micro-Cap Companies Risk Mid-Cap Companies Risk Options Risk Small-Cap Companies Risk Russell 3000® Total Return Index (reflects no deduction for fees, expenses or taxes) Russell 3000® Value Index (reflects no deduction for fees, expenses or taxes) Boston Partners Global Equity Fund Institutional Class R6 Class Currency Risk Derivatives Risk Emerging Markets Risk Exchange-Traded Fund Risk REITs Risk Securities Lending Risk MSCI World Index - Gross Return (reflects no deduction for fees, expenses or taxes) MSCI World Index - Net Return (reflects no deduction for fees, expenses or taxes) Boston Partners Long/Short Equity Fund Institutional Class Investor Class High Yield Debt Obligations Risk Short Sales Risk Unseasoned Issuers Risk S&P 500® Index (reflects no deduction for fees, expenses or taxes) Boston Partners Long/Short Research Fund Investor Class Institutional Class Indexed Securities Risk S&P 500® Index (reflects no deduction for fees, expenses or taxes) Boston Partners Small Cap Value Fund II Institutional Class Investor Class R6 Class Russell 3000® Total Return Index (reflects no deduction for fees, expenses or taxes) Russell 2000® Value Index (reflects no deduction for fees, expenses or taxes) WPG Partners Select Small Cap Value Fund Institutional Class OTC Risk Portfolio Turnover Risk Rights and Warrants Risk Special Situations Risk Russell 3000® Total Return Index (reflects no deduction for fees, expenses or taxes) Russell 2000® Value Benchmark Total Return Index (reflects no deduction for fees, expenses or taxes) WPG Partners Small Cap Value Diversified Fund Institutional Class Russell 3000® Total Return Index (reflects no deduction for fees, expenses or taxes) Russell 2000® Value Benchmark Total Return Index (reflects no deduction for fees, expenses or taxes) C000108834Member C000277322Member C000003001Member C000003002Member C000092912Member C000092913Member Index6Member C000002982Member C000002983Member C000277320Member Index7Member C000233246Member Index09Member C000002987Member Index11Member Index12Member