Calvert US Mid-Cap Core Responsible Index is a portfolio of mid capitalization U.S. stocks that meet Calvert’s criteria for index inclusion based on Calvert Principles for Responsible Investment. Unless otherwise stated, index returns do not reflect the effect of any applicable sales charges, commissions, expenses, taxes or leverage, as applicable. The Fund seeks to generate attractive risk-adjusted long-term returns by investing in the stocks of U.S. small- and mid-cap companies with durable competitive advantages, excellent management, lower financial risk, and strong growth trajectories. The BNY Mellon MidCap Index Fund Investor Shares, formerly known as the Dreyfus Mid Cap Index Fund, tracks the performance of the Standard & Poor's MidCap 400 Index, by seeking exposure to the