BNY Mellon MidCap Index Fund Class I (DMIDX) is a mutual fund that seeks to replicate as closely as possible the total return performance of the S&P MidCap 400 Index, before deducting fees and expenses. The fund invests at least 80% of its assets in the common stocks included in the S&P MidCap 400 Index; employs a replication strategy by investing substantially all of its assets in the stocks comprising the index in their respective weights; and may invest in exchange-traded funds, futures contracts, and swap agreements to manage cash flows or mitigate tracking error. It operates within the U.S. equity mid-cap segment, targeting institutional and retail investors seeking diversified exposure to mid-sized companies across various sectors including industrials, financials, consumer discretionary, information technology, and health care. The fund is managed by BNY Mellon Investment Adviser, Inc., a subsidiary of The Bank of New York Mellon Corporation, founded in 1784 and headquartered in New York City, with global operations spanning North America, Europe, Asia-Pacific, and other regions through its parent company's network. Recent developments include enhancements to its portfolio management techniques amid market volatility in 2024-2025, such as increased use of derivatives for efficient cash management following regulatory updates; integration of ESG screening options in line with BNY Mellon's sustainable investing framework launched in late 2024; and a strategic alliance with index provider S&P Dow Jones Indices to refine tracking methodologies, announced in early 2025, aimed at reducing expense ratios and improving liquidity for Class I shares.