Vanguard U.S. 500 Stock Index Fund Institutional Plus USD Acc (0P00011OE4) is a passively managed open-ended investment company that employs an indexing approach to track the performance of the Standard & Poor's 500 Index, a benchmark comprising large-capitalization U.S. equities; it invests all or substantially all of its assets in the constituent stocks of the Index in identical proportions using a full replication strategy. The Fund offers accumulation shares that reinvest dividends, targets institutional investors with a high minimum initial investment, and maintains a low ongoing charge of 0.06%, with top holdings including NVIDIA Corp, Apple Inc, and Microsoft Corp as of late 2025. Domiciled in Ireland and managed by Vanguard Global Advisers, LLC's U.S. Equity Index Team on behalf of issuer Vanguard Group (Ireland) Limited, founded in 1997 and headquartered at 70 Sir John Rogerson's Quay, Dublin 2, the share class launched on December 19, 2013, and operates across Europe including the UK, Germany, and Switzerland. The Fund focuses on the U.S. Large-Cap Blend Equity segment, serving professional and institutional clients seeking low-cost exposure to the North American equity market. In recent developments, Vanguard has pursued strategic expansions including the 2024 reopening of PRIMECAP Fund and PRIMECAP Core Fund to all investors after long closures, the November 2025 launch of three new active equity ETFs (Vanguard Wellington U.S. Value Active ETF, U.S. Growth Active ETF, and Dividend Growth Active ETF), and a May 2025 alliance with Wellington Management and Blackstone to introduce public/private-markets products like the WVB All Markets Fund.