Vanguard Mid-Cap Index Fund Institutional Plus Shares (VMCPX) is an open-end mutual fund that employs an indexing investment approach designed to track the performance of the CRSP US Mid Cap Index, a broadly diversified benchmark representing medium-size U.S. companies. The fund seeks to replicate the target index by investing all or substantially all of its assets in the index's constituent stocks, holding each in approximately the same proportion as its index weighting; it maintains a portfolio concentrated in U.S. equities (approximately 98.8%), with minor allocations to non-U.S. stocks (around 1%) and cash equivalents (under 0.3%), diversified across sectors including industrials (19.1%), consumer discretionary (15.5%), financials (13.9%), technology (12.6%), utilities (9.3%), and others. Top holdings as of recent data include Amphenol Corp., Constellation Energy Corp., Arthur J. Gallagher & Co., TransDigm Group Inc., and Motorola Solutions Inc., collectively comprising about 9.6% of total net assets, which stood at $18.875 billion as of April 2025 with an expense ratio of 0.03% and a turnover rate of 15.9%.
Launched on December 15, 2010, the fund is managed by The Vanguard Group, Inc., headquartered in Malvern, Pennsylvania, and primarily serves institutional investors subject to a minimum initial investment of $100 million; it operates within the mid-cap blend category, targeting mid-capitalization stocks ranked between the 70th and 85th percentile of total U.S. market capitalization.
In recent developments, the fund has adhered closely to its benchmark, delivering a one-year total return of approximately 13.12% and a 10-year average annual return of 11.40% as of September 30, 2025, amid broader Vanguard initiatives such as the expansion of its Investor Choice program in late 2024 and the launch of new active fixed income ETFs like Vanguard Core Tax-Exempt Bond ETF and Vanguard Short Duration Tax-Exempt Bond ETF in November 2024; no fund-specific acquisitions, partnerships, or structural changes were reported in the last 1-2 years, reflecting its passive indexing strategy with quarterly rebalances spread over five days to minimize trading costs and market impact.