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Index Family:    Wilshire Style Indexes
Index Name:    The Wilshire Mid-Cap 500 Index

Measures mid-sized stocks. This cap-weighted index is a combination of 500 large and small stocks from the 501st largest in the Wilshire 5000 to the 1,000th largest, by market cap, at June 30 of each year.



  • The 501st largest stock in the Wilshire 5000 to the 1,000th largest, by market cap.
  • Follows Wilshire 5000 membership guidelines.

Adjustments and Maintenance

  • Additions to the index are made once a year in June.
  • A security will be excluded from the index at the month-end following the day it stops trading.
  • Shares outstanding may be adjusted to reflect corporate events during the quarter; otherwise, shares outstanding are updated once a quarter.

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