The Wilshire 4500 Completion Index, more commonly the Wilshire 4500, is a capitalization-weighted index of all stocks actively traded in the United States with the exception of the stocks included in the S&P 500 index.
Many managers of small-cap and mid-cap funds use the Wilshire 4500 as a performance benchmark.
The Thrift Savings Plan's small-cap fund used this index, although it now tracks the Dow Jones U.S.
Completion Total Stock Market Index.
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