Introduced in 1991, S&P MidCap 400 is now the most widely used index for mid-sized companies. Today, mid caps are being recognized as an independent asset class, with risk/reward profiles that differ considerably from both large-caps and small-caps. S&P MidCap 400 is a core component of the U.S. indices that could be used as building blocks for portfolio construction.

Index constituents exhibit the following characteristics:

• Market Coverage – Over 7% of the U.S. equities market
• Weighting – Market capitalization
• Market Capitalization – US$ 750 million to US$ 3.3 billion
• Public Float – At least 50%
• Reconstitution – As needed basis

Index Governance and Policy
This index is maintained by the S&P Index Committee, whose members include Standard & Poor's economists and index analysts. It follows a set of published guidelines and policies that provide the transparent methodologies used to maintain the index.

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