Standard & Poor's MidCap 400 Index

A market capitalization-weighted benchmark index made up of 400 securities with market values between $200 million and $5 billion.

Standard & Poor's MidCap 400 Index

A stock index that tracks 400 publicly-traded companies with a medium amount of market capitalization. While not as well-known as the S&P 500 index, the S&P Midcap 400 is considered a leading index on mid-cap companies. Mid-cap SPDRs are depository receipts that track the S&P Midcap 400.

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