An
exchange-traded fund that tracks the Standard and Poor's Midcap 400 Composite Price Index. The organization issuing the SPDR owns each of the
stocks traded on the S&P Midcap Index in approximate ratio to their
market capitalization. SPDR
shares can be bought, sold,
short-sold,
traded on margin, and generally function as if they were stocks.
Investors use midcap SPDRs (and indeed all exchange-traded funds) as a way to easily
diversify their
portfolios at relatively low cost. Investors also see the
demand for midcap SPDRs as an indicator of which direction the market believes the S&P Midcap Index is going.