ETF Symbol: Price 83.78 Volume 218600 Avg Vol 737760 RSf 35.8 $Vol(21d) 48m 52 wk High 93.53 52 wk Low 70.00 (as of 2010-09-09) Total Returns: 1 day 0.8% 5 day 3.6% 1 month -0.6% 3 month 4.3% 6 month -7.8% 9 month 6.4% 1 year 4.4%   Compare Funds: Correlated Group: US Brd Mkt (View cGroup) (All Groups)

Correlated Funds

Most Correlated   Least Correlated SPDR BioTech ETF XBI 0.96 Direxion Daily Mid Cap Bear 3X Shares MWN -0.86 First Tr Amex Biotech Inx Fd FBT 0.92 Proshares UltraShort Midcap 400 MZZ -0.88 iShares Dow Jones U.S. Pharmaceuticals IHE 0.92 ProShares UltraPro Short MidCap400 SMDD -0.88 Vanguard Health Care VHT 0.91 ProShares Short Midcap 400 MYY -0.88 PowerShares Dynamic Healthcare PTH 0.90 Direxion Small Cap Bear 3X Shares TZA -0.88 iShares Dow Jones U.S. Healthcare Fund IYH 0.90 Proshares Short Russell 2000 RWM -0.88 iShares Russell 2000 Growth Index Fund IWO 0.89 Proshares UltraShort Russell2000 TWM -0.88 SPDR Dow Jones U.S. Small Cap Growth Index Fund DSG 0.89 Proshares UltraShort SmallCap600 SDD -0.89 Vanguard Extended Market VXF 0.89 Proshares Short SmallCap600 SBB -0.89 Vanguard Small-Cap Growth VBK 0.89 Proshares UltraShort Russell2000 Growth SKK -0.89

These 126 day (6 month) correlations can be considered short term, focusing on recent price movements. Correlations are only calculated for actively traded funds. As of: 2010-09-03.

Exchange-traded funds are similar to index funds that trade like a single stock. Until the advent of the ETF, it was impossible to trade indexes this easily through an equity account. Most ETFs are relatively static in make-up, like the SPY or QQQQ index funds. Others, like some of the PowerShares funds, are dynamic and the holdings are changed routinely. ETFs have risks similar to stocks in that their value can rise or fall at the discretion of the marketplace. Some ETFs, like international funds and narrowly based indexes, have special risks that the investor should be aware of. However, used properly ETFs can provide an efficient and effective investment vehicle for achieving results that were near impossible for the typical investor to achieve prior to their development.