ProShares Quotes, from Alston Mabry
If you want to see some spooky quote slippage, try to get quotes from different sources (Yahoo, Google, MSN) for the newer ProShares index ETFs for the S&P, QQQQ and MidCap 400. Each fund is meant to track 200% of either the index move (QLD, MVV, SSO) or the inverse of the index move (QID, MZZ, SDS).These pairs are supposed to be opposites, but meeting the 200% target must be tougher than it looks:
QQQQ: + 1.12%
QLD: 64.67 +1.17 +1.84% 217,500
QID: 73.20 -1.50 -2.01% 374,900
MidCap 400: +0.65%
MVV: 71.63 +0.60 +0.84% 47,200
MZZ: 72.65 -0.92 -1.25% 54,700
S&P: +0.60%
SSO: 73.70 +0.56 +0.77% 73,200
SDS: 69.69 -0.82 -1.16% 137,800
Or maybe there is somebody arbitraging the heck out of this stuff!