This chart was drawn for @howardlindzon little competition to see who can guess when $goog will cross the $SPX . Looking at the correlation of $goog vs. $SPX I find this very hard to happen. Currently they have a 96.5 % correlation and $goog has approximately 65% of catch up to do. This year $goog has gained 58% ytd and the SP500 has gained 29%. If everything was fair in the world we could give this spread a 2:1 ratio. Therefore my guess of the cross-over would be December 2015.