From a seasonal standpoint option expiration week is often a pretty good week for the market. October is one of those months where it has been especially good over the years. The study below examines performance during October op-ex week.

I decided to exclude 2008 because action that week was such an incredible outlier that it greatly skewed all the stats. (The week started with an 11.5% gain on Monday of 2008.) Results 1-4 days out look pretty solid. So the bulls appear to have some seasonal forces on their side this week.
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