NEW YORK (TheStreet) -- As monthly expiration continues to inch closer we begin to see some interesting phenomena in the markets. Maybe phenomena isn't the right word as it's fairly obvious what's going on, but not everyone is aware of how open interest can effect a market heading into expiration, especially quarterly or "witching" expirations. I spoke about open interest in more detail in yesterday's Big Idea.
Looking at the open interest shown in today's Standard & Poor's 500
SPX Open Interest
Rather than try to find a one-day opportunity to try and get decay from this idea, I'm going to step out into July for a new position on SPDR Healthcare ETF (XLV). It is setting up with a fresh daily squeeze and I think the signal should be good for a test of the old highs at least, a breakout from these levels wouldn't bother me either. I'm going to open my bid for the July 73 call at $2.20 and be willing to add to the position should we find it cheaper next week.