What is Option Pain?
In the option market, wealth transfer between option buyers and sellers is a zero-sum game. On option expiration days, the underlying stock price often moves toward a point that brings maximum loss to option buyers. This specific price, calculated based on all outstanding options in the market, is called Option Pain. Option Pain is a proxy for the stock price manipulation target by the option selling group.
http://www.optionpain.com/MaxPain/Max-Pain.php
