In this article
the author says:
Since June 24, crude prices halved while CVX has dropped only 20%. SPY has risen slightly less than 3% during that time period. What’s a good options strategy in light of all of this information? A 1X2 **over-the-counter** call ratio spread
Why does this trade need to be an over the counter trade? It is a standard call option trade with standard contract size of 100 shares. So why is it over the counter as opposed to being traded on an exchange?