In October of 1990, the Commission approved CBOE rules governing the trading of stocks, warrants, and other securities at CBOE (which are now set forth in Chapter 30 of the CBOE's Rules). [ 8 ] During the process of obtaining this approval, CBOE noted to the Commission that no side-by-side trading of stocks and stock options would occur on the same floor, and agreed to submit a proposed rule change under section 19(b) of the Act [ 9 ] to the Commission "prior to any modification to its plan to trade stocks in a separate location from the options trading floor." [ 10 ] In addition, Exchange Rule 30.18(a), as proposed by the CBOE and approved by the Commission, was "intended to prevent a member from buying or selling an underlying stock on the CBOE when the member or an affiliate has a position in an option or warrant on that security." [ 11 ]