OneChicago, LLC (OCX) has petitioned the Commodity Futures Trading Commission and the Securities and Exchange Commission to amend CFTC Rule 41.45(b) and SEC Rule 403(b) by reducing from 20% to 15% the minimum customer margin required to trade single stock futures and other security futures products. Section 7(c)(2) of the Securities Exchange Act of 1934 requires that the customer margin requirements for security futures be consistent with those for comparable exchange-traded securities options. OCX pointed to the SEC’s approval, on December 12, 2006, of a rule change by the Chicago Board Options Exchange that permits broker-dealers to calculate customer margin requirements on a portfolio basis, effectively reducing to 15% the margin required on listed equity options. OCX’s request seeks to reduce the margin requirement for customers carrying security futures in futures accounts regulated by the CFTC to the same 15% level.

http://www.sec.gov/rules/petitions/2008/petn4-565.pdf