Quote from velosoandre:
As much as MF Global situation erases people's trust, your SIPC fear in this case is entirely unfounded.
I encourage you to contact SIPC by phone or e-mail via asksipc@sipc.org to check Interactive Brokers' statement on SIPC coverage of forex and of cash swept from commodities sub-accounts.
In the meantime, please read this statement from SIPC which has been posted elsewhere on ET.
See page 4 of this comment letter:
http://www.sec.gov/comments/s7-08-07/s70807-16.pdf
"Under SIPA, a customer's claim for "cash" derives from a few sources. One, the "cash" arises from the broker's sale of securities for the account of the customer. Two, the "cash" has been deposited by the customer with the broker for the purpose of purchasing securities. Three, the cash consists of dividends or other return generated on securities held by the broker for the customer. 15 U.S.C. $78lJ(2). Key is the fact that the cash owed by the broker to the customer is on deposit in connection with the purchase or sale of a "security," as defined in SPA. The facile labelling of an asset as "cash"does not transform it into a protected asset if unrelated to the purchase or sale of a "security."
-and-
"By the same token, the close-out of futures contracts and the valuing of options on futures contracts does not yield cash resulting from the purchase or sale of a "security." Margin deposited to secure a futures position is not cash on deposit in connection with a "security" trade."
From this thread: http://www.elitetrader.com/vb/showthread.php?s=&threadid=234850&perpage=6&pagenumber=3