http://www.sec.gov/rules/sro/34-46555.htm
Customer Margin Requirements
515. General Requirements; Offsetting Positions; Exclusion for Market Makers
(i) Aggregation of Accounts and Positions. For purposes of determining margin requirements under this Rule 515, Clearing Members and, if applicable, Exchange Members shall aggregate accounts under identical ownership if such accounts fall within the same classifications of customer segregated, customer secured, special reserve account for the exclusive benefit of customers and non-segregated for margin purposes. Clearing Members and, if applicable, Exchange Members may compute margin requirements for identically owned concurrent long and short positions on a net basis.
http://www.nfa.futures.org/COMPLIANCE/publications/Margins/MarginsHandbook.pdf
Concurrent Long and Short Positions
Concurrent long and short positions are long and short positions traded on the same contract market in the same futures or options contract for the same delivery month or expiration date and, if applicable, having the same strike price.
A firm may carry concurrent long and short positions as follows (see CFTC Regulation 1.46):
⢠In domestic and foreign omnibus accounts. All positions held by domestic and foreign omnibus accounts shall be margined on a gross basis.
⢠In a hedge account in which both the long and short positions are bona fide hedge positions. Such positions shall be margined on a net basis at all exchanges.
⢠In an account or identically owned accounts in which one side is a bona fide hedge position and the other side is a speculative position. Such positions shall be margined on a net basis at all exchanges.
⢠In separate accounts for identically owned speculative concurrent long and short positions which are separately and independently controlled. Such positions shall be margined on a net basis at all exchanges.
⢠For positions margined on a net basis, no margin is required; however, the account must maintain a zero or credit net liquidating equity.
Concurrent Long and Short Hold-Open Positions
Hold-open positions are positions offset at the exchange that, for convenience and customer service purposes, have been held open on the FCMâs internal bookkeeping records. The firmâs internal bookkeeping records shall clearly indicate all hold-open positions.
As hold-open positions only remain open on the firmâs internal records and are not true exchange positions, no margin is required.