383655dd_s_Relating_to_Security_Futures__Description_of_Offset
[0] 1 Individual stock or narrow-based security index [Initial Margin Requirement] 20% of the current market value of the security future. 20% of the current market value of the security future. [Description of Offset] 
Long security future or short security future
Final Rule: Customer Margin Rules Relating to Security Futures