CME SPAN
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Standard Portfolio Analysis of Risk (SPAN) is a system for calculating margin requirements for futures and options on futures. It was developed by the Chicago Mercantile Exchange in 1988.
SPAN is a portfolio margining method that uses grid simulation. It calculates the likely loss in a set of derivative positions (also called a portfolio) and sets this value as the initial margin payable by the firm holding the portfolio. In this manner, SPAN provides for offsets between correlated positions and enhances margining efficiency.
http://www.cme.com/clearing/rmspan/span/index.html
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