News Release

Exchange to Increase Margins for Natural Gas and Related Futures Contracts

Thu Sep 22 2005

NEW YORK, N.Y., September 22, 2005 -- The New York Mercantile Exchange, Inc., today announced margin increases for its natural gas futures, Henry Hub swap futures, NYMEX miNY sm natural gas futures, Henry Hub swing swap futures, and Henry Hub penultimate swap futures contracts, effective at the close of business on September 23.

Margins on the first month of the natural gas futures contract will increase to $16,000 from $13,000 for clearing members; to $17,600 from $14,300 for members; and to $21,600 from $17,550 for customers. The margins on the second month will increase to $15,000 from $12,500 for clearing members; to $16,500 from $13,750 for members; and to $20,250 from $16,875 for customers. Margins on the third month will increase to $14,500 from $12,500 for clearing members; to $15,950 from $13,750 for members; and to $19,575 from $16,875 for customers. The margins on the fourth to sixth months will increase to $ 14,000 from $12,000 for clearing members; to $15,400 from $13,200 for members; and to $18,900 from $16,200

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