News Release

Exchange Increases Margins for Natural Gas Futures and Other Related Contracts

Tue Aug 30 2005

NEW YORK, N.Y., August 30, 2005 — The New York Mercantile Exchange, Inc., announced today it would change the margins for its natural gas, Henry Hub swap, NYMEX miNYsm natural gas, Henry Hub swing swap, and Henry Hub penultimate swap futures contracts at the close of business on August 30

Margins on the first month of the natural gas futures contracts will increase to $12,500 from $10,000 for clearing members, to $13,750 from $11,000 for members, and to $16,875 from $13,500 for customers. The margins on all other months will remain the same.

The margins on the first month of the Henry Hub swap, Henry Hub penultimate swap, and Henry Hub swing swap futures contracts will increase to $3,125 from $2,500 for clearing members, to $3,438 from $2,750 for members, and to $4,219 from $3,375 for customers. Margins on all other months will remain the same.

Margins on the first month of the NYMEX miNYsm natural gas futures contracts will increase to $6,250 from $5,000 for clearing members, to $6,875 from $5,500 for members, and to $8,438 from $6,750 for customers.

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