News Release

Exchange to Decrease Margins for Natural Gas and Related Futures Contracts

Thu Oct 06 2005

NEW YORK, N.Y., October 6, 2005 —The New York Mercantile Exchange, Inc., today announced that it will decrease margins for its natural gas futures, Henry Hub swap futures, NYMEX miNYsm natural gas futures, Henry Hub swing swap futures, and Henry Hub penultimate swap futures contracts, effective at the close of business on October 7.

Margins on the first month of the natural gas futures contract will decrease to $13,000 from $16,000 for clearing members; to $14,300 from $17,600 for members; and to $17,550 from $21,600 for customers. The margins on the second month will decrease to $14,000 from $15,000 for clearing members; to $15,400 from $16,500 for members; and to $18,900 from $20,250 for customers.

The margins on the first month of the Henry Hub swap and Henry Hub penultimate swap futures contracts will decrease to $3,250 from $4,000 for clearing members; to $3,575 from $4,400 for members; and to $4,388 from $5,400 for customers. The margins on the second month will decrease to $3,500 from $3,750 for clearing members; to $3,850 from $4,125 for members; and to $4,725 from $5,063 for customers.

Margins on the first month of the NYMEX miNYsm natural gas futures contract will decrease to $6,500 from $8,000 for clearing members; to $7,150 from $8,800 for members; and to $8,775 from $10,800 for customers. Margins for the second month will decrease to $7,000 from $7,500 for clearing members; to $7,700 from $8,250 for members; and to $9,450 from $10,125 for customers.

Margins on first month of the Henry Hub swing swap futures contracts will decrease to $3,250 from $4,000 for clearing members; to $3,575 from $4,400 for members; and to $4,388 from $5,400 for customers.

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Forward Looking and Cautionary Statements
This press release may contain forward–looking statements within the meaning of the Private Securities Litigation Reform Act, with respect to our future performance, operating results, strategy, and other future events. Such statements generally include words such as could, can, anticipate, believe, expect, seek, pursue, and similar words and terms, in connection with any discussion of future results. Forward–looking statements involve a number of assumptions, risks, and uncertainties, any of which may cause actual results to differ materially from the anticipated, estimated, or projected results referenced in forward–looking statements. In particular, the forward–looking statements of NYMEX Holdings, Inc., and its subsidiaries are subject to the following risks and uncertainties: the success and timing of new futures contracts and products; changes in political, economic, or industry conditions; the unfavorable resolution of material legal proceedings; the impact and timing of technological changes and the adequacy of intellectual property protection; the impact of legislative and regulatory actions, including without limitation, actions by the Commodity Futures Trading Commission; and terrorist activities and international hostilities, which may affect the general economy as well as oil and other commodity markets. We assume no obligation to update or supplement our forward–looking statements.

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