News Release

Exchange to Decrease Margins for Natural Gas and Related Futures Contracts

Mon Oct 17 2005

NEW YORK, N.Y., October 17, 2005 &151; 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 18.

Margins on the first month of the natural gas futures contract will decrease to $11,000 from $13,000 for clearing members; to $12,100 from $14,300 for members; and to $14,850 from $17,550 for customers. The margins on the second month will decrease to $12,000 from $14,000 for clearing members; to $13,200 from $15,400 for members; and to $16,200 from $18,900 for customers. Margins on the third month will decrease to $12,500 from $14,500 for clearing members; to $13,750 from $15,950 for members; and to $16,875 from $19,575 for customers. The margins on the fourth and fifth months will decrease to $13,000 from $14,000 for clearing members; to $14,300 from $15,400 for members; and to $17,550 from $18,900 for customers. Margins on all other months will remain unchanged.

The margins on the first month of the Henry Hub swap and Henry Hub penultimate swap futures contracts will decrease to $2,750 from $3,250 for clearing members; to $3,025 from $3,575 for members; and to $3,713 from $4,388 for customers. The margins on the second month will decrease to $3,000 from $3,500 for clearing members; to $3,300 from $3,850 for members; and to $4,050 from $4,725 for customers. Margins on the third month will decrease to $3,125 from $3,625 for clearing members; to $3,438 from $3,988 for members; and to $4,219 from $4,894 for customers. The margins on the fourth and fifth months will decrease to $3,250 from $3,500 for clearing members; to $3,575 from $3,850 for members; and to $4,388 from $4,894 for customers. Margins on all other months will remain unchanged.

Margins on the first month of the NYMEX miNYsm natural gas futures contract will decrease to $5,500 from $6,500 for clearing members; to $6,050 from $7,150 for members; and to $7,425 from $8,775 for customers. Margins for the second month will decrease to $6,000 from $7,000 for clearing members; to $6,600 from $7,700 for members; and to $8,100 from $9,450 for customers.

Margins on the Henry Hub swing swap futures contract will decrease to $2,750 from $3,250 for clearing members; to $3,025 from $3,575 for members; and to $3,713 from $4,388 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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