News Release

Exchange to Change Margins for Natural Gas, Related Futures Contracts

Thu Jan 05 2006

NEW YORK, N.Y., January 5, 2006 — The New York Mercantile Exchange, Inc., today announced margin changes for natural gas futures, Henry Hub swap futures, Henry Hub penultimate swap futures, NYMEX miNYTM natural gas futures, and Henry Hub swing swap futures contracts at the close of business on Friday.

The margins on the first two months of the natural gas futures contract 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 for all other months will remain unchanged.

The margin rates on the first two months of the Henry Hub swap and Henry Hub penultimate swap futures contracts 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 all other months will remain unchanged.

Margins for the first two months of the NYMEX miNYTM natural gas futures contract 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 for the first month of the Henry Hub swing swap futures contract will decrease to $3,000 from $3,500 for clearing members, to $3,300 form $3,850 for members, and to $4,050 from $4,725 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.

Contact: Anu Ahluwalia, 212-299-2439

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