News Release

NYMEX to Change Margins for Natural Gas Basis Swap Futures Contracts

Tue Apr 17 2007

NEW YORK, NY, April 17, 2007 — The New York Mercantile Exchange, Inc. today announced margin changes for some of its natural gas basis swap futures contracts, effective at the close of business tomorrow.

Margins for the first month of the Texas Eastern Zone M–3 basis swap futures contract will decrease to $200 from $800 for clearing members, to $220 from $880 for members, and to $270 from $1,080 for customers. The margins for the second to fifth months will decrease to $250 from $600 for clearing members, to $275 from $660 for members, and to $338 from $810 for customers. Margins for the sixth to tenth months will be $400 for clearing members, $440 for members, and $540 for customers. The margins for the 11th to 17th months will be $200 for clearing members, $220 for members, and $270 for customers. Margins for all other months will be $250 for clearing members, $275 for members, and $338 for customers.

Intra–commodity spread margins for the first to fifth months of the Texas Eastern Zone M–3 basis swap futures contract will remain the same. The intra–commodity spread margins for all other months will be $25 for clearing members, $28 for members, and $34 for customers.

Margins for the first month of the Transco Zone 6 basis swap futures contract will decrease to $200 from $1,500 for clearing members, to $220 from $1,650 for members, and to $270 from $2,025 for customers. The margins for the second to fifth months will decrease to $300 from $900 for clearing members, to $330 from $990 for members, and to $405 from $1,215 for customers. Margins for all other months will remain unchanged.

Intra–commodity spread margins for the Transco Zone 6 basis swap futures contract will remain the same.

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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: Brenda Guzman , 212-299-2436 or  Keil Decker, 212-299-2209

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