News Release

NYMEX Announces Margins for the New Natural Gas Basis Index Swap and Swing Swap Futures Contracts

Fri May 05 2006

NEW YORK, N.Y., May 5, 2006 — The New York Mercantile Exchange, Inc., today announced margins for the 16 new natural gas swap futures contracts that will launch on May 7 for trade date May 8.

Margins for the first month of the CenterPoint natural gas basis swap and Dawn natural gas basis swap futures contracts will be $800 for clearing members; $880 for members; and $1,080 for customers. Margins on all other months will be $300 for clearing members; $330 for members; and $405 for customers. Intra–commodity spread margins on all months will be $25 for clearing members; $28 for members; and $34 for customers.

The margins for the first and second months of the CenterPoint natural gas index swap, Dawn natural gas index swap, ANR Oklahoma natural gas index swap, NGPL Mid–Con natural gas index swap, NGPL TexOk natural gas index swap, Dermarc natural gas index swap, and Verntura natural gas index swap futures contracts will be $1,500 for clearing members; $1,650 for members; and $2,025 for customers. Margins on all other months will be $100 for clearing members; $110 for members; and $135 for customers. Intra-commodity spread margins on all months will be $25 for clearing members; $28 for members; and $34 for customers.

The margins for CenterPoint natural gas swing swap, Dawn natural gas swing swap, ANR Oklahoma natural gas swing swap, NGPL Mid–Con natural gas swing swap, NGPL TexOk natural gas swing swap, Dermarc natural gas swing swap, and Ventura natural gas swing swap futures contracts will be $3,500 for clearing members; $3,850 for members; and $4,725 for customers. Intra–commodity spread margins on all months will be $100 for clearing members; $110 for members; and $135 for customers.

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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

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