News Release

NYMEX to Change Margins for Natural Gas Index Swap Futures Contracts

Wed Aug 06 2008

New York, NY , August 6, 2008 -- The New York Mercantile Exchange, Inc. today announced margin changes for some of its natural gas basis swap futures contracts, beginning at the close of business tomorrow.

Margins for the first and second months of the SoCal natural gas index swap futures contract will increase to $2,000 from $1,800 for clearing members, to $2,200 from $1,980 for members, and to $2,700 from $2,430 for customers. The margins for the third month will increase to $400 from $200 for clearing members, to $440 from $220 for members, and to $540 from $270 for customers. Margins for all other months will remain unchanged.

The margins for the first and second months of the Dominion natural gas index swap futures contract will increase to $1,800 from $1,500 for clearing members, to $1,980 from $1,650 for members, and to $2,430 from $2,025 for customers. Margins for the third month will increase to $400 from $200 for clearing members, to $440 from $220 for members, and to $540 from $270 for customers. The margins for all other months will remain the same.

Margins for the first and second months of the PG&E Citygate natural gas index swap futures contract will increase to $2,500 from $2,000 for clearing members, to $2,750 from $2,200 for members, and to $3,375 from $2,700 for customers. The margins for the third month will increase to $400 from $200 for clearing members, to $440 from $220 for members, and to $540 from $270 for customers. Margins for all other months will remain unchanged.

The margins for the first and second months of the Henry Hub natural gas index swap futures contract will increase to $2,000 from $1,500 for clearing members, to $2,200 from $1,650 for members, and to $2,700 from $2,025 for customers. Margins for the third month will increase to $300 from $200 for clearing members, to $330 from $220 for members, and to $405 from $270 for customers. The margins for all other months will remain the same.

Margins for the first and second months of the Dawn natural gas index swap futures contract will increase to $2,000 from $1,500 for clearing members, to $2,200 from $1,650 for members, and to $2,700 from $2,025 for customers. The margins for the third month will increase to $300 from $100 for clearing members, to $330 from $110 for members, and to $405 from $135 for customers. Margins for all other months will remain the same.

The margins for the first and second months of the Houston Ship Channel natural gas index swap futures contract will increase to $1,800 from $1,200 for clearing members, to $1,980 from $1,320 for members, and to $2,430 from $1,620 for customers. Margins for the third month will increase to $300 from $200 for clearing members, to $330 from $220 for members, and to $405 from $270 for customers. The margins for all other months will remain the same.

Margins for the first and second months of the ANR Oklahoma natural gas index swap futures contract will increase to $1,800 from $1,500 for clearing members, to $1,980 from $1,650 for members, and to $2,430 from $2,025 for customers. The margins for the third month will increase to $300 from $200 for clearing members, to $330 from $220 for members, and to $405 from $270 for customers. Margins for all other months will remain the same.

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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: Brenda Guzman, 212-299-2436 or Anu Ahluwalia, 212-299-2439

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