News Release

NYMEX to Change Margins for Natural Gas, Related Futures Contracts

Tue Nov 27 2007

NEW YORK, NY, November 27, 2007 -- The New York Mercantile Exchange, Inc. today announced margin changes for its natural gas; Henry Hub swap and penultimate swap; and natural gas penultimate and last day financial; and NYMEX miNYTM natural gas futures contracts, effective at the close of business tomorrow. 

Margins for the first and second months of the natural gas, natural gas penultimate financial, and natural gas last day financial futures contracts will remain the same. The margins for the third month will decrease to $6,000 from $6,500 for clearing members, to $6,600 from $7,150 for members, and to $8,100 from $8,775 for customers. Margins for the fourth to ninth months will decrease to $5,000 from $5,500 for clearing members, to $5,500 from $6,050 for members, and to $6,750 from $7,425 for customers. The margins for the tenth to 27th months will remain unchanged. Margins for 28th to 39th months will increase to $3,500 from $3,000 for clearing members, to $3,850 from $3,300 for members, and to $4,725 from $4,050 for customers. The margins for the 40th to 51st months will increase to $3,000 from $2,500 for clearing members, to $3,300 from $2,750 for members, and to $4,050 from $3,375 for customers. Margins for all other months 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 first and second months of the NYMEX miNY, Henry Hub swap and penultimate swap futures contracts will remain the same. Margins for the third month will decrease to $1,500 from $1,625 for clearing members, to $1,650 from $1,788 for members, and to $2,025 from $2,194 for customers. The margins for the fourth to ninth months will decrease to $1,250 from $1,375 for clearing members, to $1,375 from $1,513 for members, and to $1,688 from $1,856 for customers. Margins for the tenth to 27th months will remain unchanged. The margins for 28th to 39th months will increase to $875 from $750 for clearing members, to $963 from $825 for members, and to $1,181 from $1,013 for customers. Margins for the 40th to 51st months will increase to $750 from $625 for clearing members, to $825 from $688 for members, and to $1,013 from $844 for customers. The margins for all other months will increase to $625 from $500 for clearing members, to $688 from $550 for members, and to $844 from $675 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: Brenda Guzman 212-299-2436 or Keil Decker, 212-299-2209

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