News Release

NYMEX to Change Margins for Natural Gas, Related Futures Contracts

Tue Feb 26 2008

NEW YORK, NY, February 26, 2008 -- The New York Mercantile Exchange, Inc. today announced margin changes for its natural gas; Henry Hub swap, swing swap and penultimate swap; 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 month of the natural gas, natural gas penultimate financial, and natural gas last day financial futures contracts will increase to $5,500 from $5,000 for clearing members, to $6,050 from $5,500 for members, and to $7,425 from $6,750 for customers. The margins for the second month will increase to $5,250 from $4,750 for clearing members, to $5,775 from $5,225 for members, and to $7,088 from $6,413 for customers. Margins for the third to sixth months will increase to $5,250 from $4,250 for clearing members, to $5,775 from $4,675 for members, and to $7,088 from $5,738 for customers. Margins for the seventh to 12th months will increase to $5,500 from $4,500 for clearing members, to $6,050 from $4,950 for members, and to $7,425 from $6,075 for customers.  Margins for the 13th to 18th months will increase to $3,750 from $3,500 for clearing members, to $4,125 from $3,850 for members, and to $5,063 from $4,725 for customers.  The margins for the 19th to 24th months will increase to $4,000 from $3,750 for clearing members, to $4,400 from $4,125 for members, to $5,400 from $5,063 for customers. Margins for the 25th to 36th months will increase to $3,500 from $3,250 for clearing members, to $3,850 from $3,575 for members, and to $4, 725 from $4,388 for customers. The margins for the 37th to 48th months will increase to $3,250 from $3,000 for clearing members, to $3,575 from $3,300 for members, and to $4,388 from $4,050 for customers. The margins for all other months will increase to $2,750 from $2,500 for clearing members, to $3,025 from $2,750 for members, and to $3,713 from $3,375 for customers.

The margins for the first month of the NYMEX miNY natural gas and Henry Hub swap and penultimate swap futures contracts will increase to $1,375 from $1,250 for clearing members, to $1,513 from $1,375 for members, and to $1,865 from $1,688 for customers. The margins for the second month will increase to $1,313 from $1,188 for clearing members, to $1,444 from $1,306 for members, and to $1,772 from $1,603 for customers. Margins for the third to sixth months will increase to $1,313 from $1,063 for clearing members, to $1,444 from $1,169 for members, and to $1,772 from $1,434 for customers. Margins for the seventh to 12th months will increase to $1,375 from $1,125 for clearing members, to $1,513 from $1,238 for members, and to $1,856 from $1,519 for customers. The margins for the 13th to 18th months will increase to $938 from $875 for clearing members, to $1,031 from $963 for members, and to $1,266 from $1,181 for customers.  Margins for the 19th to 24th months will increase to $1,000 from $938 for clearing members, to $1,100 from $1,031 for members, and to $1,350 from $1,266 for customers. The margins for the 25th to 36th months will increase to $875 from $813 for clearing members, to $963 from $894 for members, and to $1,181 from $1,097 for customers. Margins for the 37th to 48th months will increase to $813 from $750 for clearing members, to $894 from $825 for members, and to $1,097 from $1,013 for customers. The margins for all other months will increase to $688 from $625 for clearing members, to $756 from $688 for members, and to $928 from $844 for customers.

The margins for the Henry Hub swing swap futures contracts will increase to $1,375 from $1,250 for clearing members, to $1,513 from $1,375 for members, and to $1,856 from $1,688 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: Steffanie Marchese, 212-299-2455 or Keil Decker, 212-299-2209

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