News Release

NYMEX to Change Margins for Natural Gas, Related Futures Contracts

Mon Jul 28 2008

NEW YORK, NY, July 28, 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 and second months of the natural gas, natural gas penultimate financial, and natural gas last day financial futures contracts will remain unchanged. The margins for the third to seventh months will decrease to $8,750 from $9,000 for clearing members, to $9,625 from $9,900 for members, and to $11,813 from $12,150 for customers. Margins for the eighth to 14th months will decrease to $5,500 from $9,250 for clearing members, to $6,050 from $10,175 for members, and to $7,425 from $12,488 for customers.  The margins for the 15th to19th months will decrease to $5,750 from $6,000 for clearing members, to $6,325 from $6,600 for members, and to $7,763 from $8,100 for customers. Margins for the 20th to 31st months will decrease to $4,250 from $6,000 for clearing members, to $4,675 from $6,600 for members, and to $5,738 from $8,100 for customers.  The margins for the 32nd to 43rd months will decrease to $4,000 from $4,750 for clearing members, to $4,400 from $5,225 for members, and to $5,400 from $6,413 for customers. Margins for the 44th to 55th months will decrease to $3,750 from $4,500 for clearing members, to $4,125 from $4,950 for members, and to $5,063 from $6,075 for customers. Margins for all other months will decrease to $3,500 from $4,000 for clearing members, to $3,850 from $4,400 for members, and to $4,725 from $5,400 for customers.

The margins for the first and second months of the NYMEX miNY natural gas and Henry Hub swap and penultimate swap futures contracts will remain unchanged. Margins for the third to seventh months will decrease to $2,188 from $2,250 for clearing members, to $2,406 from $2,475 for members, and to $2,953 from $3,038 for customers. Margins for the eighth to 14th months will decrease to $1,375 from $2,313 for clearing members, to $1,513 from $2,544 for members, and to $1,856 from $3,122 for customers.  The margins for the 15th to 19th months will decrease to $1,438 from $1,500 for clearing members, to $1,581 from $1,650 for members, and to $1,941 from $2,025 for customers. Margins for the 20th to 31st months will decrease to $1,063 from $1,500 for clearing members, to $1,169 from $1,650 for members, and to $1,434 from $2,025 for customers.  The margins for the 32nd to 43rd months will decrease to $1,000 from $1,188 for clearing members, to $1,100 from $1,306 for members, and to $1,350 from $1,603 for customers. Margins for the 44th to 55th months will decrease to $938 from $1,125 for clearing members, to $1,031 from $1,238 for members, and to $1,266 from $1,519 for customers. Margins for all other months will decrease to $875 from $1,000 for clearing members, to $963 from $1,100 for members, and to $1,181 from $1,350 for customers.

The margins for the Henry Hub swing swap futures contract will remain unchanged.

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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:  Anu Ahluwalia, 212-299-2439 or Tara Stowe, 212-299-2455

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