News Release

NYMEX to Change Margins for Some Carbon, Nitrogen Oxide Based Emission Allowance Futures Contracts

Tue Aug 05 2008

NEW YORK, N.Y., August 5, 2008 -- The New York Mercantile Exchange, Inc. today announced margin changes for some of its carbon and nitrogen oxide based emission allowance futures contracts, beginning at the close of business tomorrow.

Margins for the 2009 vintage of the annual nitrogen oxide emission allowance futures contract will increase to $9,000 from $6,000 for clearing members, to $9,900 from $6,600 for members, and to $12,150 from $8,100 for customers.

Margins for the current vintage of the seasonal nitrogen oxide emission allowance futures contract will decrease to $1,000 from $1,500 for clearing members, to $1,100 from $1,650 for members, and to $1,350 from $2,025 for customers.

Margins for the 2009 vintage of the seasonal nitrogen oxide emission allowance futures contract will increase to $1,500 from $1,200 for clearing members, to $1,650 from $1,320 for members, and to $2,025 from $1,620 for customers.

Margins for the 2010 vintage of the seasonal nitrogen oxide emission allowance futures contract will decrease to $1,000 from $750 for clearing members, to $1,100 from $825 for members, and to $1,350 from $1,013 for customers.

Margins for the 2012 vintage of the seasonal nitrogen oxide emission allowance futures contract will increase to $1,000 from $1,200 for clearing members, to $1,100 from $1,320 for members, and to $1,350 from $1,620 for customers.

Margins for the sulfur dioxide emission allowance futures contract will increase to $9,000 from $7,000 for clearing members, to $9,900 from $7,700 for members, and to $12,150 from $9,450 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: Anu Ahluwalia, 212-299-2439 or Brenda Guzman, 212-299-2436

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