News Release

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

Wed Jun 04 2008

NEW YORK, N.Y., June 4, 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 on June 6.

Margins for the European Union Allowance (EUA) futures contract will increase to €2,000 from €1,700 for clearing members, to €2,200 from €1,870 for members, and to €2,700 from €2,295 for customers.

Margins for the Certified Emission Reduction (CER) futures contract will decrease to €750 from €1,100 for clearing members, to €825 from €1,210 for members, and to €1,013 from €1,485 for customers.

Margins for the 2010 vintage of the seasonal nitrogen oxide emission allowance futures contract will increase to $900 from $600 for clearing members, to $990 from $660 for members, and to $1,215 from $810 for customers.

Margins for the 2011 vintage of the seasonal nitrogen oxide emission allowance futures contract will increase to $1,000 from $800 for clearing members, to $1,100 from $880 for members, and to $1,350 from $1,080 for customers.

Margins for the 2009 vintage of the annual nitrogen oxide emission allowance futures contract will increase to $3,500 from $2,500 for clearing members, to $3,850 from $2,750 for members, and to $4,725 from $3,375 for customers.

Margins for the 2011 vintage of the annual nitrogen oxide emission allowance futures contract will increase to $4,000 from $3,000 for clearing members, to $4,400 from $3,300 for members, and to $5,400 from $4,050 for customers.

Margins for the 2012 vintage of the annual nitrogen oxide emission allowance futures contract 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.

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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 Keil Decker, 212-299-2209

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