News Release

Exchange to Change Margins for Copper, Aluminum Futures Contracts

Tue Aug 29 2006

NEW YORK, N.Y., August 29, 2006 — The New York Mercantile Exchange, Inc. today announced margin changes for its copper and aluminum futures contracts, beginning at the close of business tomorrow.

Margins for the copper futures contract will decrease to $6,000 from $7,000 for clearing and non-clearing members and to $8,100 from $9,450 for customers.

Margins for the aluminum futures contract will decrease to $2,500 from $3,250 for clearing and non-clearing members and to $3,375 from $4,388 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 , 212-229-2439

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