News Release

NYMEX to Change Margins for RBOB Gasoline, Related Futures Contracts

Mon May 21 2007

NEW YORK, N.Y., May 21, 2007 — The New York Mercantile Exchange, Inc. today announced margin changes for the RBOB gasoline, RBOB financial, RBOB calendar swap, and NYMEX miNYTM RBOB futures contracts, beginning at the close of business tomorrow.

Margins for the first month of the RBOB, RBOB financial, and RBOB calendar swap futures contracts will increase to $7,000 from $6,000 for clearing members, to $7,700 from $6,600 for members, and to $9,450 from $8,100 for customers. Margins for the second to eighth months will increase to $5,750 from $5,000 for clearing members, to $6,325 from $5,500 for members, and to $7,763 from $6,750 for customers. Margins for all other months will remain the same.

Margins for the first month of the NYMEX miNY RBOB 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. Margins for the second to eighth months will increase to $2,875 from $2,500 for clearing members, to $3,163 from $2,750 for members, and to $3,881 from $3,375 for customers. Margins for all other months 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  Keil Decker, 212-299-2209

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