News Release

Exchange to Change Margins on Petroleum Futures Contracts on NYMEX ClearPort®

Thu Feb 23 2006

NEW YORK, N.Y., February 23, 2006 — The New York Mercantile Exchange, Inc., today announced margin changes for its NYMEX ClearPortClearPort® petroleum product and spread futures contracts, as of the close of business tomorrow.

Margins for the east–west fuel oil spread swap futures contract will increase to $5,000 from $1,700 for clearing members, to $5,500 from $1,870 for members, and to $6,750 from $2,295 for customers. Intra–commodity spread margins will increase to $1,000 from $340 for clearing members, to $1,100 from $374 for members, and to $1,350 from $459 for customers.

Margins for the high–low sulfur fuel oil spread swap futures contract will increase to $10,000 from $1,700 for clearing members, to $11,000 from $1,870 for members, and to $13,500 from $2,295 for customers. Intra–commodity spread margins will increase to $1,000 from $340 for clearing members, to $1,100 from $374 for members, and to $1,350 from $459 for customers.

Margins for the WTI–brent crude oil spread calendar swap futures contract will increase to $500 from $250 for clearing members, to $550 from $275 for members, and to $675 from $338 for customers. Intra–commodity spread margins will be $50 for clearing members, to $55 for members, and to $68 for customers.

Margins for the Singapore gasoil calendar swap 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. Intra–commodity spread margins will increase to $400 from $250 for clearing members, to $440 from $275 for members, and to $540 from $338 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: Brenda Guzman , 212-299-2436

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