NEW YORK, N.Y., February 23, 2007 — The New York Mercantile Exchange, Inc. today announced margin rates the 10 new cash-settled diesel swap futures contracts that will begin trading on February 25 for trade date February 26.

Margins for the Gulf Coast low sulfur diesel, Gulf Coast ultra low sulfur diesel, New York low sulfur diesel, and New York ultra low sulfur diesel swap futures contracts will be $4,250 for clearing members, $4,675 for members, and $5,738 for customers.

The margins for the Gulf Coast low sulfur diesel, Gulf Coast ultra low sulfur diesel, New York low sulfur diesel, and New York ultra low sulfur diesel crack spread swap futures contracts will be $3,500 for clearing members, $3,850 for members, and $4,725 for customers.

The margins for the Up-down Gulf Coast low sulfur diesel vs NYMEX heating oil and the Up-down Gulf Coast ultra low sulfur diesel vs NYMEX heating oil spread swap futures contracts will be $1,000 for clearing members, $1,100 for members, and $1,350 for customers.

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, NYMEX, 212-299-2436 or  Keil Decker, NYMEX, 212-299-2209