News Release

NYMEX to Change Margins for Natural Gas Basis Swap Futures Contracts

Fri Jun 22 2007

NEW YORK, N.Y., June 22, 2007 — The New York Mercantile Exchange, Inc. today announced margin changes for some of its natural gas basis swap futures contracts at the close of business on June 25.

Margins for the first month of the CIG Rockies basis swap futures contract will remain the same. The margins for the second through sixth months will increase to $1,200 from $1,000 for clearing members, to $1,320 from $1,100 for members, and to $1,620 from $1,350 for customers. The margins for all other months will remain unchanged.

Margins for the first through sixth months of the LGPL Mid-Continent basis swap futures contract will remain the same. The margins for the seventh through 12th months will increase to $300 from $200 for clearing members, to $330 from $220 for members, and to $405 from $270 for customers. The margins for all other months will increase to $200 from $100 for clearing members, to $220 from $110 for members, and to $270 from $135 for customers.

Margins for the first month of the Northwest Pipeline, Rockies basis swap futures contract will remain the same. The margins for the second through sixth months will increase to $1,250 from $800 for clearing members, to $1,375 from $880 for members, and to $1,688 from $1,080 for customers. The 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: Brenda Guzman, 212-299-2436 or  Keil Decker, 212-299-2209

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