News Release

NYMEX to Change Margins for Natural Gas Basis Swap Futures Contracts

Thu Aug 31 2006

NEW YORK, NY, August 31, 2006 — The New York Mercantile Exchange, Inc. today announced margin changes for several of its natural gas basis swap futures contracts at the close of business tomorrow.

Margins for the first month of the ANR Oklahoma basis swap futures contract will increase to $1,250 from $1,000 for clearing members, to $1,375 from $1,100 for members, and to $1,688 from $1,350 for customers. The margins for all other months will remain the same.

The margins for the first month of the Houston Ship Channel basis swap futures contract will increase to $1,000 from $800 for clearing members, to $1,100 from $880 for members, and to $1,350 from $1,080 for customers. Margins for all other months will remain unchanged.

Margins for the first month of the San Juan basis swap futures contract will increase to $1,200 from $800 for clearing members, to $1,320 from $880 for members, and to $1,620 from $1,080 for customers. The margins for the second month will increase to $800 from $750 for clearing members, to $880 from $825 for members, and to $1,080 from $1,013 for customers. Margins for all other months will remain the same.

Margins for the first month of the SoCal basis swap futures contract will increase to $1,400 from $1,000 for clearing members, to $1,540 from $1,100 for members, and to $1,890 from $1,350 for customers. The margins for all other months will remain the same.

The margins for the first month of the Waha basis swap and PGE&E Malin basis swap futures contracts 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. Margins for all other months will remain unchanged.

Margins for the first month of the Texas Eastern Zone M-3 basis swap futures contract will decrease to $400 from $500 for clearing members, to $440 from $550 for members, and to $540 from $675 for customers. The margins for all other months will remain the same.

The margins for the first month of the Northern Natural Gas Demarcation basis swap futures contract will increase to $900 from $800 for clearing members, to $990 from $880 for members, and to $1,215 from $1,080 for customers. Margins for all other months will remain unchanged.

Margins for the first month of the Panhandle basis swap futures contract will increase to $1,000 from $600 for clearing members, to $1,100 from $660 for members, and to $1,350 from $810 for customers. The margins for all other months will remain the same.

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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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