News Release

NYMEX to Change Margins for Natural Gas Basis Swap Futures Contracts

Thu May 31 2007

NEW YORK, NY, May 31, 2007 — The New York Mercantile Exchange, Inc. today announced that it will change margins for several of its natural gas basis swap futures contract, beginning at the close of business tomorrow, June 1.

Margins for the first to fourth months of the CIG Rockies swap futures contract will remain the same. The margins for the fifth to ninth months will decrease to $750 from $1,000 for clearing members, to $825 from $1,100 for members, and to $1,013 from $1,350 for customers. Margins for the 10th to 16th months will remain unchanged. The margins for all other months will decrease to $400 from $500 for clearing members, to $440 from $550 for members, and to $540 from $675 for customers. Margins for the first to sixth months of the Alberta gas swap futures contract will remain the same. Margins for the seventh to 12th months will decrease to $200 from $250 for clearing members, to $220 from $275 for members, and to $270 from $338 for customers. The margins for all other months will remain unchanged.

Margins for the first month of the ANR Oklahoma swap futures contract will decrease to $600 from $750 for clearing members, to $660 from $825 for members, and to $810 from $1,013 for customers. The margins for all other months will decrease to $300 from $400 for clearing members, to $330 from $440 for members, and to $405 from $540 for customers.

Margins for the first month of the Houston Ship Channel swap futures contract will decrease to $300 from $400 for clearing members, to $330 from $440 for members, and to $405 from $540 for customers. Margins for the second month will decrease to $200 from $300 for clearing members, to $220 from $330 for members, and to $270 from $405 for customers. The margins for all other months will remain unchanged.

Margins for the first month of the San Juan swap futures contract will decrease to $500 from $600 for clearing members, to $550 from $660 for members, and to $675 from $810 for customers. The margins for the second month will decrease to $300 from $400 for clearing members, to $330 from $440 for members, and to $405 from $540 for customers. The margins for the third to 12th months will remain the same. The margins for all other months will decrease to $200 from $300 for clearing members, to $220 from $330 for members, and to $270 from $405 for customers.

The margins for the first month of the NGPL Mid-Continent swap futures contract will decrease to $500 from $600 for clearing members, to $550 from $660 for members, and to $675 from $810 for customers. The margins for the second month will decrease to $400 from $500 for clearing members, to $440 from $550 for members, and to $540 from $675 for customers. Margins for the third to sixth months decrease to $300 from $400 for clearing members, to $330 from $440 for members, and to $405 from $540 for customers. The margins for the seventh to 12th months will decrease to $200 from $300 for clearing members, to $220 from $330 for members, and to $270 from $405 for customers. The margins for all other months will decrease to $100 from $300 for clearing members, to $110 from $330 for members, and to $135 from $405 for customers.

Margins for the first month of the Tennessee, Zone 0 swap futures contract will decrease to $300 from $400 for clearing members, to $330 from $440 for members, and to $405 from $540 for customers. The margins for all other months will decrease to $200 from $300 for clearing members, to $220 from $330 for members, and to $270 from $405 for customers.

The margins for the first month of the Northwest Pipeline, Rockies swap futures contract will decrease to $1,200 from $1,500 for clearing members, to $1,320 from $1,650 for members, and to $1,620 from $2,025 for customers. The margins for the second to ninth months will decrease to $800 from $1,000 for clearing members, to $880 from $1,100 for members, and to $1,080 from $1,350 for customers. The margins for the 10th to 16th months will increase to $400 from $300 for clearing members, to $440 from $330 for members, and to $540 from $405 for customers. The margins for all other months will not change.

Margins for the first month of Socal swap futures contract will decrease to $600 from $750 for clearing members, to $660 from $825 for members, and to $810 from $1,013 for customers. The margins for the second month will decrease to $400 from $500 for clearing members, to $440 from $550 for members, and to $540 from $675 for customers. Margins for the third to sixth months will decrease to $400 from $500 for clearing members, to $440 from $550 for members, and to $540 from $675 for customers. Margins for all other months will decrease from $200 to $300 for clearing members, to $220 from $330 for members, and to $270 from $405 for customers.

The margins for the first to sixth months of the Waha swap futures contract will remain the same. Margins for the seventh to 12th months will decrease to $200 from $300 for clearing members, to $220 from $330 for members, and to $270 from $405 for customers. The margins for all other months will remain unchanged.

Margins for the first to fifth months of Transco Zone 6 swap futures contract will remain unchanged. The margins for the sixth to 10th months will decrease to $500 from $750 for clearing members, to $550 from $825 for members, and to $675 from $1,013 fro customers. Margins for all other months will remain the same.

The margins for the first to fifth month of PGE&E Malin; PGE&E Citygate; Northern Natural Gas Demarcation; and Northern Natural Gas Ventura, Iowa swap futures contract will remain the same. Margins for all other months will decrease to $250 from $300 for clearing members, to $275 from $330 for members, and to $338 from $405 for customers.

Margins for the first month of the Panhandle swap futures contract will decrease to $500 from $600 for clearing members, to $550 from $660 for members, and to $675 from $810 for customers. Margins for all other months will remain unchanged.

The margins for the first month of the CenterPoint 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. Margins for all other months will decrease to $250 from $300 for clearing members, to $275 from $330 for members, and to $338 from $405 for customers.

Margins for the first to sixth months of Tetco South/STX swap futures contract will remain the same. Margins for the seventh to 12th month will decrease to $200 from $300 for clearing members, to $220 from $330 for members and to $270 from $405 for customers. Margins for all other months will decrease to $100 from $200 for clearing members, to $110 from $220 for members, and to $135 from $270 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 or  Keil Decker, 212-299-2209

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