News Release

NYMEX to Change Margins for Natural Gas Basis, Index Swap Futures Contracts

Thu Feb 01 2007

NEW YORK, NY, February 1, 2007 — The New York Mercantile Exchange, Inc. today announced that it will change margins for its natural gas basis and index swap futures contracts, beginning at the close of business tomorrow.

Margins for the first month of the CIG Rockies basis swap futures contract will increase to $1,750 from $1,500 for clearing members, to $1,925 from $1,650 for members, and to $2,363 from $2,025 for customers. The margins for the second month will increase to $1,250 from $900 for clearing members, to $1,375 from $990 for members, and to $1,688 from $1,215 for customers. The margins for all other months will remain unchanged.

The margins for the first month of the Alberta Gas basis swap futures contract will increase to $1,750 from $1,200 for clearing members, to $1,925 from $1,320 for members, and to $2,363 from $1,620 for customers. Margins for the second month will increase to $1,250 from $500 for clearing members, to $1,375 from $550 for members, and to $1,688 from $675 for customers. Margins for all other months will remain the same.

Margins for the first month of the Houston Ship Channel basis swap futures contract will decrease to $750 from $900 for clearing members, to $825 from $990 for members, and to $1,013 from $1,215 for customers. Margins for all other months will remain unchanged.

The margins for the first month of the NGPL Mid-Continent basis swap futures contract will increase to $750 from $700 for clearing members, to $825 from $770 for members, and to $1,013 from $945 for customers. The margins for all other months will remain the same.

Margins for the first month of the Northwest Pipeline, Rockies basis swap futures contract will increase to $1,750 from $1,500 for clearing members, to $1,925 from $1,650 for members, and to $2,363 from $2,025 for customers. The margins for the second month 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. Margins for all other months will remain unchanged.

The margins for the first month of the Tetco Eastern South/STX basis swap futures contract will decrease to $600 from $700 for clearing members, to $660 from $770 for members, and to $810 from $945 for customers. 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. The margins for all other months will remain the same.

Margins for the first and second months of the Demarcation and PG&E City Gate index swap futures contracts will decrease to $1,500 from $2,000 for clearing members, to $1,650 from $2,200 for members, and to $2,025 from $2,700 for customers. The margins for all other months will increase to $1,500 from $700 for clearing members, to $1,650 from $770 for members, and to $2,025 from $945 for customers.

The margins for the first and second months of the SoCal index swap futures contract will decrease to $1,800 from $2,000 for clearing members, to $1,980 from $2,200 for members, and to $2,430 from $2,700 for customers. Margins for all other months will increase to $600 from $125 for clearing members, to $660 from $138 for members, and to $810 from $169 for customers.

Margins for the first and second months of the Dominion index swap futures contract will remain the same. The margins for all other months will increase to $1,500 from $100 for clearing members, to $1,650 from $110 for members, and to $2,025 from $135 for customers.

The margins for the first and second months of the San Juan index swap futures contract will remain unchanged. Margins for all other months will increase to $1,500 from $125 for clearing members, to $1,650 from $138 for members, and to $2,025 from $169 for customers.

Margins for the first and second months of the El Paso/Permian index swap futures contract will decrease to $1,500 from $2,000 for clearing members, to $1,650 from $2,200 for members, and to $2,025 from $2,700 for customers. The margins for the all other months will remain the same.

The margins for the first and second months of the Henry Hub index swap futures contract will decrease to $1,500 from $2,000 for clearing members, to $1,650 from $2,200 for members, and to $2,025 from $2,700 for customers. Margins for all other months will increase to $1,500 from $200 for clearing members, to $1,650 from $220 for members, and to $2,025 from $270 for customers.

Margins for the first and second months of the Houston Ship Channel index swap futures contract will decrease to $1,200 from $2,000 for clearing members, to $1,320 from $2,200 for members, and to $1,620 from $2,700 for customers. The margins for all other months will increase to $1,000 from $500 for clearing members, to $1,100 from $550 for members, and to $1,350 from $675 for customers.

The margins for the first and second months for the Rockies index swap futures contract will remain the same. Margins for all other months will increase to $1,250 from $375 for clearing members, to $1,375 from $413 for members, and to $1,688 from $506 for customers.

Margins for the first and second months of the Transco Zone 6 index swap futures contract will remain unchanged. The margins for all other months will increase to $2,500 from $500 for clearing members, to $2,750 from $550 for members, and to $3,375 from $675 for customers.

The margins for the first and second months for the Sumas and Panhandle index swap futures contracts will decrease to $1,500 from $2,000 for clearing members, to $1,650 from $2,200 for members, and to $2,025 from $2,700 for customers. The margins for all other months will increase to $1,000 from $125 for clearing members, to $1,100 from $138 for members, and to $1,350 from $169 for customers.

Margins for the first and second months for the TETCO M-3 index swap futures contract will remain unchanged. Margins for all other months will increase to $750 from $125 for clearing members, to $825 from $138 for members, and to $1,013 from $169 for customers.

The margins for the first and second months of the NGPL Tex/OK index swap futures contract will remain the same. Margins for all other months will increase to $1,500 from $100 for clearing members, to $1,650 from $110 for members, and to $2,025 from $135 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: Steffanie Marchese, 212-299-2455

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