News Release

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

Thu Feb 08 2007

NEW YORK, N.Y., February 8, 2007 — The New York Mercantile Exchange, Inc. today announced margin and intra-commodity margin changes for several of its natural gas basis and index swap futures contracts at the close of business tomorrow.

Margins for the first month of the Sonat natural gas basis swap futures contract will increase to $250 from $125 for clearing members, to $275 from $138 for members, and to $338 from $169 for customers. The margins for all other months will remain the same.

Margins for the first month of the Demarcation, Dominion, Henry Hub, and NGPL Tex/OK index swap futures contract will remain the same. The margins for the second month will decrease to $250 from $1,500 for clearing members, to $275 from $1,650 for members, and to $338 from $2,025 for customers. Margins for all other months will be $100 for clearing members, $110 for members, and $135 for customers.

The margins for the first month of the Socal index swap futures contract will remain the same. Margins for the second month will decrease to $250 from $600 for clearing members, to $275 from $660 for members, and to $338 from $810 for customers. The margins for all other months will be $100 for clearing members, $110 for members, and $135 for customers.

The margins for the first and second month of the CenterPoint, Chicago, Dawn, Tetco M-3, Waha, and Ventura index swap futures contract will remain unchanged. Margins for all other months will be $100 for clearing members, $110 for members, and $135 for customers

The margins for the first month of the San Juan index swap futures contract will increase to $2,000 from $1,800 for clearing members, to $2,200 from $1,980 for members, and to $2,700 from $2,430 for customers. Margins for the second month will decrease to $250 from $1,500 for clearing members, to $275 from $1,650 for members, and to $338 from $2,025 for customers. The margins for all other months will be $100 for clearing members, $110 for members, and $135 for customers.

Margins for the first month of the PG&E City Gate index swap futures contract will increase to $2,000 from $1,500 for clearing members, to $2,200 from $1,650 for members, and to $2,700 from $2,025 for customers. The margins for the second month will decrease to $250 from $1,500 for clearing members, to $275 from $1,650 for members, and to $338 from $2,025 for customers. Margins for all other months will be $100 for clearing members, $110 for members, and $135 for customers.

The margins for the first month of the El Paso/Permian index swap futures contract will remain the same. Margins for the second month will decrease to $250 from $700 for clearing members, to $275 from $770 for members, and to $338 from $945 for customers. The margins for all other months will be $100 for clearing members, $110 for members, and $135 for customers.

Margins for the first month of the Houston Ship Channel, Sumas and Panhandle index swap futures contract will remain unchanged. Margins for the second month will decrease to $250 from $1,000 for clearing members, to $275 from $1,100 for members, and to $338 from $1,350 for customers. The margins for all other months will be $100 for clearing members, $110 for members, and $135 for customers.

The margins for the first month of the Rockies index swap futures contract will remain the same. Margins for the second month will decrease to $250 from $1,250 for clearing members, to $275 from $1,375 for members, and to $338 from $1,688 for customers. The margins for all other months will be $100 for clearing members, $110 for members, and $135 for customers.

Margins for the first month of the Transco Zone 6 index swap futures contract will increase to $4,000 from $3,000 for clearing members, to $4,400 from $3,300 for members, and to $5,400 from $4,050 for customers. The margins for the second month will decrease to $250 from $2,500 for clearing members, to $275 from $2,750 for members, and to $338 from $3,375 for customers. Margins for all other months will be $100 for clearing members, $110 for members, and $135 for customers.

The margins for the first month of the ANR OK and NGPL Mid-Continent index swap futures contract will remain the same. Margins for the second month will increase to $250 from $100 for clearing members, to $275 from $110 for members, and to $338 from $135 for customers. The margins for all other months will be $100 for clearing members, $110 for members, and $135 for customers.

Intra–commodity spread margins for index swap futures contracts will remain unchanged for the first and second months. Intra–commodity spread margins for all other months will be $25 for clearing members, $28 for members, and $34 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

Corporate Communications

+1 312 930 3434
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