News Release

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

Mon Dec 04 2006

NEW YORK, NY, December 4, 2006 — The New York Mercantile Exchange, Inc. today announced that it will change margins for its natural gas swing swap and index swap futures contracts, beginning tomorrow.

Margins for the San Juan, El Paso/Permian, and SoCal swing swap futures contracts will increase to $4,000 from $2,000 for clearing members, to $4,400 from $2,200 for members, and to $5,400 from $2,700 for customers.

The margins for the first month of the Demarcation 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. Margins for all other months will increase to $700 from $100 for clearing members, to $770 from $110 for members, and to $945 from $135 for customers.

The margins for the first month of the PG&E Citygate 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. Margins for all other months will increase to $700 from $125 for clearing members, to $770 from $138 for members, and to $945 from $169 for customers.

The margins for the first month of the El Paso/Permian index swap futures contract will remain the same. Margins for all other months will increase to $700 from $150 for clearing members, to $770 from $165 for members, and to $945 from $203 for customers.

The margins for the first month of the Henry Hub index swap futures contract will remain the same. Margins for all other months will increase to $200 from $50 for clearing members, to $220 from $55 for members, and to $270 from $68 for customers.

The margins for the first month of the Houston Ship Channel index swap futures contract will remain the same. Margins for all other months will increase to $500 from $125 for clearing members, to $550 from $138 for members, and to $675 from $169 for customers.

The margins for the first month of the Rockies index swap futures contract will increase to $4,000 from $2,500 for clearing members, to $4,400 from $2,750 for members, and to $5,400 from $3,375 for customers. Margins for all other months will remain the same.

The margins for the first month of the Sumas 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. 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

Corporate Communications

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