News Release

NYMEX to Change Margins for Natural Gas Basis Swap Futures Contracts

Thu Nov 30 2006

NEW YORK, NY, November 30, 2006 —The New York Mercantile Exchange, Inc. today announced that it will change margins for its natural gas basis swap futures contracts, beginning tomorrow.

Margins for the first month of the Chicago 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. The margins for all other months will decrease to $500 from $600 for clearing members, to $550 from $660 for members, and to $675 from $810 for customers.

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

Margins for the first and second months of the MichCon 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 the third to fifth months 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 decrease to $400 from $550 for clearing members, to $440 from $605 for members, and to $540 from $743 for customers.

The margins for the first month of the Houston Ship Channel swap futures contract will decrease to $900 from $1,000 for clearing members, to $990 from $1,100 for members, and to $1,215 from $1,350 for customers. Margins for the second month 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 all other months will remain the same.

Margins for the first month of the San Juan swap futures contract will decrease to $1,000 from $1,200 for clearing members, to $1,100 from $1,320 for members, and to $1,350 from $1,620 for customers. The margins for the second month will decrease to $700 from $800 for clearing members, to $770 from $880 for members, and to $945 from $1,080 for customers. The margins for the third to sixth months will decrease to $800 from $950 for clearing members, to $880 from $1,045 for members, and to $1,080 from $1,283 for customers. Margins for the seventh to 12th months will decrease to $600 from $700 for clearing members, to $660 from $770 for members, and to $810 from $945 for customers. 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 and second months of the Sumas swap futures contract will decrease to $900 from $1,000 for clearing members, to $990 from $1,100 for members, and to $1,215 from $1,350 for customers. The margins for the third to fifth months will decrease to $750 from $850 for clearing members, to $825 from $935 for members, and to $1,013 from $1,148 for customers. Margins for all other months will decrease to $550 from $650 for clearing members, to $605 from $715 for members, and to $743 from $878 for customers.

The margins for the first month of the Tennessee Zone 0 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 $300 from $400 for clearing members, to $330 from $440 for members, and to $405 from $540 for customers.

The margins for the first month of the SoCal swap futures contract will decrease to $1,200 from $1,400 for clearing members, to $1,320 from $1,540 for members, and to $1,620 from $1,890 for customers. Margins for the second month will decrease to $700 from $800 for clearing members, to $770 from $880 for members, and to $945 from $1,080 for customers. The margins for the third to sixth months will decrease to $700 from $850 for clearing members, to $770 from $935 for members, and to $945 from $1,148 for customers. Margins for the seventh to 12th months will decrease to $500 from $650 for clearing members, to $550 from $715 for clearing members, and to $675 from $878 for members. 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 month of the Waha swap futures contract will decrease to $1,000 from $1,200 for clearing members, to $1,110 from $1,320 for members, and to $1,350 from $1,620 for customers. The margins for the second month 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 third to sixth months will decrease to $600 from $850 for clearing members, to $660 from $935 for members, and to $810 from $1,148 for customers. The margins for the seventh to 12th 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 remain the same.

The margins for the first month of the Transco Zone 6 swap futures contract will increase to $700 from $300 for clearing members, to $770 from $330 for members, and to $945 from $405 for customers. Margins for the second month will increase to $500 from $300 for clearing members, to $550 from $330 for members, and to $675 from $405 for customers. The margins for the third to sixth months will increase to $500 from $400 for clearing members, to $550 from $440 for members, and to $675 from $540 for customers. Margins for all other months will remain unchanged.

The margins for the first and second months of the PGE&E Malin swap futures contract will decrease to $1,000 from $1,200 for clearing members, to $1,100 from $1,320 for members, and to $1,350 from $1,620 for customers. Margins for the third to fifth months will decrease to $750 from $850 for clearing members, to $825 from $935 for members, and to $1,013 from $1,148 for customers. The margins for all other months will decrease to $500 from $600 for clearing members, to $550 from $660 for members, and to $675 from $810 for customers.

Margins for the first and second months of the PGE&E Citygate swap futures contract will decrease to $900 from $1,000 for clearing members, to $990 from $1,100 for members, and to $1,215 from $1,350 for customers. The margins for the third to fifth months will decrease to $750 from $850 for clearing members, to $825 from $935 for members, and to $1,013 from $1,148 for customers. Margins for all other months 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 first and second months of the Northern natural gas demarcation swap futures contract will decrease to $800 from $900 for clearing members, to $880 from $990 for members, and to $1,080 from $1,215 for customers. Margins for the third to fifth months 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 decrease to $500 from $600 for clearing members, to $550 from $660 for members, and to $675 from $810 for customers.

Margins for the first and second months of the Northern natural gas Ventura, Iowa swap futures contract will decrease to $700 from $800 for clearing members, to $770 from $880 for members, and to $945 from $1,080 for customers. The margins for the third to fifth 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 to $500 from $600 for clearing members, to $550 from $660 for members, and to $675 from $810 for customers.

Margins for the first month of the Panhandle swap futures contract will decrease to $900 from $1,000 for clearing members, to $990 from $1,100 for members, and to $1,215 from $1,350 for customers. The margins for the second month will decrease to $500 from $550 for clearing members, to $550 from $605 for members, and to $675 from $743 for customers. Margins for the third to 12th months 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 all other months will remain the same.

Margins for the first and second months of the Permian swap futures contract will decrease to $700 from $800 for clearing members, to $770 from $880 for members, and to $945 from $1,080 for customers. The margins for the third to sixth months will decrease to $800 from $900 for clearing members, to $880 from $990 for members, and to $1,080 from $1,215 for customers. Margins for the seventh to 12th months will decrease to $400 from $550 for clearing members, to $440 from $605 for members, and to $540 from $743 for customers. The margins for all other months will remain the same.

Margins for the first month of the CenterPoint basis swap futures contract will remain the same. The 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 Tetco Eastern South/STX swap futures contract will decrease to $700 from $800 for clearing members, to $770 from $880 for members, and to $945 from $1,080 for customers. The margins for the second month will decrease to $500 from $550 for clearing members, to $550 from $605 for members, and to $675 from $743 for customers. The 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 the seventh to 12th months will decrease to $400 from $550 for members, to $440 from $605 for members, and to $540 from $743 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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