News Release

Exchange to Increase Margins for Natural Gas Basis Swap Futures Contracts

Thu Dec 29 2005

NEW YORK, N.Y., December 29, 2005 — The New York Mercantile Exchange, Inc., today announced that it will increase the margins on its natural gas basis swap futures contracts, effective at the close of business tomorrow.

Margins for the first month of the Alberta gas basis 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 unchanged.

Margins for the first month of the San Juan basis swap futures contract will increase to $2,000 from $1,100 for clearing members, to $2,200 from $1,210 for members, and to $2,700 from $1,485 for customers. Margins for all other months will increase to $700 from $475 for clearing members, to $770 from $523 for members, and to $945 from $641 for customers.

Margins for the first month of the SoCal basis swap futures contract will increase to $2,000 from $1,100 for clearing members, to $2,200 from $1,210 for members, and to $2,700 from $1,485 for customers. Margins for all other months will increase to $650 from $550 for clearing members, to $715 from $605 for members, and to $878 from $743 for customers.

Margins for the first month of the Northwest Pipeline, Rockies basis swap futures contract will increase to $1,500 from $1,100 for clearing members, to $1,650 from $1,210 for members, and to $2,025 from $1,485 for customers. The margins for all other months will remain the same.

The margins for the first month of the PGE&E Malin basis swap futures contract will increase to $1,500 from $1,200 for clearing members, to $1,650 from $1,320 for members, and to $2,025 from $1,620 for customers. Margins for all other months will increase to $700 from $500 for clearing members, to $770 from $550 for members, and to $945 from $675 for customers.

Margins for the first month of the PGE&E Citygate basis swap futures contract will increase to $2,000 from $1,300 for clearing members, to $2,200 from $1,430 for members, and to $2,700 from $1,755 for customers. The margins for all other months will remain the same.

Margins for the first month of the Sumas basis swap futures contract will increase to $2,000 from $1,200 for clearing members, to $2,200 from $1,320 for members, and to $2,700 from $1,620 for customers. The margins for all other months will remain the same.

The margins for the first month of the CIG Rockies basis swap futures contract will increase to $2,000 from $1,200 for clearing members, to $2,200 from $1,320 for members, and to $2,700 from $1,620 for customers. Margins on the second month will increase to $800 from $600 for clearing members, to $880 from $660 for members, and to $1,080 from $810 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.

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