News Release

NYMEX to Change Margins for Natural Gas, Related Futures Contracts

Mon Nov 13 2006

NEW YORK, N.Y., November 13, 2006 — The New York Mercantile Exchange, Inc. today announced margin changes for its natural gas, Henry Hub swap and penultimate swap, natural gas penultimate and last day, and NYMEX miNYTM natural gas futures contracts at the close of business tomorrow.

Margins for the first month through the 28th month of the natural gas and natural gas penultimate and last day futures contracts will remain unchanged. The margins for the 29th to 40th months will decrease to $3,750 from $4,250 for clearing members, to $4,125 from $4,675 for members, and to $5,063 from $5,738 for customers. Margins for the 41st to 52nd months will decrease to $4,000 from $4,500 for clearing members, to $4,400 from $4,950 for members, and to $5,400 from $6,075 for customers. The margins for all other months will decrease to $4,000 from $4,750 for clearing members, to $4,400 from $5,225 for members, and to $5,400 from $6,413 for customers.

Margins for the first month through the 28th month of the NYMEX miNY natural gas and Henry Hub swap and penultimate swap futures contracts will remain the same. Margins for the 29th to 40th months will decrease to $938 from $1,063 for clearing members, to $1,031 from $1,169 for members, and to $1,266 from $1,434 for customers. Margins for the 41st to 52nd months will decrease to $1,000 from $1,125 for clearing members, to $1,100 from $1,238 members, and to $1,350 from $1,519 for customers. Margins for all other months will decrease to $1,000 from $1,188 for clearing members, to $1,100 from $1,306 members, and to $1,350 from $1,603 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

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