News Release

NYMEX to Change Margins for Natural Gas, Related Futures Contracts

Tue Mar 27 2007

NEW YORK, NY, March 27, 2007 — The New York Mercantile Exchange, Inc. today announced margin changes for its natural gas; Henry Hub swap, swing swap, and penultimate swap; natural gas penultimate and last day financial; and NYMEX miNYTM natural gas futures contracts, effective at the close of business tomorrow.

Margins for the first month of the natural gas, natural gas penultimate financial and natural gas last-day financial futures contracts will decrease to $5,000 from $5,500 for clearing members, to $5,500 from $6,050 for members, and to $6,750 from $7,425 for customers. Margins for the second and third months will remain the same. Margins for the fourth to sixth months will increase to $6,000 from $5,500 for clearing members, to $6,600 from $6,050 for members, and to $8,100 from $7,425 for customers. Margins for the seventh to 11th months will increase to $6,500 from $6,000 for clearing members, to $7,150 from $6,600 for members, and to $8,775 from $8,100 for customers. Margins for the 12th to 23rd months will increase $4,500 from $4,000 for clearing members, to $4,950 from $4,400 for members, and to $6,075 from $5,400 for customers. Margins for all other months remain unchanged.

Margins for the first month of the NYMEX miNY natural gas and Henry Hub swap and penultimate swap futures contracts will decrease to $1,250 from $1,375 for clearing members, to $1,375 from $1,513 for members, and to $1,688 from $1,856 for customers. Margins for the second and third months will remain the same. The margins for the fourth to sixth months will increase to $1,500 from $1,375 for clearing members, to $1,650 from $1,513 for members, and to $2,025 from $1,856 for customers. Margins for the seventh to 11th months will increase to $1,625 from $1,500 for clearing members, to $1,788 from $1,650 for members, and to $2,194 from $2,025 for customers. Margins for the 12th to 23rd months will increase to $1,125 from $1,000 for clearing members, to $1,238 from $1,100 for members, and to $1,519 from $1,350 for customers. Margins for all other months will remain unchanged.

Margins for the Henry Hub swing swap futures contract will decrease to $1,250 from $1,375 for clearing members, to $1,375 from $1,513 for members, and to $1,688 from $1,856 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: Anu Ahluwalia , 212-299-2439 or  Keil Decker, 212-299-2209

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