News Release

NYMEX to Change Margins for Natural Gas, Related Futures Contracts

Mon Feb 26 2007

NEW YORK, N.Y., February 26, 2007 — 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, NYMEX miNYTM natural gas and Henry Hub swing swap futures contracts, effective at the close of business on February 27.

Margins for the first month of the natural gas, natural gas penultimate and natural gas last day futures contracts will decrease to $6,500 from $7,500 for clearing members, to $7,150 from $8,250 for members, and to $8,775 from $10,125 for customers. Margins for the second month will decrease to $6,000 from $7,000 for clearing members, to $6,600 from $7,700 for members, and to $8,100 from $9,450 for customers. The margins for the third month will decrease to $5,500 from $6,000 for clearing members, to $6,050 from $6,600 for members, and to $7,425 from $8,100 for customers. Margins for the fourth to sixth months will increase to $5,500 from $5,000 for clearing members, to $6,050 from $5,500 for members, and to $7,425 from $6,750 for customers. Margins for the seventh to 12th 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. The margins for the 13th to 36th months will remain the same. Margins for the 37th to 48th months will increase to $2,750 from $2,500 for clearing members, to $3,025 from $2,750 for members, and to $3,713 from $3,375 for customers. The margins for all other months will increase to $2,250 from $2,000 for clearing members, to $2,475 from $2,200 for members, and to $3,038 from $2,700 for customers.

The margins for the first month of the NYMEX miNY natural gas and Henry Hub swap and penultimate swap futures contracts will decrease to $1,625 from $1,875 for clearing members, to $1,788 from $2,063 for members, and to $2,194 from $2,531 for customers. Margins for the second month will decrease to $1,500 from $1,750 for clearing members, to $1,650 from $1,925 for members, and to $2,025 from $2,363 for customers. The margins for the third month will decrease to $1,375 from $1,500 for clearing members, to $1,513 from $1,650 for members, and to $1,865 from $2,025 for customers. Margins for the fourth to sixth months will increase to $1,375 from $1,250 for clearing members, to $1,513 from $1,375 for members, and to $1,856 from $1,688 for customers. The margins for the seventh to 12th 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 13th to 36th months will remain unchanged. The margins for the 37th to 48th months will increase to $688 from $625 for clearing members, to $756 from $688 for members, and to $928 from $844 for customers. Margins for all other months will increase to $563 from $500 for clearing members, to $619 from $550 for members, and to $759 from $675 for customers.

Margins for the first month of Henry Hub swing swap futures will decrease from $1,625 from $1,875 for clearing members, to $1,788 from $2,063 for members, and to $2,194 from $2,531 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: Steffanie Marchese, 212-299-2455 or  Keil Decker, 212-299-2209

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