News Release

Exchange to Change Margins for Natural Gas, Related Futures Contracts

Tue Sep 12 2006

NEW YORK, N.Y., September 12, 2006 — The New York Mercantile Exchange, Inc. today announced margin changes for its natural gas, Henry Hub swap, natural gas penultimate and last day, NYMEX miNYTM natural gas, and Henry Hub swing swap and penultimate futures contracts at the close of business tomorrow.

Margins for the first month of the natural gas and natural gas penultimate and last day futures contracts will decrease to $8,000 from $10,000 for clearing members, to $8,800 from $11,000 for members, and to $10,800 from $13,500 for customers. Margins for the second month will decrease to $9,000 from $10,500 for clearing members, to $9,900 from $11,550 for members, and to $12,150 from $14,175 for customers. The margins for the third month will decrease to $10,000 from $11,000 for clearing members, to $11,000 from $12,100 for members, and to $13,500 from $14,850 for customers. Margins for the fourth to sixth months will decrease to $10,500 from $11,500 for clearing members, to $11,550 from $12,650 for members, and to $14,175 from $15,525 for customers. Margins for the seventh month will decrease to $6,000 from $6,500 for clearing members, to $6,600 from $7,150 for members, and to $8,100 from $8,775 for customers. Margins for the eighth to 18th months 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 19th to 42nd months will decrease to $3,000 from $3,500 for clearing members, to $3,300 from $3,850 for members, and to $4,050 from $4,725 for customers. Margins for the 43rd to 57th months will decrease to $2,500 from $3,000 for clearing members, to $2,750 from $3,300 for members, and to $3,375 from $4,050 for customers. All other months will 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 $2,000 from $2,500 for clearing members, to $2,200 from $2,750 for members, and to $2,700 from $3,375 for customers. Margins for the second month will decrease to $2,250 from $2,625 for clearing members, to $2,475 from $2,888 for members, and to $3,038 from $3,544 for customers. Margins for the third month will decrease to $2,500 from $2,750 for clearing members, to $2,750 from $3,025 for members, and to $3,375 from $3,713 for customers. Margins for the fourth to sixth months will decrease to $2,625 from $2,875 for clearing members, to $2,888 from $3,163 for members, and to $3,544 from $3,881 for customers. Margins for the seventh month will decrease to $1,500 from $1,625 for clearing members, to $1,650 from $1,788 for members, and to $2,025 from $2,194 for customers. Margins for the eighth to 18th months will decrease to $1,375 from $1,500 for clearing members, to $1,513 from $1,650 for members, and to $1,856 from $2,025 for customers. Margins for the 19th to 42nd months will decrease to $750 from $875 for clearing members, to $825 from $963 for members, and to $1,013 for $1,181 for customers. Margins for the 43rd to 57th months will decrease to $625 from $750 for clearing members, to $688 from $825 members, and to $844 from $1,013 for customers. All other months will remain unchanged.

Margins for the first month of the Henry Hub swing swap futures contract will decrease to $2,000 from $2,500 for clearing members, to $2,200 from $2,750 for members, and to $2,700 from $3,375 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

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