News Release

Exchange Announces Margin Changes for Natural Gas Futures Contracts

Tue Nov 29 2005

NEW YORK, N.Y., November 29, 2005 — The New York Mercantile Exchange, Inc., announced today it will change the margins for its natural gas futures, Henry Hub swap futures, Henry Hub penultimate swap futures, NYMEX miNYTM natural gas futures at the close of business tomorrow.

The margins on the first month of the natural gas futures contract will remain unchanged. Margins on the second month will decrease to $11,500 from $12,000 for clearing members, to $12,650 from $13,200 for members, and to $15,525 from $16,200 for customers. Margins on the third month will decrease to $11,500 from $12,500 for clearing members, to $12,650 from $13,750 for members, and to $15,525 from $16,875 for customers. The margins on the fourth month will decrease to $7,000 from $11,500 for clearing members, to $7,700 from $12,650 for members, and to $9,450 from $15,525 for customers. Margins on the fifth to ninth months will increase to $6,000 from $5,750 for clearing members, to $6,600 from $6,325 for members, and to $8,100 from $7,763 for customers. Margins on the 10th to 15th months will increase to $6,750 from $3,250 for clearing members, to $7,425 from $3,575 for members, and to $9,113 from $4,388 for customers. The margins on the 16th month will increase to $4,500 from $3,000 for clearing members, to $4,950 from $3,300 for members, and to $6,075 from $4,050 for customers. The margins on the 17th to 48th month will increase to $3,000 from $2,000 for clearing members, to $3,300 from $2,200 for members, and to $4,050 from $2,700 for customers. All other months 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

The margin rates on the first month of the Henry Hub swap and Henry Hub penultimate swap futures contracts will remain unchanged. The margins on the second month will decrease to $2,875 from $3,000 for clearing members, to $3,163 from $3,300 for members, and to $3,881 from $4,050 for customers. Margins on the third month will decrease $2,875 from $3,125 for clearing members, to $3,163 from $3,438 for members, and to $3,881 from $4,219 for customers. The margins on the fourth month will decrease to $1,750 from $2,875 for clearing members, to $1,925 from $3,163 for members, and to $2,363 from $3,881 for customers. Margins on the fifth to ninth months will increase to $1,500 from $1,438 for clearing members, to $1,650 from $1,581 for members, and to $2,025 from $1,941 for customers. Margins on the 10th to 15th months will increase to $1,688 from $813 for clearing members, to $1,856 from $894 for members, and to $2,278 from $1,097 for customers. The margins on the 16th month will increase to $1,125 from $750 for clearing members, to $1,238 from $825 for members, and to $1,519 from $1,013 for customers. The margins on the 17th to 48th months will increase to $750 from $500 for clearing members, to $825 from $ 550 for members, and to $1,013 from $675 for customers. All other months will increase to $500 from $375 for clearing members, to $550 from $413 for members, and to $675 from $506 for customers.

Margins on the first month of the NYMEX miNYTM natural gas futures contract will remain unchanged. The margin rates on the second month will decrease to $5,750 from $6,000 for clearing members, to $6,325 from $6,000 for members, and to $7,763 from $8,100 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.

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