News Release

NYMEX to Change Margins for Natural Gas, Related Futures Contracts

Tue Jun 27 2006

NEW YORK, NY, June 27, 2006 — The New York Mercantile Exchange, Inc. today announced margin changes for its natural gas, Henry Hub swaps, NYMEX miNYTM natural gas, Henry Hub swing swap, Henry Hub penultimate swap, and the natural gas penultimate and last day futures contracts at the close of business on Thursday.

Margins for the first and second months of the natural gas futures contract will remain unchanged. The margins for the third and fourth months will increase to $8,000 from $7,500 for clearing members, to $8,800 from $8,250 for members, and to $10,800 from $10,125 for customers. Margins for the fifth to eighth months will increase to $9,500 from $9,000 for clearing members, to $10,450 from $9,900 for members, and to $12,825 from $12,150 for customers. Margins for the ninth and 10th months remain unchanged. Margins for the 11th to 21st months will increase to $4,000 from $3,500 for clearing members, to $4,400 from $3,850 for members, and to $5,400 from $4,725 for customers. Margins for the 22nd to 44th months will increase to $3,500 from $3,000 for clearing members, to $3,850 from $3,300 for members, and to $4,725 from $4,050 for customers. Margins for the 45th to 57th months will increase to $3,000 from $2,500 for clearing members, to $3,300 from $2,750 for members, and to $4,050 from $3,375 for customers. Margins for all other months will increase to $2,500 from $2,000 for clearing members, to $2,750 from $2,200 for members, and to $3,375 from $2,700 for customers.

Margins for the first and second months of the Henry Hub swing swap and Henry Hub penultimate swap futures contracts will remain unchanged. Margins for the third and fourth months will increase to $2,000 from $1,875 for clearing members, to $2,200 from $2,063 for members, and to $2,700 from $2,531 for customers. The margins for the fifth through eighth months will increase to $2,375 from $2,250 for clearing members, to $2,613 from $2,475 for members, and to $3,206 from $3,038 for customers. Margins for the ninth and 10th months will remain unchanged. Margins for the 11th to 21st months will increase to $1,000 from $875 for clearing members, to $1,100 from $963 for members, and to $1,350 from $1,181 for customers. Margins for the 22nd to 44th months will increase to $875 from $750 for clearing members, to $963 from $825 for members, and to $1,181 from $1,013 for customers. Margins for the 45th to 57th months will increase to $750 from $625 for clearing members, to $825 from $688 for members, and to $1,013 from $844 for customers. Margins for all other months will increase to $625 from $500 for clearing members, to $688 to $550 for members, and to $844 from $675 for customers.

The margins for the first and second months of the NYMEX miNYTM natural gas futures contracts will remain unchanged. Margins for the third month will increase to $2,000 from $1,875 for clearing members, to $2,200 from $2,063 for members, and to $2,700 from $2,531 for customers.

Margins for the first month of the Henry Hub swing swap futures contract will remain unchanged.

Margins for the first two months of the natural gas penultimate and natural gas last day futures contracts will remain unchanged. Margins for the third and fourth months will increase to $8,000 from $7,500 for clearing members, to $8,800 from $8,250 for members, and to $10,800 from $10,125 for customers. Margins for the fifth to eighth months will increase to $9,500 from $9,000 for clearing members, to $10,450 from $9,900 for members, and to $12,825 from $12,150 for customers. Margins for the ninth and 10th months remain unchanged. The margins for the 11th to 21st months increase to $4,000 from $3,500 for clearing members, to $4,400 from $3,850 for members, and to $5,400 from $4,725 for customers. Margins for the 22nd to 44th months will increase to $3,500 from $3,000 for clearing members, to $3,850 from $3,300 for members, and to $4,725 from $4,050 for customers. Margins for the 45th to 57th months will increase to $3,000 from $2,500 for clearing members, to $3,300 from $2,750 for members, and to $4,050 from $3,375 for customers. Margins for all other months will increase $2,500 from $2,000 for clearing members, to $2,750 from $2,200 for members, and to $3,375 from $2,700 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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