News Release

NYMEX to Change Margins for Natural Gas, Relates Futures Contracts

Tue Aug 01 2006

NEW YORK, NY, August 1, 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 tomorrow.

Margins for the first month of the natural gas, natural gas penultimate and natural gas last day futures contract will increase to $10,000 from $8,500 for clearing members, to $11,000 from $9,350 for members, and to $13,500 from $11,475 for customers. The margins for the second and third months will increase to $10,500 from $9,000 for clearing members, to $11,500 from $9,900 for members, and to $14,175 from $12,150 for customers. Margins for the fourth to seventh months will increase to $11,000 from $10,000 for clearing members, to $12,100 from $11,000 for members, and to $14,850 from $13,500 for customers. The margins for the eighth to ninth 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 the10th to 20th 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 all other months will remain unchanged.

Margins for the first month of the Henry Hub swap and Henry Hub penultimate swap futures contracts will increase to $2,500 from $2,125 for clearing members, to $2,750 from $2,338 for members, and to $3,375 from $2,869 for customers.

The margins for the second and third months will increase to $2,625 from $2,250 for clearing members, to $2,888 from $2,475 for members, and to $3,544 from $3,038 for customers. Margins for the fourth to seventh 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 the eighth to ninth 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 10th to 20th 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 all other months will remain unchanged.

The margins for the first month of the NYMEX miNYTM natural gas futures contracts will increase to $2,500 from $2,125 for clearing members, to $2,750 from $2,338 for members, and to $3,375 from $2,869 for customers. The margins for the second and third months will increase to $2,625 from $2,250 for clearing members, to $2,888 from $2,475 for members, and to $3,544 from $3,038 for customers.

Margins for the first month of the Henry Hub swing swap futures contract will increase to $2,500 from $2,125 for clearing members, to $2,750 from $2,338 for members, and to $3,375 from $2,869 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: Brenda Guzman, 212-299-2436

Corporate Communications

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