News Release

Exchange to Increase Margins for Natural Gas and Related Futures Contracts

Wed Sep 21 2005

NEW YORK, N.Y., September 21, 2005 — The New York Mercantile Exchange, Inc., today announced margin increases for its natural gas futures, Henery Hub swap futures, NYMEX miNYsm natural gas futures, Henry Hub swing swap futures, and Henry Hub penultimate swap futures contracts, effective at the close of business on September 22.

Margins on the first month of the natural gas futures contract will increase to $13,000 from $10,000 for clearing members; to $14,300 from $11,000 for members; and to $17,550 from $13,500 for customers. The margins on the second month will increase to to $12,500 from $10,000 for clearing members; to $13,750 from $11,000 for members; and to $16,875 from $13,500 for customers. Margins on the third month will increase to $12,500 from $11,000 for clearing members; to $13,750 from $12,100 for members; and to $16,875 from $14,850 for customers. The margins on the fourth to sixth months will increase to $12,000 from $11,500 for clearing members; to $13,200 from $12,650 for members; and to $16,200 from $15,525 to customers. Margins on all other months are unchanged.

The margins on the first months of the Henry Hub swap and Henry Hub penultimate swap futures contracts will increase to $3,250 from $2,500 for clearing members; to $3,575 from $2,750 for members; and to $4,388 from $3,375 for customers. The margins on the second month will increase to $3,125 from $2,500 for clearing members; to $3,438 from $2,750 for members; and to $4,219 from $3,375 for customers. Margins on the third month will increase to $3,125 from $2,750 for clearing members; to $3,438 from $3,025 for members; and to $4,219 from $3,713 to customers. The margins on the fourth to sixth months will increase to $3,000 from $2,875 for clearing members; to $3,300 from $3,163 for members; and to $4,050 from $3,881 to customers. All other months will remain the same.

Margins on the first month of the NYMEX miNYsm natural gas futures contract will increase to $6,500 from $5,000 for clearing members; to $7,150 from $5,500 for members; and to $8,775 from $6,750 for customers. Second month margins will increase to $6,250 from $5,000 for clearing members; to $6,875 from $5,500 for members; and to $8,438 from $6,750 for customers.

Margins on first month of the Henry Hub swing swap futures contracts will increase to $3,250 from $2,500 for clearing members; to 3,575 from $2,750 for members; and to 4,388 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.

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