News Release

Exchange Announces Margin Changes for Natural Gas, Gasoline and Heating Oil Futures Contracts

Wed Nov 09 2005

NEW YORK, N.Y., November 9 — 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, unleaded gasoline futures, New York Harbor gasoline calendar swap futures, New York Harbor gasoline blendstock futures, heating oil futures and New York Harbor heating oil calendar swap futures contracts at the close of business on tomorrow.

Margins rates on the fourth month of the natural gas futures contract will decrease to $11,500 from $13,000 for clearing members, to $12,650 from $14,300 for members, and to $15,525 from $17,550 for customers. The margins on all other months will remain unchanged.

The margin rates on the fourth month of the Henry hub swap and Henry Hub penultimate swap futures contracts will decrease to $2,875 from $3,250 for clearing members, to $3,163 from $3,575 for members, and to $3,881 from $4,388 for customers. The margins rates on all other months will remain unchanged.

Margin rates on the December unleaded gasoline futures and New York Harbor gasoline calendar swap futures contracts will decrease to $4,500 from $7,000 for clearing members, to $4,950 from $7,700 for members, and to $6,075 from $9,450 for customers. Margins all other months will decrease to $4,500 from $6,000 for clearing members, to $4,950 from $6,600 for members, and to $6,075 from $8,100 for customers.

Margins rates on the New York Harbor gasoline blendstock futures contract will decrease to $4,500 from $6,000 for clearing members, to $4,950 from $6,600 for members, and to $6,075 from $8,100 for customers.

Margins rates on the first month of the heating oil futures and New York Harbor heating oil calendar swap futures contract will decrease to $5,000 from $6,500 for clearing members, to $5,500 from $7,150 for members, and to $6,750 from $8,775 for customers. Margins on the second to seventh months will decrease to $4,500 from $6,000 for clearing members, to $4,950 from $6,600 for members, and to $6,075 from $8,100 for customers. The margins on the eighth to 10th months will increase to $4,000 from $5,500 for clearing members, to $4,400 from $6,050 for members, and to $5,400 from $7,425 for customers. Margins on all other months will decrease to $3,500 from $5,000 for clearing members, to $3,850 from $5,500 for members, and to $4,725 from $6,750 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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