News Release

Exchange to Change Margins for NYMEX ClearPort® Petroleum Products & Spread Futures Contracts

Wed Aug 31 2005

NEW YORK, N.Y., August 31, 2005 —The New York Mercantile Exchange, Inc., today announced margin increases for petroleum products and spread futures contracts on NYMEX ClearPort®, effective at the close of business today.

Margins on the No. 2 heating oil up-down spread swap futures contract will increase to $500 from $400 for clearing members, to $550 from $440 for members, and to $675 from $540 for customers.

The margins on the unleaded 87 gasoline up-down spread swap futures contract will increase to $725 from $400 for clearing members, to $798 from $440 for members, and to $979 from $540 for customers.

Margins on the Gulf Coast gasoline calendar swap futures contract will increase to $6,000 from $3,500 for clearing members, to $6,600 from $3,850 for members, and to $8,100 from $4,725 for customers.

The margins on the Gulf Coast heating oil calendar swap futures and the Gulf Coast jet fuel calendar swap futures contract will increase to $4,500 from $3,250 for clearing members, to $4,950 from $3,575 for members, and to $6,075 from $4,388 for customers.

Margins on the first month of New York Harbor heating oil crack spread calendar swap futures contract will increase to $3,500 from $2,100 for clearing members, to $3,850 from $2,310 for members, and to $4,725 from $2,835 for customers. The margins on the second to seventh month will increase to $3,413 from $2,013 for clearing members, to $3,754 from $2,214 for members, and to $4,608 from $2,718 for customers. Margins on the eight through 10th month will increase to $3,238 from $1,750 for clearing members, to $3,562 from $1,925 for members, and to $4,371 from $2,363 for customers. The margins on all other months will increase to $2,363 from $1,663 for clearing members, to $ 2,599 from $1,829 for members, and to $3,190 from $2,245 for customers.

Margins on the New York Harbor gasoline crack spread calendar swap futures contract will increase to $4,550 from $2,100 for clearing members, to $5,005 from $2,310 for members, and to $6,143 from $2,835 for customers.

The margins on the Gulf Coast No. 2 heating oil crack spread swap futures contract will increase to $3,150 from $2,100 for clearing members, to $3,465 from $2,310 for members, and to $4,253 from $2,835 for customers.

Margins on the Gulf Coast unleaded 87 gasoline crack spread swap futures contract will increase to $3,675 from $2,100 for clearing members, to $4,043 from $2,310 for members, and to $4,961 from $2,835 for customers.

Margins on the Gulf Coast #6 fuel oil crack swap futures contract will increase to $2,415 from $2,400 for clearing members, to $2,657 from $2,640 for members, and to $3,260 from $3,240 for customers.

The margins on the New York Harbor residual fuel crack swap futures contract will increase to $1,725 from $600 for clearing members, to $1,898 from $660 for members, and to $2,329 from $810 for customers.

Margins on the New York Harbor unleaded gasoline vs. New York Harbor No. 2 heating oil spread swap futures contract will increase to $3,500 from $1,750 for clearing members, to $3,850 from $1,925 for members, and to $4,725 from $2,363 for customers.

The margins on the Gulf Coast gasoline vs. Gulf Coast heating oil spread swap futures contract will increase to $2,625 from $1,750 for clearing members, to $2,888 from $1,925 for members, and to $3,544 from $2,363 for customers.

The margins on the Gulf Coast jet vs. New York harbor No. 2 heating oil spread swap futures contract will increase to $500 from $350 for clearing members, to $550 from $385 for members, and to $675 from $473 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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