News Release

Exchange to Increase Margins for Natural Gas Swing Swap Futures Contracts

Tue Oct 04 2005

NEW YORK, N.Y., October 4, 2005 — The New York Mercantile Exchange, Inc., today announced that it will increase the margins on its natural gas swing swap futures contracts, effective at the close of business on October 5.

Margins for the Dominion swing swap futures contract will increase to $3,500 from $2,125 for clearing members; to $3,850 from $2,338 for members; and to $4,725 from $2,869 for customers.

Margins for the Kern River and PG&E Citygate swing swap futures contracts will increase to $3,750 from $2,625 for clearing members; to $4,125 from $2,888 for members; and to $5,063 from $3,544 for customers.

Margins for the San Juan swing swap futures contract will increase to $3,500 from $3,375 for clearing members; to $3,850 from $3,713 for members; and to $4,725 from $4,556 for customers.

Margins for the SoCal swing swap futures contract will increase to $4,000 from $3,625 for clearing members; to $4,400 from $3,988 for members; and to $5,400 from $4,894 for customers.

Margins for the Sumas swing swap futures contract will increase to $3,000 from $2,375 for clearing members; to $3,300 from $2,613 for members; and to $4,050 from $3,206 for customers.

Margins for the Tetco M-3 and Transco Zone 6 swing swap futures contracts will increase to $4,000 from $2,250 for clearing members; to $4,400 from $2,475 for members; and to $5,400 from $3,038 for customers.

Margins for the Chicago Citygate and El Paso Permian swing swap futures contracts will increase to $3,600 from $2,969 for clearing members; to $3,960 from $3,266 for members; and to $4,860 from $4,008 for customers.

Margins for the Houston Ship Channel and Waha swing swap futures contracts will increase to $5,000 from $2,969 for clearing members; to $5,500 from $3,266 for members; and to $6,750 from $4,008 for customers.

Margins for the Panhandle swing swap futures contract will increase to $3,500 from $2,969 for clearing members; to $3,850 from $3,266 for members; and to $4,725 from $4,008 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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