News Release

NYMEX to Change Margins for Natural Gas Swing and Index Swap Futures Contracts

Thu Aug 07 2008

New York, NY, August 7, 2008 -- The New York Mercantile Exchange, Inc. today announced margin changes for its natural gas swing and index swap futures contracts, beginning at the close of business tomorrow.

Margins for the SoCal natural gas swing swap futures contract will decrease to $3,000 from $3,500 for clearing members, to $3,300 from $3,850 for members, and to $4,050 from $4,725 for customers.

Margins for the San Juan natural gas swing swap futures contract will decrease to $3,000 from $4,000 for clearing members, to $3,300 from $4,400 for members, and to $4,050 from $5,400 for customers.

Margins for the El Paso/Permian swing swap futures contract will decrease to $3,000 from $4,500 for clearing members, to $3,300 from $4,950 for members, and to $4,050 from $6,075 for customers.

Margins for the Kern Opal natural gas swing swap futures contract will decrease to $3,000 from $6,000 for clearing members, to $3,300 from $6,600 for members, and to $4,050 from $8,100 for customers.

Margins for the Panhandle swing swap futures contract will decrease to $2,000 from $3,000 for clearing members, to $2,200 from $3,300 for members, and to $2,700 from $4,050 for customers.

Margins for the TETCO M-3 natural gas swing swap futures contract will decrease to $2,000 from $4,000 for clearing members, to $2,200 from $4,000 for members, and to $2,700 from $5,400 for customers.

Margins for the Waha swing swap futures contract will decrease to $2,000 from $2,500 for clearing members, to $2,200 from $2,750 for members, and to $2,700 from $3,375 for customers.

Margins for the Ventura natural gas swing swap futures contract will decrease to $2,000 from $3,500 for clearing members, to $2,200 from $3,850 for members, and to $2,700 from $4,725 for customers.

Margins for the Transco Zone 6 daily swing swap futures contract will decrease to $4,000 from $9,000 for clearing members, to $4,400 from $9,900 for members, and to $5,400 from $12,150 for customers.

Margins for the Transco Zone 6 index swap futures contract will decrease to $4,000 from $8,000 for clearing members, to $4,400 from $8,800 for members, and to $5,400 from $10,800 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:  Tara Stowe, 212-299-2455 or Anu Ahluwalia, 212-299-2439

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