News Release

NYMEX to Change Margins for Natural Gas Basis, Index Swap Futures Contracts

Thu Jul 05 2007

NEW YORK, N.Y., July 5, 2007 -- The New York Mercantile Exchange, Inc. today announced margin changes for several of its natural gas basis and index swap futures contracts at the close of business tomorrow.

Margins for the first month of the CIG Rockies basis swap futures contract will increase to $2,000 from $1,200 for clearing members, to $2,200 from $1,320 for members, and to $2,700 from $1,620 for customers. The margins for the second to sixth months will increase to $2,500 from $1,200 for clearing members, to $2,750 from $1,320 for members, and to $3,375 from $1,620 for customers. Margins for all other months will remain unchanged.

The margins for the Florida Gas Zone 3 basis swap futures contract will increase to $300 from $200 for clearing members, to $330 from $220 for members, and to $405 from $270 for customers.

Margins for the first month of the Northwest Pipeline, Rockies basis swap futures contract will increase to $1,500 from $1,200 for clearing members, to $1,650 from $1,320 for members, and to $2,025 from $1,620 for customers. Margins for the second to sixth months will increase to $1,500 from $1,250 for clearing members, to $1,650 from $1,375 for members, and to $2,025 from $1,688 for customers. The margins for the seventh to ninth months will remain the same. The margins for the 10th to 16th months will decrease to $300 from $400 for clearing members, to $330 from $440 for members, and to $405 from $540 for customers.  Margins for all other months will decrease to $200 from $400 for clearing members, to $220 from $440 for members, and to $270 from $540 for customers.

Margins for the first month of the Tetco Eastern South/STX basis swap futures contract will decrease to $400 from $500 for clearing members, to $440 from $550 for members, and to $540 from $675 for customers. The margins for the second month will decrease to $300 from $400 for clearing members, to $330 from $440 for members, and to $405 from $540 for customers. Margins for the third to sixth months will decrease to $200 from $300 for clearing members, to $220 from $330 for members, and to $270 from $405 for customers.  The margins for all other months will remain the same.

The margins for the first and second months of the Transco Zone 6 index 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 third month will increase to $1,000 from $250 for clearing members, to $1,100 from $275 for members, and to $1,350 from $338 for customers.  Margins for all other months will remain unchanged. 

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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: Anu Ahluwalia, 212-299-2439 or  Keil Decker, 212-299-2209

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