News Release

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

Tue May 01 2007

NEW YORK, N.Y., May 1, 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 decrease to $1,200 from $1,500 for clearing members, to $1,320 from $1,650 for members, and to $1,620 from $2,025 for customers. The margins for the second month will decrease to $1,000 from $1,200 for clearing members, to $1,100 from $1,320 for members, and to $1,350 from $1,620 for customers. Margins for the third to sixth months will increase to $1,000 from $750 for clearing members, to $1,100 from $825 for members, and to $1,350 from $1,013 for customers. Margins for the seventh to 12th months will decrease to $500 from $650 for clearing members, to $550 from $715 for members, and to $675 from $878 for customers. The margins for all other months will remain unchanged.

Margins for the first month of the Alberta basis swap futures contract will decrease to $1,000 from $1,200 for clearing members, to $1,100 from $1,320 for members, and to $1,350 from $1,620 for customers. The margins for the second month will decrease to $800 from $1,000 for clearing members, to $880 from $1,100 for members, and to $1,080 from $1,350 for customers. Margins for the third to sixth months will decrease to $300 from $500 for clearing members, to $330 from $550 for members, and to $405 from $675 for customers. Margins for the seventh to 12th months will decrease to $250 from $300 for clearing members, to $275 from $330 for members, and to $338 from $405 for customers. The margins for all other months will decrease to $100 from $200 for clearing members, to $110 from $220 for members, and to $135 from $270 for customers.

The margins for the first month of the Chicago basis swap futures contracts will decrease to $500 from $600 for clearing members, to $550 from $660 for members, and to $675 from $810 for customers. Margins for all other months will decrease to $400 from $500 for clearing members, to $440 from $550 for members, and to $540 from $675 for customers.

Margins for the first and second months of the SUMAS basis swap futures contract will decrease to $500 from $700 for clearing members, to $550 from $770 for members, and to $675 from $945 for customers. The margins for the third through fifth months will decrease to $400 from $600 for clearing members, to $440 from $660 for members, and to $540 from $810 for customers. The margins for all other months will decrease to $300 from $500 for clearing members, to $330 from $550 for members, and to $405 from $675 for customers.

The margins for the first and second months of the Northwest Pipeline, Rockies basis swap futures contract will remain unchanged. The margins for the third to sixth months will increase to $1,000 from $500 for clearing members, to $1,100 from $550 for members, and to $1,350 from $675 for customers. The margins for all other months will remain the same.

Margins for the first month of the Waha basis swap futures contract will decrease to $500 from $750 for clearing members, to $550 from $825 for members, and to $675 from $1,013 for customers. The margins for the second month will remain unchanged. Margins for the third to 12th months will decrease to $300 from $400 for clearing members, to $330 from $440 for members, and to $405 from $540 for customers. The margins for all other months will remain the same.

The margins for the first and second months of the PGE&E Malin basis swap and the PGE&E Citygate basis swap futures contracts will decrease to $500 from $700 for clearing members, to $550 from $770 for members, and to $675 from $945 for customers. The margins for the third through fifth months will to decrease to $400 from $500 for clearing members, to $440 from $550 for members, and to $540 from $675 for customers. The margins for all other months will remain unchanged.

Margins for the first month of the NGPL Tex/ OK 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 $350 for clearing members, to $330 from $385 for members, and to $405 from $473 for customers. Margins for the third to sixth months will decrease to $300 from $450 for clearing members, to $330 from $495 for members, and to $405 from $608 for customers. Margins for the seventh to 12th months will decrease to $300 from $500 for clearing members, to $330 from $550 for members, and to $405 from $675 for customers. The margins for all other months will remain the same.

Margins for the first and second months of the Northern Natural Gas Demarcation basis swap futures contract will decrease to $500 from $700 for clearing members, to $550 from $770 for members, and to $675 from $945 for customers. The margins for the third through fifth months will remain unchanged. The margins for all other months will decrease to $300 from $400 for clearing members, to $330 from $440 for members, and to $405 from $540 for customers.

The margins for the first and second months of the Northern Natural Gas Ventura, Iowa basis swap futures contract will decrease to $500 from $600 for clearing members, to $550 from $660 for members, and to $675 from $810 for customers. The margins for all other months will remain unchanged.

Margins for the first month of the Panhandle basis swap futures contract will decrease to $600 from $800 for clearing members, to $660 from $880 for members, and to $810 from $1,080 for customers. The margins for the second to sixth months will remain the same. Margins for the seventh to 12th months will decrease to $300 from $500 for clearing members, to $330 from $550 for members, and to $405 from $675 for customers. The margins for all other months will decrease to $300 from $350 for clearing members, to $330 from $385 for members, and to $405 from $473 for customers.

Margins for the first month of the Permian basis swap futures contract will remain unchanged. The margins for the second month will decrease to $400 from $500 for clearing members, to $440 from $550 for members, and to $540 from $675 for customers. Margins for the third to sixth months will decrease to $300 from $500 for clearing members, to $330 from $550 for members, and to $405 from $675 for customers. The margins for the seventh to 12th months will decrease to $300 from $400 for clearing members, to $330 from $440 for members, and to $405 from $540 for customers. The margins for all other months will remain the same.

Margins for the first month of the Tetco Eastern South/STX basis swap futures contract will decrease to $500 from $600 for clearing members, to $550 from $660 for members, and to $675 from $810 for customers. The margins for the second month will remain unchanged. Margins for the third to 12th months will decrease to $300 from $400 for clearing members, to $330 from $440 for members, and to $405 from $540 for customers. The margins for all other months will remain the same.

The margins for the first and second months of the Demarcation, Dominion, CenterPoint, El Paso/Permian, Henry Hub, Dawn, Panhandle, NGPL Mid-Continent, NGPL Tex/Ok, and the Ventura index swap futures contracts will decrease to $1,200 from $1,500 for clearing members, to $1,320 from $1,650 for members, and to $1,620 from $2,025 for customers. Margins for all other months will remain the same.

The margins for the first and second months of the SoCal index swap futures contract will decrease to $1,200 from $1,800 for clearing members, to $1,320 from $1,980 for members, and to $1,620 from $2,430 for customers. The margins for all other months will remain the same.

The margins for the first and second months of the San Juan and PG&E Citygate index swap futures contracts will decrease to $1,200 from $2,000 for clearing members, to $1,320 from $2,200 for members, and to $1,620 from $2,700 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. The margins for all other months will remain the same.

The margins for the first and second months of the TETCO M-3 and Waha index swap futures contracts will decrease to $1,500 from $2,000 for clearing members, to $1,650 from $2,200 for members, and to $2,025 from $2,700 for customers. The margins for all other months will remain the same.

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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: Brenda Guzman, 212-99-2436 or  Keil Decker, 212-299-2209

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