News Release

NYMEX to Change Margins for Natural Gas Basis Swaps Futures Contracts

Fri Jun 09 2006

NEW YORK, N.Y., June 9, 2006 — The New York Mercantile Exchange, Inc. today announced margin and intra–commodity spread margin changes for several of its natural gas basis swap futures contracts at the close of business on June 12.

Margins for the first month of the CIG Rockies basis swap futures contract will remain the same. The margins on the second month will increase to $750 from $600 for clearing members, to $825 from $660 for members, and to $1,013 from $810 for customers. Margins on the third to sixth month will increase to $900 from $450 for clearing members, to $990 from $495 for members, and to $1,215 from $608 for customers. The margins on the seventh to 12th months will increase to $650 from $200 for clearing members, to $715 from $220 for members, and to $878 from $270 for customers. Margins on all other months will increase to $500 from $450 for clearing members, to $550 from $495 for members, and to $675 from $608 for customers.

Margins for the first month of the Transco Zone 3 basis swap futures contract will remain the same. The margins on the second to 12th months will decrease to $100 from $200 for clearing members, to $110 from $220 for members, and to $135 from $270 for customers. Margins on all other months will remain unchanged.

Margins for all months of the Florida gas transmission Zone 3 futures contract will increase to $200 from $75 for clearing members, to $220 from $83 for members, and to $270 from $101 for customers.

The margins for the first month of the Columbia Gulf onshore basis swap futures contract will remain the same. The margins on the second month will increase to $80 from $75 for clearing members, to $88 from $83 for members, and to $108 from $101 for customers. Margins on the third to sixth month will increase to $85 from $75 for clearing members, to $94 from $83 for members, and to $115 from $101 for customers. Margins on all other months will increase to $150 from $75 for clearing members, to $165 from $83 for members, and to $203 from $101 for customers.

Margins for the first month of the Alberta basis swap futures contract will remain the same. The margins on the second month will increase to $700 from $600 for clearing members, to $770 from $660 for members, and to $945 from $810 for customers. Margins on the third to sixth month will increase to $950 from $450 for clearing members, to $1,045 from $495 for members, and to $1,283 from $608 for customers. The margins on the seventh to 12th months will increase to $650 from $200 for clearing members, to $715 from $220 for members, and to $878 from $270 for customers. Margins on all other months will increase to $350 from $100 for clearing members, to $385 from $110 for members, and to $473 from $135 for customers.

The margins for the first month of the Chicago basis swap futures contract will remain the same. Margins on all other months will increase to $600 from $450 for clearing members, to $660 from $495 for members, and to $810 from $608 for customers.

Margins for the first month of the ANR, LA basis swap futures contract will remain the same. The margins on all other months will increase to $75 from $50 for clearing members, to $83 from $55 for members, and to $101 from $68 for customers.

The margins for the first month of the ANR Oklahoma basis swap futures contract will remain the same. Margins on all other months will increase to $600 from $500 for clearing members, to $660 from $550 for members, and to $810 from $675 for customers.

The margins for the first month of the MichCon basis swap futures contract will decrease to $500 from $625 for clearing members, to $550 from $688 for members, and to $675 from $844 for customers. The margins for the second month will increase to $500 from $200 for clearing members, to $550 from $220 for members, and to $675 from $270 for customers. Margins on the third to fifth month will increase to $600 from $200 for clearing members, to $660 from $220 for members, and to $810 from $270 for customers. Margins on all other months will be increase to $550 from $200 for clearing members, to $605 from $220 for members, and to $743 from $270 for customers.

The margins for the first and second month of the Houston Ship Channel basis swap futures contract will remain the same. Margins on the third to sixth month will decrease to $500 from $600 for clearing members, to $550 from $660 for members, and to $675 from $810 for customers. The margins on the seventh to 12th months will remain the same at $600 for clearing members, $660 for members, and $810 for customers. Margins on all other months will increase to $300 from $600 for clearing members, $330 from $660 for members, and $405 from $810 for customers.

Margins for the first month of the San Juan basis swap futures contract will remain the same. The margins on the second month will increase to $750 from $600 for clearing members, to $825 from $660 for members, and to $1,013 from $810 for customers. Margins on the third to sixth month will increase to $950 from $500 for clearing members, to $1,045 from $550 for members, and to $1,283 from $675 for customers. The margins on the seventh to 12th months will increase to $700 from $300 for clearing members, to $770 from $330 for members, and to $945 from $405 for customers. Margins on all other months will increase to $500 from $250 for clearing members, to $550 from $275 for members, and to $675 from $338 for customers.

Margins for the first month of the SUMAS basis swap futures contract will remain the same. Margins for the second month will increase to $1000 from $300 for clearing members, to $1100 from $935 for members, and to $1350 from $450 for customers. The margins on the third to fifth months will increase to $850 from $300 for clearing members, to $935 from $330 for members, and to $1,148 from $405 for customers. Margins on all other months will increase to $650 from $300 for clearing members, to $715 from $330 for members, and to $878 from $405 for customers.

The margins for the first month of the NGPL Mid–Continent basis swap futures contract will remain the same. The margins on the second month will increase to $550 from $400 for clearing members, to $605 from $440 for members, and to $743 from $540 for customers. Margins on the third to sixth month will increase to $600 from $300 for clearing members, to $660 from $330 for members, and to $810 from $405 for customers. The margins on the seventh to 12th months will increase to $550 from $300 for clearing members, to $605 from $330 for members, and to $743 from $405 for customers. Margins on all other months will remain unchanged.

The margins for the first month of the Tennessee, LA 500 basis swap futures contract will remain the same. Margins on all other months will decrease to $150 from $175 for clearing members, to $165 from $193 for members, and to $203 from $236 for customers.

Margins for the first month of the Northwest pipeline, Rockies basis swap futures contract will remain the same. The margins on the second month will increase to $800 from $500 for clearing members, to $880 from $550 for members, and to $1,080 from $675 for customers. Margins on the third to sixth month will increase to $900 from $400 for clearing members, to $990 from $440 for members, and to $1,215 from $540 for customers. The margins on the seventh to 12th months will increase to $600 from $300 for clearing members, to $660 from $330 for members, and to $810 from $405 for customers. Margins on all other months will increase to $500 from $200 for clearing members, to $550 from $220 for members, and to $675 from $270 for customers.

The margins for the first month of the Socal basis swap futures contract will remain the same. Margins on the second month will increase to $800 from $400 for clearing members, to $880 from $440 for members, and to $1,080 from $540 for customers. Margins on the third to sixth month will increase to $850 from $400 for clearing members, $935 for members, and $1,148 from $540 for customers. The margins on the seventh to 12th months will increase to $650 from $400 for clearing members, $715 from $440 for members, and $878 from $540 for customers. The margins on all other months will increase to $500 from $400 for clearing members, $550 from $440 for members, and $675 from $540 for customers.

The margins for the first month of the Trunkline, LA basis swap futures contract will remain the same. Margins on all other months will increase to $100 from $50 for clearing members, to $110 from $55 for members, and to $135 from $68 for customers.

The margins for the first month of the Waha basis swap futures contract will remain the same. Margins on the second month will increase to $700 from $500 for clearing members, to $770 from $550 for members, and to $945 from $675 for customers. Margins on the third to sixth month will increase to $850 from $500 for clearing members, $935 for members, and $1,148 for customers. The margins on the seventh to 12th months will remain unchanged at $500 for clearing members, $550 for members, and $675 for customers. The margins on all other months will decrease to $300 from $500 for clearing members, $330 from $550 for members, and $405 from $675 for customers.

Margins for the first month of the Texas Eastern Zone M–3 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 on all other months will decrease to $350 from $500 for clearing members, to $385 from $550 for members, and to $473 from $675 for customers.

The margins for the first month to sixth of the Transco Zone 6 basis swap futures contract will remain the same. The margins on the seventh to 12th months will decrease to $300 from $1,000 for clearing members, to $330 from $1,100 for members, and to $405 from $1,350 for customers. Margins on all other months will increase to $400 from $1,000 for clearing members, to $440 from $1,100 for members, and to $540 from $1,350 for customers.

The margins for the first month of the PGE&E Malin basis swap futures contract will remain the same. Margins for the second month will increase to $1000 from $400 for clearing members, to $1,100 from $440 for members, and to $1,350 from $540 for customers. Margins on the third to fifth months will increase to $850 from $400 for clearing members, to $935 from $440 for members, and to $1,148 from $540 for customers. The margins on all other months will increase to $600 from $400 for clearing members, to $660 from $440 for members, and $810 from $540 for customers.

Margins for the first month of the PGE&E Citygate basis swap futures contract will remain the same. Margins for the second month will increase to $1,000 from $300 for clearing members, to $1,100 from $330 for members, and to $1,350 from $405 for customers. The margins on the third to fifth month will increase to $850 from $300 for clearing members, to $935 from $330 for members, and to $1,148 from $405 for customers. Margins on all other months will increase to $600 from $300 for clearing members, $660 from $330 for members, and $810 from $405 for customers.

The margins for the first month of the NGPL Tex/OK basis swap futures contract will remain the same. Margins on the second month will increase to $350 from $300 for clearing members, to $385 from $330 for members, and to $473 from $405 for customers. Margins on the third to sixth month will increase to $450 from $300 for clearing members, $495 for members, and $608 for customers. The margins on the seventh to 12th months will increase to $500 from $300 for clearing members, $550 from $330 for members, and $675 from $405 for customers. The margins on all other months will decrease to $200 from $300 for clearing members, $220 from $330 for members, and $270 from $405 for customers.

Margins for the first month of the Northern Natural Gas Demarcation basis swap futures contract will remain the same. Margins for the second month increased to $800 from $400 for clearing members, to $550 from $440 for members, and to $1,080 from $540 for customers. The margins on the third to fifth month will increase to $500 from $400 for clearing members, to $550 from $440 for members, and to $675 from $540 for customers. Margins on all other months will increase to $600 from $400 for clearing members, $660 from $440 for members, and $810 from $540 for customers.

The margins for the first month of the Northern Natural Gas Ventura, Iowa basis swap futures contract will remain the same. Margins for the second month will increase to $800 from $300 for clearing members, to $880 from $330 for members, and to $1,080 from $405 for customers. Margins on the third to fifth month will increase to $500 from $300 for clearing members, to $550 from $330 for members, and to $675 from $405 for customers. Margins on all other months will increase to $600 from $400 for clearing members, $660 from $440 for members, and $810 from $405 for customers.

The margins for the first and second month of the PGE&E Citygate basis swap futures contract will remain the same. Margins on the third to fifth month will increase to $500 from $300 for clearing members, to $550 from $330 for members, and to $675 from $405 for customers. The margins on all other months will be $600 for clearing members, $660 for members, and $810 for customers.

Margins for the first month of the Panhandle basis swap futures contract will increase to $600 from $500 for clearing members, to $660 from $550 for members, and to $810 from $675 for customers. The margins on the second month will increase to $550 from $200 for clearing members, to $605 from $220 for members, and to $743 from $270 for customers. Margins on the third to 12th months will increase to $600 from $200 for clearing members, $660 from $220 for members, and $810 from $270 for customers. The margins on all other months will increase to $350 from $200 for clearing members, $385 from $220 for members, and $473 from $270 for customers.

The margins for the first month of the Permian basis swap futures contract will remain the same. Margins on the second month will increase to $800 from $500 for clearing members, to $880 from $550 for members, and to $1,080 from $675 for customers. The margins on the third to sixth month will increase to $900 from $500 for clearing members, $990 from $550 for members, and $1,215 from $675 for customers. Margins on the seventh to 12th months will increase to $550 from $500 for clearing members, $605 from $550 for members, and $743 for from $675 customers. The margins on all other months will decrease to $300 from $500 for clearing members, $330 from $550 for members, and $405 from $675 for customers.

The margins for the first month of the Transco Zone 4 basis swap futures contract will remain the same. Margins on the second to sixth month will increase to $150 from $75 for clearing members, to $165 from $83 for members, and to $203 from $101 for customers. The margins on all other months will remain unchanged.

Margins for the first month of the Eastern South/STX basis swap futures contract month will decrease to $800 from $900 for clearing members, to $880 from $990 for members, and to $1,080 from $1,215 for customers. The margins on the second to sixth month will decrease to $550 from $650 for clearing members, to $605 from $715 for members, and to $743 from $878 for customers. Margins on all other months will remain unchanged.

Intra–commodity spread margins for the first and second month of the Houston Ship Channel, Socal, Waha, NGPL Tex/OK, Panhandle, and Permian basis swap futures contract will remain the same. The margins on all other months will be $25 for clearing members, $28 for members, and $34 for customers.

The intra–commodity spread margins for the first to fifth months of the MichCon, SUMAS, PGE&E Malin, PGE&E Citygate, Iowa futures contract will remain the same. The margins on all other months will be $25 for clearing members, $28 for members, and $34 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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