News Release

NYMEX to Change Margins for Natural Gas, Related Futures Contracts

Thu Jul 26 2007


NEW YORK, NY, July 26, 2007 — The New York Mercantile Exchange, Inc. today announced margin changes for its natural gas; Henry Hub swap, swing swap, and penultimate swap; natural gas penultimate and last day financial; and NYMEX miNYTM natural gas futures contracts, effective at the close of business tomorrow.

Margins for the first month of the natural gas, natural gas penultimate financial and natural gas last-day financial futures contracts will increase to $6,500 from $5,000 for clearing members, to $7,150 from $5,500 for members, and to $8,775 from $6,750 for customers. Margins for the second month will increase to $7,500 from $6,000 for clearing members, to $8,250 from $6,600 for members, and to $10,125 from $8,100 for customers. Margins for the third to seventh months will increase to $7,000 from $6,500 for clearing members, to $7,700 from $7,150 for members, and to $9,450 from $8,775 for customers. Margins for the eighth to 19th months will decrease to $5,500 from $7,000 for clearing members, to $6,050 from $7,700 for members, and to $7,425 from $9,450 for customers. Margins for the 20th to 31st months will decrease to $4,500 from $5,000 for clearing members, to $4,950 from $5,500 for members, and to $6,075 from $6,750 for customers. Margins for the 32nd to 43rd months will decrease $3,500 from $4,000 for clearing members, to $3,850 from $4,400 for members, and to $4,725 from $5,400 for customers. Margins for all other months will remain the same.

Margins for the first month of the NYMEX miNY natural gas and Henry Hub swap and penultimate swap futures contracts will increase to $1,625 from $1,250 for clearing members, to $1,788 from $1,375 for members, and to $2,194 from $1,688 for customers. Margins for the second month will increase to $1,875 from $1,500 for clearing members, to $2,063 from $1,650 for members, and to $2,531 from $2,025 for customers. Margins for the third to seventh months will increase to $1,750 from $1,625 for clearing members, to $1,925 from $1,788 for members, and to $2,363 from $2,194 for customers. Margins for the eighth to 19th months will decrease to $1,375 from $1,750 for clearing members, to $1,513 from $1,925 for members, and to $1,856 from $2,263 for customers. Margins for the 20th to 31st months will decrease to 1,125 from $1,250 for clearing members, to $1,238 from $1,375 for members, and to $1,519 from $1,688 for customers. Margins for the 32nd to 43rd months will decrease $875 from $1,000 for clearing members, to $963 from $1,100 for members, and to $1,181 from $1,350 for customers. Margins for all other months will remain the same.

Margins for the Henry Hub swing swap futures contract will increase to $1,625 from $1,250 for clearing members, to $1,788 from $1,375 for members, and to $2,194 from $1,688 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.

Brenda Guzman 212-299-2436 or  Keil Decker 212-299-2209

Corporate Communications

+1 312 930 3434
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