News Release

NYMEX to Change Margins for Natural Gas and Related Futures Contracts

Wed Mar 29 2006

NEW YORK, N.Y., March 29, 2006 — The New York Mercantile Exchange, Inc., today announced margin changes for its natural gas, NYMEX miNYTM natural gas, Henry Hub swing swap, Henry Hub swap, and Henry Hub penultimate swap futures contracts, as of the close of business on March 30.

Margins for the first month of the natural gas futures contract will decrease to $6,500 from $7,500 for clearing members, to $7,150 from $8,250 for members, and to $8,775 from $10,125 for customers. The margins on the second to sixth months will decrease to $6,000 from $6,500 for clearing members, to $6,600 from $7,150 for members, and to $8,100 from $8,775 for customers. Margins on all other months remain unchanged.

The margins for the first month of the Henry Hub swap futures and Henry Hub penultimate swap futures contract will decrease to $1,625 from $1,875 for clearing members, to $1,788 from $2,063 for members, and to $2,194 from $2,531 for customers. The margins on the second to sixth months will decrease to $1,500 from $1,625 for clearing members, to $1,650 from $1,788 for members, and to $2,025 from $2,194 for customers. Margins on all other months remain unchanged.

Margins for the first month of the NYMEX miNYTM natural gas futures contract will decrease to $1,625 from $1,875 for clearing members, to $1,788 from $2,063 for members, and to $2,194 from $2,531 for customers. Margins on the second month will decrease to $1,500 from $1,625 for clearing members, to $1,650 from $1,788 for members, and to $2,025 from $2,194 for customers.

The margins for the first month of the Henry Hub swing swap futures contract will decrease to $1,625 from $1,875 for clearing members, to $1,788 from $2,063 for members, and to $2,194 from $2,531 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: Brenda Guzman , 212-299-2436

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