News Release

NYMEX to Change Margins for the RBOB Gasoline Futures Contracts

Wed Mar 15 2006

NEW YORK, N.Y., March 15, 2006 — The New York Margins for the first month of the New York Harbor gasoline blendstock futures contract will increase to Mercantile Exchange, Inc., announced that it will change margins for the New York Harbor gasoline blendstock (RBOB) futures contract, effective at the close of business tomorrow.

Margins for the first month of the New York Harbor gasoline blendstock futures contract will increase to $5,500 from $4,500 for clearing members; to $6,050 from $4,950 for members; and to $7,425 from $6,075 for customers. The margins for the second through fifth months will increase to $5,000 from $4,500 for clearing members; to $5,500 from $4,950 for members; and to $6,750 from $6,075 for customers. Margins on all other months will remain unchanged.

The intra–commodity spread margins for the first month will decrease to $250 from $500 for clearing members; to $275 from $550 for members; and to $338 from $675 for customers. Intra–commodity spread margins for the second through fifth months will decrease to $250 from $300 for clearing members; to $275 from $330 for members; and to $338 from $405 for customers. Margins on 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: Brenda Guzman , 212-299-2436

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