News Release

NYMEX to Extend Contract Months for Natural Gas Basis Futures Contracts on NYMEX ClearPort®

Thu Aug 17 2006

NEW YORK, N.Y., August 17, 2006 — The New York Mercantile Exchange, Inc., announced today that it will extend the contract months for 32 natural gas basis swap futures contracts on NYMEX ClearPort beginning on August 20 for trade date August 21. Trading in these contracts is available for the 36 consecutive months but will be extended to 72 consecutive months. The listing schedule will be the same as the natural gas futures contract, which currently trades out to December 2011 and will add 12 new contract months following the termination of trading of the December contract month.

This extension applies to the following futures contracts: Houston Ship Channel basis swap (Platts IFERC); Alberta basis swap; SoCal basis swap; Panhandle basis swap (Platts IFERC); Northwest Pipeline, Rockies basis swap (Platts IFERC); Texas Eastern M-3 basis swap (Platts IFERC); Dominion basis swap (Platts IFERC); NGPL Tex/OK basis swap (Platts IFERC); Chicago basis swap (NGI); Malin basis swap (NGI); Waha basis swap (Platts IFERC); Columbia Gas Transmission Corp. Appalachia basis swap (Platts IFERC); MichCon basis swap (Platts IFERC); Henry Hub basis swap (Platts IFERC); PG&E Citygate basis swap (NGI); NGPL Mid-Continent basis swap (Platts IFERC); CIG basis swap (Platts IFERC); Transco Zone 6 basis swap (Platts IFERC); Permian basis swap (Platts IFERC); Northern Natural Gas Ventura, Iowa basis swap (Platts IFERC); Sumas basis swap (Platts IFERC); San Juan basis swap (Platts IFERC); Tennessee Zone 0 basis swap (Platts IFERC); Northern Natural Gas Demarcation basis swap (Platts IFERC); ANR Oklahoma basis swap (Platts IFERC); Tetco South Texas basis swap (Platts IFERC); Transco Zone 3 basis swap (Platts IFERC); Columbia Gulf Transmission Onshore basis swap (Platts IFERC); Centerpoint basis (Platts IFERC); Texas Gas, SL basis swap (Platts IFERC); ANR, Louisiana basis swap (Platts IFERC); and SONAT Basis swap futures (Platts IFERC).

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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: Anu Ahluwalia , 212-299-2439

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