News Release

NYMEX Announces Trading and Processing Schedule for Memorial Day

Tue May 20 2008

NEW YORK, May 20 /PRNewswire/ -- New York Mercantile Exchange, Inc., a subsidiary of NYMEX Holdings, Inc. (NYSE: NMX), today announced a complete trading and processing schedule for the Memorial Day holiday (all in Eastern time):

  Friday May 23, 2008
  -- Normal floor closing for all NYMEX and COMEX products.  Not an early
     closing day.
  -- NYMEX and COMEX products on CME Globex® and NYMEX ClearPort®,
     including DME Direct, open until 5:15 PM for the May 23 trade date.
  -- Large trader reporting for any clearing members holding DME positions
     for the May 23 trade date are due by midnight on Friday.


  Sunday May 25, 2008
  -- NYMEX and COMEX products on CME Globex, NYMEX ClearPort, and DME Direct
     will re-open for trading and trade submission at 6:00 PM for the May 27
     trade date.
  -- Day/session orders entered on CME Globex or DME Direct are for the May
     27 trade date, which will continue until Tuesday's close at 5:15 PM.


  Monday May 26, 2008 (Memorial Day)
  -- DME intraday settlement price to be published at the normal time of
     4:30 AM for the May 26 calendar date. No post-close settlement will be
     published.
  -- NYMEX and COMEX products on CME Globex, NYMEX ClearPort clearing and
     trading, including DME Direct, will be open for trading and trade
     submission until  5:15 PM (for the May 27 trade date).
  -- Day/session orders entered on CME Globex or DME Direct are for the May
     27 trade date, which will continue until Tuesday's close at 5:15 PM.
  -- NYMEX TAS products on CME Globex will be available for trading for the
     May 27 trade date.
  -- NYMEX and COMEX trading floors will be closed.
  -- NYMEX TMS will be available for trade management for the May 27 trade
     date.
  -- NYMEX cleared trades API will be available.
  -- Markets will not be settled and settlements will not be published, as
     May 26 is not a trade or processing date.
  -- NYMEX intraday files will not be produced, no clearing will occur, and
     no clearing functionality will be available.
  -- Daily SPAN and erosion (NERC holiday) files will not be produced.
  -- Options cannot be exercised.
  -- There will not be any allocation of energy and metal deliveries or
     delivery notices and related forms will not be accepted.
  -- First normal intraday file generated on calendar date May 27 will
     contain trades from calendar date May 26 (as all trades are for May
     27th trade date).
  -- NYMEX and COMEX products on CME Globex, NYMEX ClearPort clearing and
     trading, including DME Direct, will re-open for trading and trade
     submission at 6:00 PM ( for the May 27 trade date).


  Tuesday May 27, 2008
  -- Normal schedule will resume.
  -- Banking for the May 23 clearing cycle will occur.
  -- Large trader reporting (NYMEX/COMEX) for the May 23 trade date for any
     clearing members not holding DME positions will be due by 8:00 AM.
  -- Normal erosion for electricity products will occur.  Since May 26 is a
     NERC holiday, "double erosion" is not necessary.

The full NYMEX 2008 Holiday Schedule can be found at: http://www.nymex.com/holida_schedu.aspx

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.

SOURCE: New York Mercantile Exchange, Inc.

CONTACT: Anu Ahluwalia, +1-212-299-2439, or Keil Decker,
+1-212-299-2209, both of New York Mercantile Exchange, Inc.

Web site: http://www.nymex.com/

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+1 312 930 3434
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