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STOCK EXCHANGE NOTICE

DOMESTIC MARKET

WHEN ISSUED DEALING - CMC Markets PLC (CMCM)


1.     When Issued dealing will be permitted in the ordinary shares of CMC Markets PLC (ISIN:
       GB00B14SKR37, TIDM: CMCM) under rule 7050 of the Rules of the London Stock Exchange.


2.     CMCM will trade on SETSmm and the timetable for When Issued dealing is as follows:


       When Issued dealing commences                      8:00am Thursday 25 May 2006


       Expected time for listing and
       commencement of unconditional dealing              8:00am Tuesday 31 May 2006


3.     For the purpose of matching settlement instructions in CREST, the Intended Settlement Date for
       When Issued central counterparty transactions from Thursday 25 May 2006 until Tuesday 31 May 2006
       must be calculated on the standard T+3 basis in line with the central counterparty service.  The
       earliest actual settlement date for all transactions is the expected time for listing, 31 May
       2006.


4.     Any comments or queries on this Notice should be addressed to Issuer Implementation,  telephone
       020 7797 4310 (STX 34310) or email:


Nick Bayley

Head of Trading Services

This Stock Exchange Notice will be available on the website at
www.londonstockexchange.com/stockexchangenotices