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Offer For London Stock Stock Exchange Plc ("LSE") - Announcement Of Acceptance Levels

Date 10/11/2000

Per E. Larsson, President & Chief Executive Officer of OM Group invites you to join a teleconference at 16:00 GMT to discuss the outcome of OM’s offer for London Stock Exchange plc.

If you would like to attend please reply to this invitation by calling Lucinda Sallis at Hill & Knowlton on telephone: +44 (0)207 413 3519 or via email to h&kfinancial@hillandknowlton.com to obtain the required telephone number and access code.

Regards,

Anthony Payne Hill & Knowlton Tel: +44 (0) 20 9973 4489

The Directors of OM accept responsibility for the information contained in this announcement and, to the best of their knowledge and belief (having taken all reasonable care to ensure that such is the case), the information contained in this announcement is in accordance with the facts and does not omit anything likely to affect the import of such information.

Lazard Brothers & Co., Limited ("Lazard") and Enskilda Securities AB ("Enskilda Securities"), which are regulated in the UK by The Securities and Futures Authority Limited, are acting for OM and no-one else in connection with the Increased Offer and will not be responsible to anyone other than OM for providing the protections afforded to customers of Lazard or Enskilda Securities or for giving advice in relation to the Increased Offer.

Words and phrases defined in the Increased Offer Document carry the same meanings in this announcement.

Lazard has approved this announcement solely for the purposes of Section 57 of the Financial Services Act 1986.