Rule 8.1 - Euronext NV

ABN AMRO BANK N.V. FORM 8.1 DEALINGS BY OFFERORS, OFFEREE COMPANIES OR THEIR ASSOCIATES FOR THEMSELVES OR FOR DISCRETIONARY CLIENTS (Rules 8.1(a) and (b)(i) of the City Code on Takeovers and Mergers) 1. KEY INFORMATION Name of person dealing (Note 1) ABN AMRO BANK NV LONDON BRANCH --------------------------------------------------------------------------------------------------------- Company dealt in EURONEXT NV (NXT.P) --------------------------------------------------------------------------------------------------------- Class of relevant security to which the EUR 1 dealings being disclosed relate (Note 2) --------------------------------------------------------------------------------------------------------- Date of dealing 10th April 2006 --------------------------------------------------------------------------------------------------------- 2. INTERESTS, SHORT POSITIONS AND RIGHTS TO SUBSCRIBE (a) Interests and short positions (following dealing) in the class of relevant security dealt in (Note 3) Long Short -------------------------------------------------------------------------------------------------------- Number Number (%) (%) -------------------------------------------------------------------------------------------------------- (1) Relevant securities 1,009,487 (0.90%) 430,572 (0.38%) -------------------------------------------------------------------------------------------------------- (2) Derivatives (other than options) 1,000,000 (0.90%) -------------------------------------------------------------------------------------------------------- (3) Options and agreements to purchase/sell 1,000,000 (0.90%) -------------------------------------------------------------------------------------------------------- Total 2,009,487 (1.80%) 1,430,572 (1.28%) -------------------------------------------------------------------------------------------------------- (b) Interests and short positions in relevant securities of the company, other than the class dealt in (Note 3) Class of relevant security: Long Short -------------------------------------------------------------------------------------------------------- Number Number (%) (%) -------------------------------------------------------------------------------------------------------- (1) Relevant securities -------------------------------------------------------------------------------------------------------- (2) Derivatives (other than options) -------------------------------------------------------------------------------------------------------- (3) Options and agreements to purchase/sell -------------------------------------------------------------------------------------------------------- Total -------------------------------------------------------------------------------------------------------- (c) Rights to subscribe (Note 3) Class of relevant security: Details --------------------------------------------------------------------------------------------------------- 3. DEALINGS (Note 4) (a) Purchases and sales Purchase/sale Number of securities Price per unit (Note 5) --------------------------------------------------------------------------------------------------------- Sell 808 69.0000 EUR Sell 1,192 69.0500 EUR Sell 7,985 69.1000 EUR Sell 15 69.1500 EUR --------------------------------------------------------------------------------------------------------- (b) Derivatives transactions (other than options) Product name, Long/short (Note 6) Number of securities (Note 7) Price per unit (Note 5) e.g. CFD -------------------------------------------------------------------------------------------------------- (c) Options transactions in respect of existing securities (i) Writing, selling, purchasing or varying Product name, Writing, Number of Exercise Type, e.g. Expiry Option money e.g. call option selling, securities to price American, date paid/received purchasing, which the option European per unit (Note varying etc. relates (Note 7) etc. 5) ------------------------------------------------------------------------------------------------------- (ii) Exercising Product name, e.g. call option Number of securities Exercise price per unit (Note 5) --------------------------------------------------------------------------------------------------------- (d) Other dealings (including new securities) (Note 4) Nature of transaction (Note 8) Details Price per unit (if applicable) (Note 5) --------------------------------------------------------------------------------------------------------- 4. OTHER INFORMATION Agreements, arrangements or understandings relating to options or derivatives Full details of any agreement, arrangement or understanding between the person disclosing and any other person relating to the voting rights of any relevant securities under any option referred to on this form or relating to the voting rights or future acquisition or disposal of any relevant securities to which any derivative referred to on this form is referenced. If none, this should be stated. --------------------------------------------------------------------------------------------------------- Voting rights to pass to the client on a best endeavours basis. --------------------------------------------------------------------------------------------------------- Is a Supplemental Form 8 attached? (Note 9) YES/NO Date of disclosure 11th April 2006 --------------------------------------------------------------------------------------------------------- Contact name Kirit Devshi --------------------------------------------------------------------------------------------------------- Telephone number 020 7678 1904 --------------------------------------------------------------------------------------------------------- Name of offeree/offeror with which associated Euronext NV --------------------------------------------------------------------------------------------------------- Specify category and nature of associate status (Note 10) Adviser --------------------------------------------------------------------------------------------------------- Notes The Notes on Form 8.1 can be viewed on the Takeover Panel's website at www.thetakeoverpanel.org.uk SUPPLEMENTAL FORM 8 DETAILS OF OPEN POSITIONS (This form should be attached to Form 8.1, Form 8.1(b)(ii) or Form 8.3, as appropriate) OPEN POSITIONS (Note 1) Product name, Written or Number of securitiesExercise price Type, e.g. Expiry date e.g. call option purchased to which the option (Note 2) American, or derivative European relates etc. ------------------------------------------------------------------------------------------------------- Call Option Purchase 500,000 63.12 EUR European 10 Feb 2011 ------------------------------------------------------------------------------------------------------- Put Option Written 500,000 40.72 EUR European 10 Feb 2011 ------------------------------------------------------------------------------------------------------- Notes 1. Where there are open option positions or open derivative positions (except for CFDs), full details should be given. Full details of any existing agreements to purchase or to sell should also be given on this form. 2. For all prices and other monetary amounts, the currency must be stated. For details of the Code's dealing disclosure requirements, see Rule 8 and its Notes which can be viewed on the Takeover Panel's website at www.thetakeoverpanel.org.uk

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