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
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Company dealt in                          EURONEXT NV (NXT.P)
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Class of relevant security to which the   EUR 1
 dealings being disclosed relate (Note 2)
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Date of dealing                           28th March 2006
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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
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                                          Number                        Number
                                                       (%)                             (%)
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(1) Relevant securities                                1,001,057 (0.90%)                 396,572 (0.35%)
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(2) Derivatives (other than options)                                                   1,000,000 (0.90%)
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(3) Options and agreements to
 purchase/sell                                         1,000,000 (0.90%)
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Total                                                  2,001,057 (1.80%)               1,396,572 (1.25%)
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(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
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                                          Number                        Number
                                                       (%)                             (%)
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(1) Relevant securities
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(2) Derivatives (other than options)
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(3) Options and agreements to
 purchase/sell
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Total
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(c) Rights to subscribe (Note 3)

Class of relevant security:               Details
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3. DEALINGS (Note 4)

(a) Purchases and sales

Purchase/sale                      Number of securities              Price per unit (Note 5)
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Sale                               8,000                             64.0500 EUR
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(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
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(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)
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(ii) Exercising

Product name, e.g. call option     Number of securities              Exercise price per unit (Note 5)
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(d) Other dealings (including new securities) (Note 4)

Nature of transaction (Note 8)     Details                           Price per unit (if applicable) (Note
                                                                      5)
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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.
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Voting rights to pass  to the client on a best endeavours basis.
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Is a Supplemental Form 8 attached? (Note 9) YES/NO

Date of disclosure                                          29th March 2006
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Contact name                                                Mark Burnham
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Telephone number                                            020 7678 5898
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Name of offeree/offeror with which associated               Euronext NV
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Specify category and nature of associate status (Note 10)   Adviser
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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.
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Call Option        Purchase                  500,000 63.12 EUR       European     10 Feb 2011
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Put Option         Written                   500,000 40.72 EUR       European     10 Feb 2011
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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