MIR 3.5.9

For the purpose of Rule 3.5.7(b), a negotiated transaction shall mean a transaction involving Members or participants of a Recognised Investment Exchange which is negotiated privately but executed within the Recognised Investment Exchange and where that Member or participant in doing so undertakes one of the following tasks:
(a) dealing on own account with another Member or participant who acts for the account of a Client;
(b) dealing with another Member or participant, where both are executing orders on own account;
(c) acting for the account of both the buyer and seller;
(d) acting for the account of the buyer, where another Member or participant acts for the account of the seller; or
(e) trading for own account against a Client order.