(8)The insider lists should also contain data that may assist the competent authorities in the conduct of investigations, and help them to rapidly analyse the trading behaviour of insiders, to establish connections between insiders and persons involved in suspicious trading, and to identify contacts between them at critical times. In this respect, telephone numbers are essential as they permit the competent authority to act swiftly and to request data traffic records, if necessary. Moreover, such data should be provided at the outset, so that the integrity of the investigation is not compromised by the competent authority having to revert in the course of an investigation to the issuer, the emission allowance market participant, the auction platform, the auctioneer, the auction monitor or the insider with further requests for information.