(23)High frequency algorithmic trading technique in accordance with Article 4(1)(40) of Directive 2014/65/EU, which is a subset of algorithmic trading, should be further specified through the establishment of criteria to define high message intraday rates which constitutes orders quotes or modifications or cancellations thereof. Using absolute quantitative thresholds on the basis of messaging rates provides legal certainty by allowing firms and competent authorities to assess the individual trading activity of firms. The level and scope of these thresholds should be sufficiently broad to cover trading which constitute high frequency trading technique, including those in relation to single instruments and multiple instruments.