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Trading activity and price impact in parallel markets: SETS vs. off-book market at the London Stock Exchange


  • Angelo Carollo
  • Gabriella Vaglica
  • Fabrizio Lillo
  • Rosario N. Mantegna


We study empirically the trading activity in the electronic on-book segment and in the dealership off-book segment of the London Stock Exchange, investigating separately the trading of active market members and of other market participants who are non-members. We find that (i) the volume distribution of off-book transactions has a significantly fatter tail than that of on-book transactions, (ii) groups of members and non-members can be classified in categories according to their trading profile, (iii) there is a strong anticorrelation between the daily inventory variation of a market member due to on-book market transactions and an inventory variation due to off-book market transactions with non-members, and (iv) the autocorrelation of the sign of the orders of non-members in the off-book market is slowly decaying. We also analyse the on-book price impact function over time, both for positive and negative lags, of the electronic trades and of the off-book trades. The unconditional impact curves are very different for the electronic trades and the off-book trades. Moreover, there is a small dependence of the impact on the volume for the on-book electronic trades, while the shape and magnitude of the impact function of off-book transactions strongly depend on volume.

Suggested Citation

  • Angelo Carollo & Gabriella Vaglica & Fabrizio Lillo & Rosario N. Mantegna, 2012. "Trading activity and price impact in parallel markets: SETS vs. off-book market at the London Stock Exchange," Quantitative Finance, Taylor & Francis Journals, vol. 12(4), pages 517-530, November.
  • Handle: RePEc:taf:quantf:v:12:y:2012:i:4:p:517-530
    DOI: 10.1080/14697688.2012.664910

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    Cited by:

    1. Michele Tumminello & Fabrizio Lillo & Jyrki Piilo & Rosario N. Mantegna, 2011. "Identification of clusters of investors from their real trading activity in a financial market," Papers 1107.3942,
    2. Federico Musciotto & Luca Marotta & Salvatore Miccich`e & Jyrki Piilo & Rosario N. Mantegna, 2015. "Patterns of trading profiles at the Nordic Stock Exchange. A correlation-based approach," Papers 1511.06873,

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