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The Asymmetry of the Price Impact of Block Trades and the Bid-Ask Spread. Evidence from the London Stock Exchange


  • Andros Gregoriou

    (Brunel Business School, Economics and Finance Section, Brunel University)


In this paper we examine the price impact of block trades for FTSE 100 firms over the time period 1998-2004. Resembling previous research we find evidence of an asymmetric price impact between block purchases and sales. We suggest that bid-ask bias may be a new conjecture to the asymmetry in the differences in buyer and seller initiated trades.

Suggested Citation

  • Andros Gregoriou, 2007. "The Asymmetry of the Price Impact of Block Trades and the Bid-Ask Spread. Evidence from the London Stock Exchange," Money Macro and Finance (MMF) Research Group Conference 2006 76, Money Macro and Finance Research Group.
  • Handle: RePEc:mmf:mmfc06:76

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    References listed on IDEAS

    1. Engle, Robert F. & Patton, Andrew J., 2004. "Impacts of trades in an error-correction model of quote prices," Journal of Financial Markets, Elsevier, vol. 7(1), pages 1-25, January.
    2. Michael Aitken & Amaryllis Kua & Philip Brown & Terry Watter & H. Y. Izan, 1995. "An Intraday Analysis of the Probability of Trading on the ASX at the Asking Price," Australian Journal of Management, Australian School of Business, vol. 20(2), pages 115-154, December.
    3. Gemmill, Gordon, 1996. " Transparency and Liquidity: A Study of Block Trades on the London Stock Exchange under Different Publication Rules," Journal of Finance, American Finance Association, vol. 51(5), pages 1765-1790, December.
    4. Heflin, Frank & Shaw, Kenneth W., 2000. "Blockholder Ownership and Market Liquidity," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 35(04), pages 621-633, December.
    5. Keim, Donald B & Madhaven, Ananth, 1996. "The Upstairs Market for Large-Block Transactions: Analysis and Measurement of Price Effects," Review of Financial Studies, Society for Financial Studies, vol. 9(1), pages 1-36.
    6. Lease, Ronald C & Masulis, Ronald W & Page, John R, 1991. " An Investigation of Market Microstructure Impacts on Event Study Returns," Journal of Finance, American Finance Association, vol. 46(4), pages 1523-1536, September.
    7. Jennifer S. Conrad, 2001. "Institutional Trading and Soft Dollars," Journal of Finance, American Finance Association, vol. 56(1), pages 397-416, February.
    8. Ellis, Katrina & Michaely, Roni & O'Hara, Maureen, 2000. "The Accuracy of Trade Classification Rules: Evidence from Nasdaq," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 35(04), pages 529-551, December.
    9. Harris, Lawrence, 1989. "A Day-End Transaction Price Anomaly," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 24(01), pages 29-45, March.
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    Cited by:

    1. Luisella Bosetti & Pietro Gottardo & Maurizio Murgia & Andrea Pinna, 2014. "The Impact of Large Orders in Electronic Markets," BEMPS - Bozen Economics & Management Paper Series BEMPS15, Faculty of Economics and Management at the Free University of Bozen.
    2. Ren, Fei & Zhong, Li-Xin, 2012. "The price impact asymmetry of institutional trading in the Chinese stock market," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 391(8), pages 2667-2677.
    3. Alex Frino & Vito Mollica & Maria Grazia Romano, 2013. "Transaction fees and trading strategies in financial markets," STUDI ECONOMICI, FrancoAngeli Editore, vol. 2013(111), pages 25-49.
    4. Murphy Jun Jie Lee, 2013. "The Microstructure of Trading Processes on the Singapore Exchange," PhD Thesis, Finance Discipline Group, UTS Business School, University of Technology, Sydney, number 4.
    5. Fei Ren & Li-Xin Zhong, 2011. "Price impact asymmetry of institutional trading in Chinese stock market," Papers 1110.3133,

    More about this item


    Block Trades; Bid-Ask Bias; Asymmetry; Market Microstructure;

    JEL classification:

    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading

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