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The effect of fragmentation in trading on market quality in the UK equity market

Authors: Lena Boneva (Körber) , Oliver Linton and Michael Vogt
Date: 27 August 2013
Type: cemmap Working Paper, CWP42/13
DOI: 10.1920/wp.cem.2013.4213


We investigate the effects of fragmentation in equity trading on the quality of the trading outcomes, specifically volatility, liquidity and volume. We use panel regression methods on a weekly dataset following the FTSE350 stocks over the period 2008-2011, which provides a lot of cross-sectional and time series variation in fragmentation. This period coincided with a great deal of turbulence in the UK equity markets which had multiple causes that need to be controlled for. To achieve this, we use a version of the common correlated effects estimator (Pesaran, 2006). One finding is that volatility is lower in a fragmented market when compared to a monopoly. Trading volume at the London Stock Exchange is lower too, but global trading volume is higher if order flow is fragmented across multiple venues. When separating overall fragmentation into visible fragmentation and dark reading, we find that the decline in LSE volume can be attributed to visible fragmentation, while the increase in global volume is due to dark trading.

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Now published:
Lena Boneva (Körber), Oliver Linton and Michael Vogt February 2016, The effect of fragmentation in trading on market quality in the UK equity market, Journal Article, Wiley Online Library

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