Matching in size: How market impact depends on the concentration of trading

11 January 2021

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This article aims to show that filling an order with a large number of distinct counterparts incurs additional market impact, as opposed to filling the order with a small number of counterparts. For best execution, therefore, it may be beneficial to opportunistically fill orders with as few counterparts as possible in Large-in-scale (LIS) venues.


It introduces the concept of concentrated trading, a situation that occurs when a large fraction of buying or selling in a given time period is done by one or a few traders, for example when executing a large order. Using London Stock Exchange data, we show that concentrated trading suffers price impact in addition to impact caused by (smart) order routing. However, when matched with similarly concentrated counterparts on the other side of the market, the impact is greatly reduced. This suggests that exposing an order on LIS venues is expected to result in execution performance improvement.

Note: The opinions expressed in this article are those of the author and do not necessarily reflect the views or opinions of Aspect Capital Limited. Any opinions expressed are subject to change and should not be interpreted as investment advice or a recommendation. Any person making an investment in an Aspect Product must be able to bear the risks involved and should pay particular attention to the risk factors and conflicts of interests sections of each Aspect Product’s offering documents. No assurance can be given that any Aspect Product’s investment objective will be achieved.

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