12 Days of Trading – Day 4 of 12: Periodic Auctions
27 August 2025
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Just as market share and trade size give us measures of market quality for lit markets, similar metrics can be applied to periodic auctions. The overall share of periodic auctions as a mechanism has been remarkably stable over the last year but the share and average size amongst the various operators have been changing. Today we take a snapshot of the most recent monthly picture. Note that in this example we have excluded on-demand auctions, offered by some primary venues.
Our Liquidity Cockpit allows the identity of these venues to be revealed to enable you to ask if you are sourcing the best liquidity, at the best price, by market, by venue, by index or at stock level.
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On our 12 Days of Trading
As the year draws to a close we have been asked by clients to repeat our festive exercise on the 12 days leading up to the holidays. As a result, you will find a post to a different 2019 big-xyt observation each day. We look and highlight trends since the introduction of MiFID II with a focus on this year’s changes or events.
We hope you enjoy them.
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This content has been created using the Liquidity Cockpit API.
About the Liquidity Cockpit
At big-xyt we take great pride in providing solutions to the complex challenges of data analysis. Navigating in fragmented markets remains a challenge for all participants. We recognise that the investing community needs and expects continued innovation as the volume of data and related complexity continues to increase.
Our Liquidity Cockpit is now recognised as an essential independent tool for exchanges, Sell-side and increasingly Buy-side market participants. Data quality is a key component, as is a robust process for normalisation so that like-for-like comparisons and trends over time have relevance. However, our clients most value a choice of flexible delivery methods which can be via interactive dashboard or direct access to underlying data and analysis through CSV, API or other appropriate mechanism.
