UK Financial Conduct Authority Revises Market Cleanliness Statistic Methodology

The U.K. Financial Conduct Authority has announced that it is revising the market cleanliness statistic used in its annual report to measure insider trading. In future, the FCA will: (i) detect abnormal price movements that happen on the same day as an announcement because the price information used is more frequent; (ii) introduce a market comparison test to ensure the statistic is less affected by market volatility, for example, that caused by the Covid pandemic or Russia's invasion of Ukraine; and (iii) include more announcements from firms with multiple takeover offers. The revised measure is higher, reflecting the scope of the statistic now including potential insider trading on the day of an announcement. In addition, the new methodology makes the statistic more robust to periods of market volatility. Based on the insights received from reports, alerts, and market intelligence, the FCA has not seen an increase in market abuse. The FCA welcomes feedback from the public, industry and academic community on these changes.

Return to main website.