Abstract:In this paper we examine the effect of corporate governance mechanisms on asymmetric information. Using a sample of 392 non-financial UK companies listed on the London Stock Exchange, we find that proxies for board independence, board activeness, performance related executive compensation and debt financing are significantly negatively related to the degree of asymmetric information (as reflected in bid-ask spreads, volatility of returns and market price volume of shares traded), whereas ownership concentration is significantly positively related to asymmetric information. The results indicate that the UK companies in our sample have a high degree of compliance with the combined code on corporate governance, and as a result are likely to have higher market values.2