This paper examines the patterns of security returns around trades by corporate insiders in the shares of their own company. We find patterns in abnormal returns in the days around a directors trade that are consistent with directors engaging in short-term market timing: they sell (buy) after an...

This paper examines the determinants of inside spreads and their behaviour around corporate earning announcement dates, for a sample of UK firms over the period 1986-94. The paper finds that closing daily inside spreads are affected by order processing costs (proxied by trading volumes),...

This paper investigates the determinants of price quote revisions on the London Stock Exchange for a sample of highly liquid stocks over a two-week settlement period in September 1990. In our theoretical model the level of optimal price quotes set by market makers are a function of the expected...