We show that the presence of high frequency trading (HFT) has significantly mitigated the frequency and severity of end-of-day price dislocation, counter to recent concerns expressed in the media. The effect of HFT is more pronounced on days when end of day price dislocation is more likely to be...

We examine the impact of stock exchange trading rules and surveillance on the frequency and severity of suspected insider trading cases in 22 stock exchanges around the world over the period January 2003 through June 2011. Using new indices for market manipulation, insider trading, and...

This paper examines evidence on colocation dates and their impact on market efficiency. International colocation dates can be sourced from a number of avenues including: [1] an 'exchange's news announcements and reports, [2] news media, and [3] by direct communication with the officers of an...

We consider whether traders are more likely to commit securities violations when trading at home, a new form of working induced by the Covid pandemic. We examine data pre- and post-Covid, during which some traders were unexpectedly forced to work at home. The data indicate the presence of both a...

There are at least three possible times that changes in securities regulations are effective: (1) the date that the securities regulations are put forth (e.g., as in a pan-European Union directive); (2) the date that the new regulations are signed into law; and (3) the date at which new...

While it is not clear from Christensen, Hail, and Leuz (2016), the market abuse rules they examine are the same as in Cumming, Johan, and Li (2011), with a difference in focus on the date: Christensen et al. (2016) pick the date the regulations were signed into law, while Cumming et al. (2011)...