. Specifically, we focus on the behaviour of bid-askspread, market depth, trading activity, volatility and investor order submission …This study analyses the repercussions of the existence of minimum price variations(ticks) to different market variables …

. Accordingly with the microstructure models that assume the existence of informational asymmetries among investors, the possibility … of trading with insiders is a reason why market makers increase the spread. The verified effect that takeover … market maker detects insiders in this sort of events. Our results do not show significant changes in spread before takeover …