(4)When publishing the identity of the top five execution venues on which they execute client orders it is appropriate for investment firms to publish information on the volume and number of orders executed on each execution venue, so that investors may be able to form an opinion as to the flow of client orders from the firm to execution venue. Where, for one or several classes of financial instruments, an investment firm only executes a very small number of orders, information on the top five execution venues would not be very meaningful nor representative of order execution arrangements. It is therefore appropriate to require investment firms to clearly indicate the classes of financial instruments for which they execute a very small number of orders.