What percentage of volume does automated/algorithmic trading represent for NYSE Euronext?
We don't keep formal records, but for US markets we believe it is somewhere between 50 and 60%.
Have there been any noticeable changes in the ratio between message volume and consummated orders in the last twelve months?
I would say that over the last year it's been pretty stable. However, what we are seeing overall is a general reduction in the size of trades; participants ar