Yes, multiple ECNs, not single ECN. The only ones (single or multiples) who does know the trade are your counterpartys who you have sold to and the ECNs over which your trade was executed. Sometimes one ECN is enough to cover your trade, sometimes the trade is splitted over several ECNs, that relies on many factors and also on your broker. As I have no insight into IBKR this is up to speculation. Besides sorry about the 1:60/1:40 leverage maybe we are in different regulation zones.Thanks for all the responses.
So between IBKR and I markets it comes down to leverage (1:60 vs 1:500) and 15% savings in fees.
When you say ECN, isn't that really multiple ECNs? If there is one ECN then there is a universal system. If multiple ECNs then no central one I assume.
If I told you I traded $101,456.00 on June 25 at 10:23:01 am EST, as a third party would you be able to find that on some record without me telling you I did it on IBKR?