In that reporting period that you chose to reference, Forex Capital Management (FXCM) still had more assets under management:
Adjusted net capital 55,233,641 vs. 36,194,560 (Oanda) and just one month later those figures are 65,845,152 (FXCM) vs. 18,263,754 (Oanda)
There are 2 designations...