Firm volumes overall recover nicely following August "glitch".
Brokerage firm Knight Capital -- which famously nearly went under in early August after a trading glitch in its equities business caused a $400 million loss -- announced its volumes for September, and in most key categories things seem to have stabilized. In its Forex ECN unit Hotspot FX, volumes returned to near-normal levels of $25.8 billion daily, up 23% from August's $21 billion.
For more on historical FX trading volumes see the LeapRate Retail FX Volume Index, sponsored by Leverate. And for more generally on the global Forex industry see the LeapRate-Dow Jones Forex Industry Report.
Disclosure: I am long KCG.