The Commodities Futures Trading Commission – CFTC to the well-initiated – today released Financial Data for FCMs for January, 2011. You can click the link above to get the CFTC data.
I download this report every month when CFTC issues it. I sort the spreadsheet version released by CFTC, choosing to sort by Customer Segregated Funds. This is a uniquely U.S.-centric metric, to be sure, but it is a clear measurement of FCM size.
You can download my sorted version here: fcmdata2011-01 Sorted By Seg
UPDATE: For non-U.S. readers: here is the same data sorted by ‘Secured’ funds, aka 30.7 funds: fcmdata2011-01 Sorted By 30.7
HINT: by either measurement, Newedge wins.