I went through the CFTC’s alphabetical listing, and pulled out all the retail forex brokers I could identify. For what it’s worth, they are listed below in order, according to adjusted net capital. Notice that some of these brokers are not just forex brokers; some handle both futures and forex; some are also stocks and options dealers; and two of them (Citi Group and Deutsche Bank) are large commercial banks (and interbank participants), as well as being retail forex brokers. All of the FCM’s in the CFTC report are U.S. corporations or LLC’s, regulated by the CFTC and the NFA (or other industry self-regulatory body). Foreign-domiciled brokers, such as Saxo Bank (Danish), Dukascopy (Swiss) and ACM (Swiss), are regulated by government agencies in their own countries, and do not appear in the CFTC listing. Also, introducing brokers (IB’s) do not appear.
Here are the U.S. forex brokers currently listed as FCM’s by the CFTC, ranked according to Adjusted Net Capital, as of 1/31/09:
CITIGROUP GLOBAL MARKETS INC* - (CitiFX) ---- $ 7,149,522,573
DEUTSCHE BANK SECURITIES INC* - (dbFX) ----- $ 5,901,107,907
MF GLOBAL INC** - (MFG) ----------------------- $ 657,659,591
INTERACTIVE BROKERS LLC* --------------------- $ 618,460,008
OANDA CORPORATION --------------------------- $ 169,501,514
GAIN CAPITAL GROUP LLC (Forex.com) ----------- $ 107,390,780
FOREX CAPITAL MARKETS LLC - (FXCM) ----------- $ 98,456,604
ROSENTHAL COLLINS GROUP LLC* - (RCG) --------- $ 86,237,076
GLOBAL FUTURES & FOREX LTD* - (GFT) ---------- $ 76,055,556
FX SOLUTIONS LLC - (FXSol) --------------------- $ 43,785,065
INTERBANK FX LLC - (IBFX) ----------------------- $ 39,945,958
CAPITAL MARKET SERVICES LLC - (CMS) ---------- $ 29,255,080
PEREGRINE FINANCIAL GROUP INC* - (PFG-BEST) – $ 26,005,257
IG MARKETS INC* -------------------------------- $ 24,132,296
FOREX CLUB FINANCIAL COMPANY INC ------------- $ 22,409,695
ADVANCED MARKETS LLC ------------------------- $ 19,873,581
ALPARI (US) LLC --------------------------------- $ 19,690,941
ODL SECURITIES INC* ---------------------------- $ 19,572,976
IKON GLOBAL MARKETS INC* ---------------------- $ 16,548,536
I TRADE FX LLC ---------------------------------- $ 16,081,083
GFS FOREX & FUTURES INC - (GFS) --------------- $ 15,957,382
EASY FOREX US LTD ----------------------------- $ 15,440,303
MB TRADING FUTURES INC* - (MBT) -------------- $ 15,227,957
MG FINANCIAL LLC*** - (MG Forex) --------------- $ 5,406,476
- denotes forex brokers engaged in one or more of the following: futures, options, equities and/or banking.
** MF Global handles spot forex transactions for institutional clients, but not for retail customers.
*** MG Financial is a wholly-owned subsidiary of Rosenthal Collins Group, whose capital supports MG Financial. Note that, by itself, MG Financial does not meet the current CFTC Net Capital Requirement of $15,000,000 for forex brokers.
Use these numbers as a rough guide only. Adjusted Net Capital is not the same thing as market share, although it might serve as a rough proxy. The CFTC probably has data on market share, but it is not made public.