Quote from def:
Got to set a few things straight on this thread though:
You should be looking a balance sheets, not CFTC lists or funds under management. Client funds are segregated and have nothing to do with a firms well being. It's firm capital and risk management that you should be looking at. Witness MF, Lehman, Bear, ING as examples. IB's business is also different than the Merrill's and the other firms you list so you're comparing apples and oranges.
But since you posted, Client assets: IB has about $30 billion in client assets (not the $17 that you posted). IB is not a hedge fund, doesn't prop trade, doesn't have off balance sheet items or hold any CDS, CDO, or MBS.
Also CFTC capital lists don't show the entire story as that doesn't include all sides of the businesses. For a true picture of a firms capital, you should look at their financials. FWIW, IB Group has over $4.8 Billion in shareholder equity and IB LLC $1.7B.
If strength and security is your main concern, it's easy to argue that IB is one of the safest on the street. A $500K account is very nice and nothing to sniff at but in reality, it is a small amount of assets when looking at the bigger picture. For example, many of the banks/prime brokers won't even look at an account with AUM < $100 million.