Final two installments in the series have been posted . . . the claim is made that UBS was involved in trading penny stocks in some complicated tax shelter/money laundering scheme. Knight and UBS were trading all the same penny stocks, and were on opposite sides of the trade? UBS was long and Knight was short?. I don't know, maybe? Not clear on how the scam worked exactly. Knight actually seems to have a pretty good business model . . . being short all of this dreck while also collecting the spread/commisions on billions of shares traded seems like a good business. I suspect that's how IBKR makes a lot of money (high commissions on penny stocks).