Stephens Inc., the Little Rock financial house, is a participating in the $400 million bailout of Knight Capital Group, the market maker that suffered catastrophic losses because of a software failure. Articles I've seen so far don't specify Stephens' share of the investment from a group comprising six firms.
The investors will buy preferred stock convertible into common shares for their cash infusion. The new investors will own most of the company. Old investors will have little.