And while they're at it the SEC should investigate the...

And while they're at it the SEC should investigate the proprietary trading software of these companies. Hard to believe that a company with algorthms that 'in the wrong hands could maninupulate the markets' being antagonised by the regulators won't use it AGAINST them.

The big investment banks have already proven they are capable of selling an investment AND at the same time betting against it, so it's not a stretch to assume they're willing to use these algorithms to corrupt markets for their own gain.

In fact, it's not too much of a stretch to assume the selloff in markets overnight was caused by the algorithms of these big banks (trying to prove a point).