Quote from Jerkstore:
This is very interesting. The problem though, is that the market manipulation rules are unclear. Nowhere in the SEC or FINRA documentation can anyone find a definition of market manipulation.
It is natural for a market to back off from a large resting order. Other's will "lean" on this order and bounce their trading prices off of it. So, these guys simply created an order for others to "lean" on, traded the other side, then yanked their large working order.
I have seen that maneuver pulled by almost every trading company I have ever been around. I supposed the difference would be that most companies don't write this into their code, and simply do it maually--or in open outcry market making.
I am very curious if the SEC and FINRA will actually define manipulation, and give a few examples of what is not allowed, vs what is acceptable business practices.
The problem here, is the masssive grey area created by unclear regulations.