a_r,
I did some followup and you are correct: the form 4s today were insider shareholders who sold into the FPO at $33.00, hence they had to file form 4s.
They ended up with $31.68/share (exactly 4% below $33 which must be commissions to GS)
The biggest seller was the CEO who sold about 18% of his holdings. Personally, I don't blame him. He still owns almost 7% of the company.
The bad news is that these shares aren't part of the ~8.7mm IPO shares coming off restriction on 12/6
The good news is that as of 11/15 there were around 9mm shares short. That could have changed dramatically though as we had a single 9mm share day 11/22. These shorts could cover into the selling and help offset some of the damage.
The other bad news is that 14mm shares are coming off restriction on 12/19 - that could be a dagger. These holders have shares through options that they bought at 65 cents, or participated in the IPO at $19. A $30.00+ share price is a lot of gravy not to take some duckets off the table, especially at a forward PE of around 200 in an uncertain market.
If you trade short term on charts with a negative bias you should come out ok.