I'm new to this game and I'm wondering why stocks seem to go in the dumper on earnings reports. I can understand if there terrible but what about the ones that aren't. MTG down 5% on open. Decent earnings DNA down 3% on excellent earnings CPWM down 5.5% on open on sub par earnings. Do the stock makers manipulate the open to shake off the speculators? It seems to me they drop the stock far enough to get you to bump into your stop losses. Then they start to pull it back. Thanks for any words of wisdom.