it was the ones who bought yesterday at 10.5 and this morning on...

it was the ones who bought yesterday at 10.5 and this morning on open at 11 who were dumping

Clearly they had inside knowledge of an announcement but misjudged the impact it would have

They operate by strict trading rules so they just dump and move onto the next one. A lot of the time its brokers who manage discretionary portfolios so they are not even palying with their own money...makes it much easier to accept the loss