There will need to be one distinct complaint and class period defining a securities class action case. The first omission or misstatement (later revealed) marks the start of the class period. There may be further related later disclosures before the truths is revealed. Revealing the truth may and often do have related events, where the last disclosure marks the class period end date, which must also be associated with a stat sig priced drop as compared to the overall marker and appropriate sector. The class period dates are often changed from those in the initial complaint through amended complaints as more information comes to light.
In principle two different complaints making a distinct claim and with different class periods could be filed about the same time, but I have never seen that in practice (having reviewed a ton of cases to define requirements for a system that among other features automatically track and organises related cases). I suppose an argument that both the Anavex Rett and AD trials share a common claim of misstatements and or omissions is possible and unfolding over an extensive class period could be made, but they would need to be of exact same nature and related.
Again we will really only know how this will develop until after 12th May, when we know and have read any and all motions for lead plaintiff. There is a first for everything, as they say. I would think though that any joiners will be around Rett given the endpoint change debacle, whereas the AD situation is just mixed results and not unexpected or 'hard sold' otherwise by Anavex (except for the all endpoints met statement that is hard to see how could be true but can be flavoured).
The longer we wait, the sooner we will get rich!
