Soleus and MS upped their holdings in Q3Soleus added 316,000 shares and Morgan Stanley added 209,000. That is a very good sign, particularly regarding Soleus and their cancer expertise. So far, there are not any big sellers in the holdings updates that have come through so far.
The 7.5 million share after hours block trade is a bit of a mystery but it may be nothing other than Morgan Stanley having changed something regarding their holdings. It turns out MS owned a little more than 7.5 million shares so they are the most likely firm to have been involved in whatever happened.