I would speculate that there is a catalyst coming this week. Could be a big one if one of these is PRed:
-Cohort 10 news for Kevetrin -Phase 3 news for Brilacidin ABSSSI--FDA meeting outcomes including fast-track definitions -Phase 2 start and protocol Brilacidin OM--FDA meeting outcomes including fast-track definitions -Phase 2 or 2/3 news Prurisol-- -All 4 of the above.
Long-shot-Big Pharma deal for any one of the above shortly after Phase 3 news about FDA meeting outcomes.
Those not realizing more catalysts are in play are profit taking.