Many of the warrant holders have restrictions when they can sell. Most wait until NP gives them an offer they can't refuse -- discount conversions, lift any time restriction and they exit quickly.
The stock has declines over 80% from the 52 week high, down over 50% in 52 weeks, has repeatedly been setting new 52 week lows. What investor in their right mind would look at that as a positive investment. Only naïve retail investors enthralled with "the science" even when LL has failed every trial other than HIV combo Phase 3. Not much impressive about the science.