Not sure who holds the bulk of the warrants scheduled to expire in April/May. Why do you ask?
We do know that incremental funding NWBO has secured to keep the lights on again and again and again often involved warrants and I don't believe (pure speculation) that those investors are bona fide longs and might be happy to turn around and immediately sell content to make a small profit . . . although we did see that many times there was fine print the prohibited them from selling for several months.