Trade it and take some profit if you have a big gain but keep some preferably free shares in your portfolio.
I've got a feeling MM, HDSN wants it to go much higher to allow warrant holders to exercise their warrants which will allow the company to raise much needed cash. Sure that will cause some dilution, but cash to further advance their development will be much more positive going forward.
IMO, this is best small speculative biotech play out there with CANCER vaccines in PI, PII and PIII trading at 12 cents.
GLTY