A "super" long-term play that I've been in for over a year or two is ONCS. Why do I call it a "super" long-term play? I'm in it until a bigger fish buys her out or until she becomes a big fish herself. I do believe that there has been some "passive" eyeballing from larger companies as ONCS has a proprietary method in the fight against melanoma, a severe form of skin cancer.
ONCS has been getting some recent exposure as of late, but is still under the radar for most. However, some huge buys have gone through in recent weeks, most likely institutional buyers. Some decent news should come out later this week, imo.