Short squeeze. Nano cap & float biotech. Up 90% PM, submission of 510(K) clearance to FDA for 1st Machine Vision System in Robotic Surgery. Topped @ $3 PM. Held $2 after dipping @ market open, longed @ $2.40 when it passed VWAP and held. I held to test $3 for a short squeeze, but I cut my losses when it failed VWAP, right choice as TRXC pummeled. Tweets exposed that TRXC has history of not holding its gains. Lesson. Followed my lesson of cutting losses intelligently e.g. failing VWAP near noon.