Personally, I think the MM's are manipulating this as we constantly see huge drops during the day to shake loose any shares in the event investors have stop losses set. The share price typically then goes back up.
Whether or not we are bashers, flippers, or long term, the bottom line is the PPS will increase once ARTI generates some constant positive revenue. Till then, I think we will all be on a very long roller coaster ride. GLTA