You left out what is (IMO) the most likely explanation. If MNTA’s officers have in fact terminated their 10b5-1 plans (which is something we don’t know yet), the company is probably in discussions about being acquired.
I understand why you're very careful with your posts, but I'm glad that you finally just came out and said that.
All that is needed to make a happy life is within yourself, in your way of thinking. -Marcus Aurelius