Americans Elect says it is about to submit approximately 72,000 signatures to election officials in Tennessee. The turn-in will be Thursday, March 29. See this story.
The other qualified parties in Tennessee are Democratic, Republican, Green, and Constitution. The latter two got on the ballot by winning a lawsuit. The state is appealing the lawsuit decision, but in the meantime, the plaintiff political parties are on the ballot, because the U.S. District Court has refused to issue a stay of its own opinion. The state, so far at least, has not asked the Sixth Circuit to expedite the appeal.