We don't cover ARRT, and we'd rather say so than guess.
Artisan Consumer Goods, Inc. (ARRT) is a $1M-cap name with thin filing history and little wire coverage. There isn't enough source material to explain a move honestly — and an explanation we can't source is worse than none.
Small caps with no filings and no coverage produce bad explanations. Drawing the line publicly is the point — it's how you know every other answer here means something.