User blog comment:Wrath022/Episode 276: Challenger, Review/@comment-1359322-20160323155143/@comment-7418318-20160323185600

A1 is the "manager" of the anime and was so from episode 1 up to the currnet ones (both old AND new anime). They don't do the animation.

The animation was done by Satelight in the old and Bridge in the new anime.