If it helps, JP wiki says they made a satellite company, GeyeG Pictures, and most of Studio Mother's staff was/is being moved over there. You can cross-check the list of names and it matches up pretty well: www.geyeg-pictures.co.jp
geyeg-pictures.co.jp
GeyeG Pictures
アニメーション制作会社GeyeG Picturesの公式サイト。「熱狂（Geek）の視点（eye）で共鳴し未来を継ぐ」を掲げ、クリエイターが躍動する環境を築きます。