St. Signpost Co., Ltd. (Japanese: 株式会社スタジオ サインポスト, Hepburn: Kabushiki-gaisha Sutajio Sainposuto) is an animation studio subsidiary of Pierrot.

The studio is an associate-member of The Association of Japanese Animations.

[1] The company was founded in 1959 as a magazine advertising agency and stepped into the anime industry in 1989 by Keiji Kusano and Yoshikazu Tochihira.

Ken Hagino, who had worked at Pierrot as animation producer was appointed as the new CEO.

In conjunction with this change, the official website of Arms was closed down, and the company was later dissolved on October 6, 2020.