Group TAC (株式会社グループ・タック Kabushiki Kaisha Gurūpu · Takku) was a Japanese animation and computer graphics studio located in Shibuya, Tokyo, and founded in 1968 from former Mushi Pro staff. They have worked on movies, videos, TV shows, and commercials, and have contributed to all stages of the process, including planning, production, sound effects, and so on. The company was headed by Atsumi Tashiro until Tashiro's death in July. In September 2010, Group TAC filed for bankruptcy and went defunct since then. Diomedea was formed after a split with Group TAC. Their animation they still work, Hana Kappa, we're taken over by OLM, Inc. and XEBEC.
- Nine the Original
- Nine 2: Sweetheart Declaration
- Nine 3: Final
- Nanami-chan 2nd Series
- Shinigami no Ballad
- Hanbun no Tsuki ga Noboru Sora
- Black Blood Brothers
- Kage Kara Mamoru!
- Nanami-chan 3rd Series
- Hana Kappa (Final Works)
- "Anime Production Firm Group TAC Files for Bankruptcy". Anime News Network. September 3, 2010. Retrieved 2 November 2010.