Yagiri Pharmaceuticals is a Japanese company based in Ikebukuro and owned and operated by the Yagiri family. Namie Yagiri entered the company near the bottom and worked her way up to her position as Chief, running the company until it was bought out by an American competitor, Nebula. While she was Chief, Namie used the company as a means to hide Celty's head. During that time, Namie also had her underlings within the company kidnap people, often undocumented immigrants, in order to perform experiments on them.
Namie's subordinates within Yagiri Pharma were responsible for bringing Mika Harima in after Seiji found her in his apartment and knocked her unconscious. In the anime, they also brought in a young man who threw firecrackers at the company headquarters in apparent protest of their activities. Namie's direct subordinates were in contact with Shinra Kishitani, who was at times brought in to complete surgery on their victims, including Mika and the young man with firecrackers. Shinra was aware of the company's human experimentation and the fact that they had possession of Celty's head until they were bought out by Nebula.