Taisei Corporation
Livedoor has its headquarters in the . H.I.S. has its headquarters in the Shinjuku Oak Tower. Seiko Epson's Tokyo Office is in the Shinjuku NS Building. Capcom's Tokyo offices are located in the Shinjuku Mitsui Building and Keihin Corporation is headquartered in the Shinjuku Nomura Building. Taisei Corporation also has its headquarters in the district.