Iwao Aso

Aso Corp. offers medical services. The company provides medical due diligence surveying, medical consulting, and other services. It also operates construction consulting, environmental treatment, real estate development, and other businesses. The company was founded by Takichi Aso in 1872 and is headquartered in Iizuka, Japan.

GYOSEI Corp. is a holding company that publishes books and magazines. Its business includes printing and publishing of law reports, books, and magazines and support services such as data management. The firm also publishes materials such as public administration, education and the legal profession in digital format. The company was founded in September 1893 and is headquartered in Tokyo, Japan.

IREP Co., Ltd. engages in the digital marketing business. Its services include paid listing, search engine marketing (SEM), mobile SEM, web analytics, and internet advertising. The company was founded by Masayuki Takayama in November 1997 and is headquartered in Tokyo, Japan.

D.A. Consortium Holdings, Inc. operates as a holding company that engages in the management of its subsidiaries operating online advertising and related businesses. It operates through the following business segments: Internet-related and Investment. The Internet-related segment handles the Internet advertising business and solutions business supporting in enterprise marketing. The Investment segment covers venture capital investments. The company was founded on October 3, 2016 and is headquartered in Tokyo, Japan.