Short answers, pulled from the story.
Pioneer Corporation founded the LaserDisc Corporation in March 1981 to produce LaserDisc players in Japan. The company began as a hardware manufacturer before pivoting to content distribution.
On the 21st of July 2003, Dentsu acquired the company and renamed it Geneon Entertainment Inc. Dentsu is a Japanese advertising and marketing firm that took control of operations.
Universal Pictures International Entertainment purchased 80.1% of the company on the 12th of November 2008. NBC Universal planned to merge this entity with its own Universal Pictures Japan division.
The company changed its name to NBCUniversal Entertainment Japan LLC on the 9th of December 2013. They established a partnership with Universal Sony Pictures Home Entertainment on the 17th of February 2013.
Headquarters remain located in Akasaka, Minato, Tokyo under Comcast ownership. The firm continues producing series like Golden Kamuy and Seraph of the End today.