Utilize the input text as a context reference, choose the right relationship between Bolloré and Vivendi from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

PARIS—French billionaire and Vivendi SA chairman Vincent Bolloré ousted the longtime chief of Canal Plus on Thursday, further tightening his grip over the Vivendi-owned pay-TV group amid falling subscriber numbers.

Answer: owner_of