Utilize the input text as a context reference, choose the right relationship between Bill Gates and Microsoft 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.

The charity foundation of multi-billionaire Microsoft founder Bill Gates has sued Petrobras and accounting giant PwC's Brazil arm over investment losses due to corruption at the Brazilian oil giant.

Answer: owner_of