Utilize the input text as a context reference, choose the right relationship between Worldpay and Advent International 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.

Owned by Advent International and Bain Capital, two buyout firms, since 2010, Worldpay will be propelled straight into the FTSE-100 if it proceeds with a flotation.

Answer: parent_organization