Utilize the input text as a context reference, choose the right relationship between Marshall Wace and hedge fund 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.

Sept 9 (Reuters) - Private equity firm KKR & Co LP said it would acquire a 24.9 percent stake in London-based hedge fund Marshall Wace LLP.

Answer: industry