What is the relationship between Marshall Wace and hedge fund in the context of the input sentence. Choose an answer from: 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