Utilize the input text as a context reference, choose the right relationship between Xstrata and Glencore 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.

Mining and trading company Glencore Plc (Xetra: A1JAGV - news ) , former Xstrata Chief Executive Officer Mick Davis' X2, and British investment firm Audley Capital (Other OTC: CGHC - news ) were among the first round of bidders, sources told Reuters in June.

Answer: owned_by