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

But Glencore chief executive Ivan Glasenberg said his company was "well positioned" to benefit when the commodities market rose again.

Answer: chief_executive_officer