Utilize the input text as a context reference, choose the right relationship between 'Glencore' and 'Ivan Glasenberg' from the options.
Options: platform, industry, owned by, chairperson

LONDON—Collapsing commodity prices have forced one of the mining world’s most aggressive chief executives into retreat, pushing Glencore PLC’s Ivan Glasenberg on Monday to scrap the company’s dividend, issue more stock and sell assets.
owned by