Refer to the input text as context and select the correct relationship between 'Ivan Glasenberg' and 'Glencore' from the available options.
Options: owned by, owner of, parent organization, chief executive officer

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.
owner of