Analyze the relationship between 'Ivan Glasenberg' and 'Glencore' within the context of the input sentence.
Options: owner of, chief executive officer, parent organization, owned by

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