Take context from the input text and decide on the accurate relationship between 'Ivan Glasenberg' and 'Glencore' from the options provided.
Options: owner of, parent organization, chief executive officer, 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