What is the relationship between Covestro and Bayer in the context of the input sentence. Choose an answer from: 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.

Bayer AG’s Covestro plastics unit, which opened its 2.5 billion-euro IPO to investors on Monday, has yet to find demand for all the shares on offer, according to people familiar with the matter.

Answer: owned_by