What is the relationship between Sinopec and Beijing 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.

These include Chinese search giant Baidu, financial services firm HSBC, instant noodle maker Tingyi, Beijing Airport and energy logistics firm Sinopec Kanton, whose share prices halved in the past week.

Answer: headquarters_location