What is the relationship between Jamie Dimon and Chief Executive Officer 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.

NEW YORK, Sept 18 (Reuters) - JPMorgan Chase & Co's third-quarter markets revenue is running "about the same as everybody else," Chief Executive Officer Jamie Dimon said on Friday after two major competitors had said their revenues were down about 5 percent from a year earlier.

Answer: position_held