Utilize the input text as a context reference, choose the right relationship between Citigroup and financial services from the options. Options: 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.

About half the recruits for senior-level openings at mid-size banks are people whose resumes lead with names including Citigroup Inc. and JPMorgan Chase & Co., estimates Robert Voth, managing director in the financial services group at Russell Reynolds Associates, a recruiting firm.

Answer: industry