Utilize the input text as a context reference, choose the right relationship between Singapore exchange and Singapore 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.

Two weeks before reporting earnings, companies listed in Singapore aren’t allowed to repurchase their shares , according to Singapore exchange rules, the Business Times reported Thursday.

Answer: headquarters_location