Utilize the input text as a context reference, choose the right relationship between stock market and Stock Exchange 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.

"It's not objective or rational to say that HOMS was the major force of the stock market turmoil," Hundsun in a filing to the Shanghai Stock Exchange today.

Answer: operator