Utilize the input text as a context reference, choose the right relationship between Comcast and Nasdaq 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.

Nasdaq volume was higher than on Wednesday, but NYSE volume was slightly ... 07/16/2015 05:05 PM ET Comcast Worry?

Answer: stock_exchange