Definitions of subscriber
a person that pays to receive a service such as a utility service (eg gas, water, internet) or a publication (eg a magazine or a newspaper)
Subscribers to the broadband service were informed of the pending rate increase.
a shareholder, especially one who has bought (or will buy) newly issued shares in a company
Pursuant to the initial public offering, 1,000,000 new shares in the company were issued to subscribers.
in the UK, the first shareholder(s) of a company on its incorporation
The company's subscribers expected a return on their investment after the first five years.