The security of a company that has only one business line or product, and its value solely depends on the single product or service. An example of pure play securities are the issues of R&D companies (such as a small biotechnology firm that is developing specific types of therapies). Analysts usually select the company or companies that have a single line of business or product helps estimating the market risk of a similar project under consideration.

Pure play may also refer to the company itself (i.e., the company which has a single line of business).