As of 2015, Theranos has not filed shares of the company stock to the public, reports Bloomberg. On Sept. 29, 2015, the company's founder Elizabeth Holmes shared that the company plans to remain private.
Investors can periodically check the Nasdaq IPO filing page to see if the company has filed the necessary paperwork to go public, according to the Nasdaq website. Once the company files, Nasdaq lists the stock symbol the company uses for consumers to check. The site also shows how many shares are available for purchase and the expected stock price range for the acquisition of the company stock.