Imprivata is an IT security company based in Lexington, Massachusetts. Founded in 2002, Imprivata develops and sells the OneSign Platform for securing employee access to desktops, networks and applications using a single sign-on.

In 2011, Imprivata had over 1,250 clients and several offices. Imprivata customers are primarily from the healthcare industries. Imprivata became a public company on June 25, 2014, and was listed on the New York Stock Exchange, until it was acquired by private equity investment firm Thoma Bravo, LLC in 2016.

Imprivata was founded by Phil Scarfo and David Ting, who had developed identity management technology while working at Polaroid Corporation’s small business incubator.

The company shipped its first product, the OneSign Enterprise Single Sign-On appliance, in 2004. In 2005, Imprivata expanded to Europe, Africa and the Middle East, and in 2006 Imprivata founder David Ting was selected by InfoWorld as one of the top 25 chief technology officers of the year.

In 2009, Imprivata acquired the assets of IdentiPHI, a manufacturer and reseller of biometric technology, including the SAFsolution product line, and in 2011, acquired assets of Validus Medical Systems of Santa Cruz, California, which was incorporated into the Imprivata Cortext technology.

In July, 2016, Imprivata announced that it agreed to be acquired by Thoma Bravo, a private equity firm based in San Francisco, for $19.25, estimated at a total of $544 million. Omar Hussain was chief executive at the time.

Imprivata OneSign helps companies manage user access and authentication. Product reviews suggest that the OneSign allows companies to enable all enterprise applications for single sign on without requiring custom scripting or modifications to existing directories. OneSign can also strengthen user authentication to desktops and networks by replacing passwords with a range of authentication options that include finger biometrics, proximity cards, smart cards, many national and government ID cards, One-Time-Password tokens, and an employee’s physical location. Product reviews also comment on OneSign's ability to simplify compliance reporting by consolidating the employee strong authentication and application access events in a single database.