Health-care IT security company Imprivata Inc. said Wednesday that it has agreed to be acquired by private-equity firm Thoma Bravo LLC for $19.25 a share, or about $544 million.

The price represents a 33% premium over Imprivata's Tuesday stock price of $14.50. Shares rose 33% to $19.25 in premarket trading.

The company, which helps health-care providers protect patient information comply with regulations, made its debut on public markets in June 2014 at a price of $15.

In 2015, the company posted $119.1 million in revenue and a net loss of $23.1 million.

Thoma Bravo typically invests in application and infrastructure software and technology-enabled services.

Write to Austen Hufford at austen.hufford@wsj.com

(END) Dow Jones Newswires

July 13, 2016 09:35 ET (13:35 GMT)

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