Lookout Mobile Security, a provider of antivirus software for mobile devices, has raised $19.5 million in funding from a group of investors led by Index Ventures.

The round also included existing investors Accel Partners and Khosla Ventures. Lookout, which has raised a total of $36 million, has yet to turn a profit.

The company, whose products protect Google Inc's Android phones, Research in Motion's BlackBerry and Microsoft Corp's Windows Phone, launched its services in September 2009.

It competes with Symantec Corp and other security software makers.

(Reporting by Jim Finkle; Editing by Lisa Von Ahn)

Software Security