F-Secure Corporation (formerly Data Fellows) is an anti-virus and computer security software company based in Helsinki, Finland. The company has branch offices in the USA and Japan, where antivirus analysis and software development work is ongoing. F-Secure Corp. is publicly traded on the Helsinki Stock Exchange under the symbol FSC1V. F-Secure claims that it was the first antivirus vendor to establish a presence on the World Wide Web. The F-Secure Labs weblog tracks global internet and mobile security threats.