Top 10 Antivirus Software Companies (November 2026)

Pasadena, California, United States

RealDefense is a Pasadena-based consumer privacy and security platform that monetizes partner user bases through a suite of licensed technology products, including its SmartScan telemetry stack, VPN, identity protection, and optimization tools. The company was founded in 2003 by Gary Gusenev under the name Cyber Defender, grew to approximately $70 million in revenue by 2009 as a Nasdaq-listed public company, and was reacquired by Gusenev in 2017 for under $10 million, or less than 1x its then-annual recurring revenue of roughly $7 million. Since the 2017 buyback, RealDefense has executed six acquisitions, funded primarily through venture debt rather than equity dilution. The company secured a $30 million credit facility from Sunflower Bank in 2022, at a time when its EBITDA exceeded $10 million. By year-end 2025, RealDefense was on track to generate between $60 million and $70 million in top-line revenue with EBITDA of $20 million to $25 million, supported by a team of approximately 300 people and a revenue-per-employee ratio of roughly $230,000. Gusenev holds less than 20 percent equity in the current entity, a structure he describes as intentional and operator-driven. The company is targeting acquisitions of $100 million or more from a self-described multi-billion-dollar M&A pipeline, with a stated focus on consumer privacy and security businesses that can be integrated into RealDefense's shared billing, marketing, and AI infrastructure.

Lüneburg, NI, Germany

SaaS, Unified Security, UTM, Mobile Security, Network Security, Cyber Security, Antivirus, Archiving, Mobile app

Broomfield, Colorado, United States

Webroot, an OpenText company, was the first to harness the cloud and artificial intelligence to stop zero-day threats in real time. We provide endpoint protection, network protection, and security awareness training solutions purpose built for managed service providers and small businesses. Webroot BrightCloud® Threat Intelligence Services are used by market leading companies like Cisco, F5 Networks, Citrix, Aruba, A10 Networks, and more. Leveraging the power of machine learning to protect millions of businesses and individuals, Webroot secures the connected world. In 2019, Webroot and its parent company Carbonite were acquired by OpenText, a global leader in Enterprise Information Management. Together, we are a market leader in cyber resilience, offering total endpoint protection and disaster recovery for any sized business. Discover endpoint security and disaster recovery solutions at webroot.com. In 2019, Webroot was acquired by Carbonite, an endpoint and server backup and recovery provider serving customers ranging from small businesses to enterprises. Together, we are a leading cybersecurity and data protection company.

Santa Clara, California, United States

Malwarebytes is a cybersecurity company that provides software solutions to protect against malware, viruses, and other online threats. The company's flagship product is Malwarebytes Anti-Malware, which uses advanced technology to detect and remove malicious software from computers and mobile devices. Malwarebytes also offers a range of other cybersecurity products and services, including endpoint protection, threat intelligence, and incident response. The company was founded in 2008 and is headquartered in Santa Clara, California.

Mumbai, Maharashtra, India

Developer of enterprise security software designed to provide protection against cyber threats. The company's enterprise security software includes anti-virus, anti-spyware, content security, anti-spam and network intrusion prevention software, enabling enterprises to get protection against current and evolving cyber threats and protect all their information security assets.

Denver, Colorado, United States

Developer of a cyber security system. The company offers cybersecurity software systems that offer automatic security updates, anti-virus protection, content filtering and inspection, behavioral anomaly detection, algorithmic traffic fencing and secure website redirection.

Boca Raton, Florida, United States

iS3 develops products for consumers and businesses that ensure internet security, optimized computers, and provide personalized technical support. The company is dedicated to protecting our customers from malicious software and viruses. Our suite of products and our partnerships offer our customers an end to end security solution, and a technical support experience that is unique in the industry.

Pune, Maharashtra, India

Computer Repair and tech support. Security and Protection for Computers, Smartphones and Tablet

Leeds, Alabama, United States

Operator of cyber security firm intended to help businesses with all of their network and security needs.. The company's cyber security products includes antiviruses, data backup services, email security, firewalls, intrusion prevention detection systems, malware detection, network security appliances, product installations, web security, zero day attack/breach response and others, enabling companies to protect themselves against cyber security attacks.

Bordeaux, France

Altospam is a company that provides antispam, antivirus, and anti-phishing software solutions. They offer email protection services to protect against cyberattacks and ensure the security of emails.