> Enrich.chat gives AI agents verified work emails and mobiles. To use it from an agent, read https://enrich.chat/agents.md . This is the Markdown version of https://enrich.chat/companies-in/san-jose-ca/computer-and-network-security/ # Cybersecurity Companies in San Jose, CA The bigger cybersecurity companies headquartered in San Jose, CA, with what they do, their sizes and how to reach their people. By Enrich.chat Editorial. Updated October 22, 2026. **Short answer:** Among the cybersecurity companies counted in San Jose, CA, the biggest by headcount range include Zscaler, Mcafee and Forescout Technologies. They are mostly very small: 63% have 50 or fewer employees. ## Which cybersecurity companies are in San Jose? Among the companies whose public profile lists Computer and Network Security as their industry and San Jose, CA as their headquarters, the biggest by headcount range include Zscaler, Mcafee, Forescout Technologies, Vectra Ai and Noname Security. Names link to a company profile where we have one. | Company | Employees | | --- | --- | | Zscaler | 5,001 to 10,000 | | Mcafee | 1,001 to 5,000 | | Forescout Technologies | 1,001 to 5,000 | | Vectra Ai | 501 to 1,000 | | Noname Security | 201 to 500 | | Somansa Dlp | 201 to 500 | | Stellar Cyber | 51 to 200 | | Cyberarrow | 51 to 200 | | Balbix | 51 to 200 | | Axiado | 51 to 200 | | Virsec | 51 to 200 | | Elisity | 51 to 200 | | Axiad | 51 to 200 | | Exaforce | 51 to 200 | | Secqureone | 51 to 200 | | Cloud Harmonics, An Ingram Micro | 51 to 200 | | Genians | 51 to 200 | | Anchain.Ai | 11 to 50 | | Theom | 11 to 50 | | Precize | 11 to 50 | | Avocado Systems | 11 to 50 | | Lumeus.Ai | 11 to 50 | | Quokka.Io | 11 to 50 | | Bravo Consulting | 11 to 50 | | Pre Security | 11 to 50 | The table shows the 25 biggest by headcount range, with ties broken by audience size. The charts and percentages below cover every company counted for this page, not just these 25, and companies with fewer than 11 employees are not counted. Headquarters is the location on each company's public profile. ## What do cybersecurity companies in San Jose do? Computer and Network Security is a broad label. The most common NAICS codes among them are 541511 (33%), 513210 (25%) and 541512 (17%). **Figure: What cybersecurity companies in San Jose do.** Bars for the share of counted cybersecurity companies with each code: 541511 33%, 513210 25%, 541512 17%, 334118 8%, 541618 8%, 561621 8%. *Share of counted cybersecurity companies in San Jose by their NAICS code.* [NAICS 541511](https://enrich.chat/naics/541511/)[NAICS 513210](https://enrich.chat/naics/513210/)[NAICS 541512](https://enrich.chat/naics/541512/)[NAICS 561621](https://enrich.chat/naics/561621/) ## How big are they? 63% of the cybersecurity companies counted in San Jose have 50 or fewer employees, and the middle one is in the 11 to 50 range. Companies with fewer than 11 employees are not counted. **Figure: Size of cybersecurity companies in San Jose.** Seven columns for the share of counted cybersecurity companies in San Jose in each employee range: 11 to 50 63%, 51 to 200 24%, 201 to 500 4%, 501 to 1,000 2%, 1,001 to 5,000 4%, 5,001 to 10,000 2%, 10,001+ 0%. *Share of counted cybersecurity companies in San Jose in each employee range.* ## How cybersecurity companies compare - 63% of cybersecurity companies in San Jose have 50 or fewer employees, against 71% across other cities on this site. ## How do you reach the people at cybersecurity companies in San Jose? The people to talk to are usually security, engineering and revenue leaders. Build the list in three prompts to your AI agent. ### 1. Count them (free) Counting who matches never uses credits. ```text Use www.enrich.chat to count the cybersecurity companies in San Jose, CA ``` ### 2. Find the people (5 credits per person) Name the roles you sell to. Each person returned is 5 credits, and name, title and company are included. ```text Use www.enrich.chat to find the security, engineering and revenue leaders at cybersecurity companies in San Jose, CA, with their titles ``` ### 3. Get their work emails (10 credits each) An email is 10 credits only when one is found. Every email comes with a status: verified, catch-all or unknown. ```text Use www.enrich.chat to find the work emails for these people and tell me which ones are verified ``` ## More to explore Other industries in San Jose: [Software Companies](https://enrich.chat/companies-in/san-jose-ca/software-development/)[Construction Companies](https://enrich.chat/companies-in/san-jose-ca/construction/)[IT Services Companies](https://enrich.chat/companies-in/san-jose-ca/it-services-and-it-consulting/)[Technology and Internet Companies](https://enrich.chat/companies-in/san-jose-ca/technology-information-and-internet/)[Real Estate Companies](https://enrich.chat/companies-in/san-jose-ca/real-estate/)[Advertising Agencies](https://enrich.chat/companies-in/san-jose-ca/advertising-services/)[Semiconductor Companies](https://enrich.chat/companies-in/san-jose-ca/semiconductor-manufacturing/)[Electrical and Electronics Manufacturers](https://enrich.chat/companies-in/san-jose-ca/appliances-electrical-and-electronics-manufacturing/)[Financial Services Companies](https://enrich.chat/companies-in/san-jose-ca/financial-services/)[Nonprofit Organizations](https://enrich.chat/companies-in/san-jose-ca/non-profit-organizations/)[Hospitals and Health Care Organizations](https://enrich.chat/companies-in/san-jose-ca/hospitals-and-health-care/)[Facilities Services Companies](https://enrich.chat/companies-in/san-jose-ca/facilities-services/)[Staffing and Recruiting Firms](https://enrich.chat/companies-in/san-jose-ca/staffing-and-recruiting/)[Telecommunications Companies](https://enrich.chat/companies-in/san-jose-ca/telecommunications/)[Consulting Firms](https://enrich.chat/companies-in/san-jose-ca/business-consulting-and-services/)[Medical Device Companies](https://enrich.chat/companies-in/san-jose-ca/medical-equipment-manufacturing/)[All of San Jose](https://enrich.chat/companies-in/san-jose-ca/) Cybersecurity Companies in other cities: [San Francisco, CA](https://enrich.chat/companies-in/san-francisco-ca/computer-and-network-security/) ## Frequently asked questions ### Which are the biggest cybersecurity companies in San Jose? Among those counted, they include Zscaler, Mcafee, Forescout Technologies, Vectra Ai and Noname Security, ranked by headcount range. ### How big are cybersecurity companies in San Jose? 63% of those counted have 50 or fewer employees, and the middle one is in the 11 to 50 range. Companies with fewer than 11 employees are not counted. ### Which companies count as computer and network security? Companies whose public profile lists Computer and Network Security as their industry and whose headquarters are in San Jose, CA. ## Try this prompt Find the people at cybersecurity companies in San Jose ```text Use www.enrich.chat to find the security, engineering and revenue leaders at cybersecurity companies in San Jose, CA, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [Software Companies in San Jose](https://enrich.chat/companies-in/san-jose-ca/software-development/) - [Construction Companies in San Jose](https://enrich.chat/companies-in/san-jose-ca/construction/) - [IT Services Companies in San Jose](https://enrich.chat/companies-in/san-jose-ca/it-services-and-it-consulting/) - [Technology and Internet Companies in San Jose](https://enrich.chat/companies-in/san-jose-ca/technology-information-and-internet/) - [Cybersecurity Companies in San Francisco](https://enrich.chat/companies-in/san-francisco-ca/computer-and-network-security/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)