There are various companies that provide computer security services, develop computer security software or resell software exploits.
List
Absolute Security ADF Solutions Aikido Security Altor Networks Anonymizer (company) Arctic Wolf Networks ARX (company) AuthenTec Barracuda Networks Bitdefender BlueTalon Bromium Bugcrowd Canon IT Solutions Cato Networks Check Point Checkmarx Chronicle Security Clavister Columbitech Comodo Cybersecurity Core Security Technologies Credant Technologies Critical Start CronLab Crossbeam Systems CrowdStrike Cryptek CyberArk Cybereason CyberHound CyberTrust Cylance Cynet (company) Cyveillance DarkTrace Dasient Datto (company) Deep Instinct Druva Emsisoft ESafe ESET Exabeam F5, Inc. Fastly Finjan Holdings Fluid Attacks Forcepoint Forter Fortinet G Data CyberDefense Gen Digital General Dynamics Mission Systems Guardian Analytics HackerOne HBGary ImmuniWeb Impermium Imprivata InfoSec Institute Infysec IID (company) InterWorking Labs IOActive Itochu Techno-Solutions JAL Infotec Kaspersky Lab Lastline Librem Loggly LogLogic LogRhythm Mile2 Mitsui Knowledge Industry Mocana NEC Netcraft NetScreen Technologies Netwitness Nexor NitroSecurity Nomura Research Institute NowSecure NS Solutions OneLogin OneSpan OpenText Optenet Optiv Palo Alto Networks Penta Security Pine64 Ping Identity PrivateCore Prolexic Technologies Quick Heal Quantum eMotion Rapid7 RiskIQ RSA Security SCSK Secunet Security Networks Secureworks Sendio SentinelOne Skyhigh Security Snyk SonicWall Sony Global Solutions Sophos Splunk SQ1 Security Stonesoft Corporation Sumo Logic Synack Synopsys Tanium Tenable, Inc. ThreatConnect TitanFile Tiversa Trend Micro Trusteer Tufin Uniadex Vectra AI Venafi VMware Carbon Black WatchGuard Web Sheriff World Informatix Cyber Security Xetron YesWeHack Zerodium Zscaler