ThreatLocker

ThreatLocker was founded in 2017 by Danny Jenkins, Sami Jenkins, and John Carolan. According to the company's own account, Danny Jenkins witnessed a severe phishing attack that nearly devastated a business, exposing gaps in reactive cybersecurity approaches, which motivated him to build a proactive, 'default deny' Zero Trust alternative to traditional 'default allow' security models. The company launched with an application allowlisting product and has since expanded into a broader Zero Trust platform.

The platform provides enterprise cybersecurity tools for endpoints, networks, and (as of 2026) cloud systems, including application allowlisting, ringfencing, network access control, storage control, elevation control, and threat detection. ThreatLocker is based in Orlando, Florida, with a European headquarters in Blanchardstown, Dublin (opened in 2023), and additional offices in the United Arab Emirates and Australia. As of 2025 the company employed roughly 600 people in Florida and about 100 more elsewhere, and served approximately 50,000 companies. Its competitors include SentinelOne, CrowdStrike, Symantec Endpoint Protection, and Microsoft Defender for Endpoint.

ThreatLocker expanded into Europe in 2021 and, by 2022, had raised a cumulative $100 million; it acquired Third Wall (a Windows security plug-in maker) in 2022 and the assets of HyperQube Technologies in 2023. A Series D round raised $115 million in 2024. In 2026 the company added zero trust network and cloud access products and stood up 14 data centers, and on July 29, 2026 it announced a $190 million Series F funding round led by existing investor Elephant, with participation from D. E. Shaw Ventures, Arthur Ventures, and new investor Koch Disruptive Technologies -- a round CRN reported came after a prior valuation of $1.6 billion. CEO Danny Jenkins said in 2025 the company was planning an eventual initial public offering within two to three years.