Zscaler, Inc. (/ˈziːˌskeɪlər/) is an American cloud security company based in San Jose, California.

[6] The company's second funding round, led by TPG Capital, raised $100 million in August 2015.

[15] It is built on the company's AI-powered SSE platform to securely connect users, locations, and cloud services through its Zero Trust Exchange.

[17] Zscaler acquired the AI and machine-learning technology of TrustPath in August 2018; the browser security company Appsulate for $13 million in May 2019; cloud security posture management startup Cloudneeti in April 2020; and microsegmentation firm Edgewise Networks in May 2020.

[22] In March 2024, the company acquired Israel-based data security startup Avalor, which uses AI to analyze data in search of identifying security vulnerabilities, for $310 million;[23] and network segmentation startup Airgap Network, for an undisclosed amount.