Zscaler Acquires Browser Security Firm SquareX 

Zscaler (NASDAQ: ZS) on Thursday announced that it has acquired browser security firm SquareX for an undisclosed sum.

SquareX offers what it has dubbed a “Browser Detection and Response (BDR)” solution that converts any web browser into an enterprise-grade secure browser, providing the same functionality as dedicated enterprise browsers without cumbersome change management.

SquareX claims that its browser extension effectively manages threats like malicious extensions, phishing, genAI data leakage, insider threats, and more, directly within the browser environment, reducing the enterprise attack surface without compromising user experience.

With the technology provided by SquareX, Zscaler says it will be able to extend security to unmanaged devices, enabling organizations to secure users within their preferred browser – such as Google Chrome and Microsoft Edge – without the need for a full agent or the limitations of a separate, third-party browser. 

“Enterprises have historically relied on legacy VPNs and VDIs, but these technologies are fundamentally flawed and laden with security risks,” said Jay Chaudhry, CEO, Chairman, and Founder of Zscaler. “With SquareX, Zscaler is deepening our Zero Trust Exchange^TM Platform’s capabilities in standard browsers, such as Google Chrome or Microsoft Edge, to stop threats without having to deploy a third-party enterprise browser.”

“By integrating with Zscaler, we will enable organizations to secure SaaS and private applications across any device – managed or BYOD – without compromising productivity,” said Vivek Ramachandran, founder of SquareX. “This approach allows IT leaders to replace expensive, insecure legacy access tools with precise Zero Trust policies that protect data and AI interactions based on an organization’s specific risk profile.” 

SquareX raised $20 million in a Series A funding round led by SYN Ventures in April 2025.

Zscaler’s acquisition of SquareX closed on February 5, 2026, adding to several other recent acquisitions.

In November 2025, Zscaler announced plans to acquire AI security company SPLX, and in recent years acquired Red Canary for $675 million, Avalor for $350 million, and AirGap Networks for an undisclosed sum.