What does SquareX sell?

SquareX sells Browser Detection and Response (BDR), SquareX Browser Extension (Enterprise Browser) and Browser DLP. Browser Detection and Response (BDR): Detects, mitigates and threat-hunts client-side web attacks against employees in real time. SquareX Browser Extension (Enterprise Browser): Installs as an extension that turns any browser on any device into an enterprise-grade secure browser. Browser DLP: Applies data loss prevention controls inside the browser to secure any browser on any device.

Who does SquareX fit?

From its own pages, SquareX sells mainly to organizations that want to detect, mitigate and threat-hunt client-side attacks. SquareX describes access for contractors and BYOD users through a containerized browser session. SquareX describes developer environments built from containerized desktops tailored to each developer or team. SquareX access controls work across managed, unmanaged and BYOD devices.

How does CISO Tribune file SquareX?

CISO Tribune files SquareX under Browser protection extensions, with Data loss prevention as a secondary category.

SquareX is owned by Zscaler, which acquired it in 2026.

Company record · security vendor

SquareX

Where SquareX appears on the record (32)

Every page on CISO Tribune and its network that carries this company, 32 in all.

Compared with (30): vs Barracuda Networks, vs BigID, vs Broadcom, vs Code42, vs Concentric AI, vs Cyberhaven, vs Cyera, vs Daylight, vs DTEX Systems, vs Egress, vs F-Secure, vs Fasoo, vs Forcepoint, vs Harmonic Security, vs Hilt, vs Island, vs Jazz, vs Keep Aware, vs McAfee, vs Menlo Security, vs Netskope, vs Next DLP, vs Polymer, vs Seraphic Security, vs Singulr, vs Skyhigh Security, vs Spin.AI, vs Sublime Security, vs Teramind, vs Trustifi
In the vendor directory (2): Browser protection extensions vendors · primary category
Data loss prevention vendors · category

What the company sells

SquareX sells a Browser Detection and Response (BDR) solution that organizations use to detect, mitigate and threat-hunt client-side attacks. SquareX runs entirely in the browser. SquareX works with major browsers including Chrome, Edge, FireFox and Safari. SquareX does not require enterprises to use a custom browser.

SquareX focuses on securing the browser against modern threats. SquareX describes the browser as the place where nearly all work and a vast majority of cyberattacks occur today. SquareX's built-in Browser Detection and Response (BDR) capabilities detect and mitigate web-based threats such as phishing, malicious file downloads and browser-based malware in real time. SquareX has discovered and disclosed multiple zero days. SquareX researches and predicts the evolution of attacks, drawing on experience in offensive security. SquareX holds that security should not come at the cost of user experience and productivity.

SquareX planned the launch of its enterprise product for the RSA Conference 2024 in San Francisco.

SquareX's browser-based model does not require client software or virtual desktop agents to be installed on user devices. SquareX enables secure access within the user's native browser session, so users do not shift between virtual and local desktops. SquareX allows administrators to define access policies for the entire virtual environment and for each web application and internal resource. Per-application policy management limits users to accessing only what they need. SquareX access controls are device-agnostic and work across managed, unmanaged and BYOD devices. SquareX's browser-based access gives contractors and BYOD users a containerized browser session that operates independently of the local device environment.

SquareX enables developer-specific environments, packaging thick clients through containerized desktops tailored to the workflows of each developer or team. In containerized developer desktops, developers can use IDEs like VS Code, command-line tools, database servers and other development utilities directly in their browsers.^{[1][2][4][5][6][7][8][9]}

Categories: Browser protection extensions (primary category)
Data loss prevention
Compare SquareX with companies in the same category
Headquarters: Not established from our sources
Founded: Not established from our sources
Ownership: Owned by Zscaler since 2026^[3][10]
CISO on record: Not yet on our record. Send a verified source
Website: sqrx.com

Products and services

Product names as the company writes them; what each does, in our words, from the company's own product pages. Never how well it does it.

Browser Detection and Response (BDR)^[2][7][9]
Detects, mitigates and threat-hunts client-side web attacks against employees in real time.
SquareX Browser Extension (Enterprise Browser)
Installs as an extension that turns any browser on any device into an enterprise-grade secure browser.
Browser DLP^[2]
Applies data loss prevention controls inside the browser to secure any browser on any device.

Competitors and alternatives

The other companies on our record filed under the same categories, category by category: first those that lead with that category and share more of SquareX's categories, then alphabetical. A list from the record, never a ranking.

On browser protection extensions, SquareX competes with Keep Aware, Seraphic Security and Spin.AI.
On data loss prevention, SquareX competes with Cyberhaven, Fasoo, Forcepoint, Hilt, Jazz, Next DLP, Keep Aware, Spin.AI, Barracuda Networks, BigID and 19 more.

References

Every fact above cites one of these by number. Tier A is the company itself, a regulator or a filing; tier B is trade or business press.

[1]Squarex discloses architectural limitations of browser devtools in debugging malicious extensions 302518583SquareX via PR Newswire · prnewswire.com · published July 31, 2025 · Tier A: the company, a regulator or a filing
[2]sqrx.comSquareX · sqrx.com · undated page, accessed September 27, 2026 · Tier A: the company, a regulator or a filing
[3]Zscaler acquires squarexZscaler · zscaler.com · published February 5, 2026 · Tier A: the company, a regulator or a filing
[4]Showcasing our Industry-First BDR Solution in Singapore | by SquareX | SquareX LabsSquareX Labs · published October 23, 2024 · Tier A: the company, a regulator or a filing
[5]An Evening of Browser Security: SquareX’s RSAC Networking Dinner | by SquareX | SquareX LabsSquareX Labs · published May 7, 2025 · Tier A: the company, a regulator or a filing
[6]SquareX | Browser Detection and Response (BDR) SolutionSquareX · undated page, accessed October 28, 2026 · Tier A: the company, a regulator or a filing
[7]SquareX: Pioneering Browser Detection and Response (BDR)SquareX · undated page, accessed November 10, 2026 · Tier A: the company, a regulator or a filing
[8]SquareX Receives the Technology Excellence Award by SBR in Cybersecurity, Internet and New Media Category | by SquareX | SquareX LabsSquareX Labs · undated page, accessed November 10, 2026 · Tier A: the company, a regulator or a filing
[9]6 Reasons Why Enterprises Are Shifting from VDI to SquareX | by Engineering @ SquareX | SquareX LabsSquareX Labs · undated page, accessed November 10, 2026 · Tier A: the company, a regulator or a filing
[10]Zscaler extends zero-trust security to browsers with SquareX acquisition | CSO OnlineCSO Online · published February 6, 2026 · Tier B: trade or business press

Last verified November 2, 2026. Our code found the quoted passage behind each fact on its source page when the fact was recorded, and re-checks every record against its sources each month.

Recorded September 27, 2026, expanded November 10, 2026 from the references above.

Work for SquareX? Suggest a correction to a fact on this page (with a source on your own domain), or claim this entry by publishing a small file on your domain.

Security leadership

CISO Tribune has not yet recorded who holds the top security seat at SquareX. We add a seat only from a verified source; if you have one, send it to the desk.

Questions CISOs ask about SquareX

What does SquareX sell?: SquareX sells Browser Detection and Response (BDR), SquareX Browser Extension (Enterprise Browser) and Browser DLP. Browser Detection and Response (BDR): Detects, mitigates and threat-hunts client-side web attacks against employees in real time. SquareX Browser Extension (Enterprise Browser): Installs as an extension that turns any browser on any device into an enterprise-grade secure browser. Browser DLP: Applies data loss prevention controls inside the browser to secure any browser on any device.
Who does SquareX fit?: From its own pages, SquareX sells mainly to organizations that want to detect, mitigate and threat-hunt client-side attacks. SquareX describes access for contractors and BYOD users through a containerized browser session. SquareX describes developer environments built from containerized desktops tailored to each developer or team. SquareX access controls work across managed, unmanaged and BYOD devices.
How does CISO Tribune file SquareX?: CISO Tribune files SquareX under Browser protection extensions, with Data loss prevention as a secondary category.
Who owns SquareX?: SquareX is owned by Zscaler, which acquired it in 2026.

Related guides

CISO Reporting Structure, the Five Models and What the Filings Show
Most security chiefs report into technology leadership (64%), the rest to business leaders. The five models, their trade-offs and what 10-K filings show.
CISO News: Tracking Every Appointment and Departure in the Top Security Seat
CISO Tribune records every CISO appointment and departure as a sourced, dated entry, not a column: 466 moves to date, each with a primary source and a confirmed-or-reported label.
CISO, CSO, VP of Security, Head of Security: What the Titles Mean and What the Record Shows
A chief information security officer (CISO) owns information security. A chief security officer (CSO) usually adds physical security and investigations.