Horizon3 Promotes Ellen Sundra to Chief Customer Officer Role

Horizon3 announced on October 14, 2026, that it has promoted Ellen Sundra to the position of Chief Customer Officer. This executive appointment expands her responsibilities across multiple customer-facing departments to strengthen the company’s focus on security outcomes and platform adoption.

Sundra previously served as Vice President of Customers. In her new role, she will lead Sales Engineering, Customer Success, Support, Enablement, Renewals, and Field Chief Technology Officers. This consolidation places six distinct functions under single leadership to help clients derive value from the NodeZero platform more quickly.

Strategic Alignment and Leadership

Snehal Antani, CEO and co-founder of Horizon3, stated that Sundra embodies the company's customer-obsessed values. Antani noted that Sundra’s technical expertise has been instrumental in cultivating strong customer advocacy. He added that she helped build the processes necessary to scale support for the more than 7,000 companies relying on Horizon3 for cyber resilience.

Sundra joined Horizon3 in December 2024, bringing decades of experience in technical and customer leadership. Before her current role, she spent nearly 15 years at Forescout, where she advanced from Federal Systems Engineer to Chief Customer Officer. Her career combines deep cybersecurity knowledge with experience building teams that serve practitioners and executives.

Operational Focus and Growth

The promotion reflects Horizon3’s strategy to make customer success central to its growth. By connecting the guidance organizations receive during evaluation with the support they need during usage, the company aims to improve retention and expansion metrics. Sundra said her focus is on helping teams become confident users of NodeZero, turning findings into verified fixes to reduce risk over time.

As Threat Times reported on October 16, 2026, Horizon3 also elevated Keith Poyser to EMEA General Manager following significant revenue growth in that region. These simultaneous appointments highlight the company’s broader efforts to scale its leadership structure globally while maintaining a focus on measurable security results for its client base.

What should you do?

Organizations using NodeZero should review their current engagement with Horizon3’s support and engineering teams to ensure they are leveraging the full scope of Sundra’s new consolidated leadership. Security leaders may find opportunities to align their remediation workflows more closely with the platform’s proactive testing capabilities.

What to do and how to stay safe: Horizon3

• Contact your Horizon3 account team to discuss how the new CCO structure may affect your support and enablement resources.
• Review your current NodeZero usage patterns to identify gaps between initial deployment and ongoing remediation verification.
• Schedule a review with your Field CTO to align technical guidance with your organization’s evolving security priorities.
• Monitor Horizon3 communications for updates on expanded customer success initiatives and training opportunities.

Step-by-step guide: Mobile Device Security: How to Protect Data Beyond Passwords

General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.

Frequently asked questions

Who is Ellen Sundra and what is her new role?

Ellen Sundra is the new Chief Customer Officer at Horizon3, a position she was promoted to on October 14, 2026, from Vice President of Customers.

Which departments does Sundra oversee?

She oversees Sales Engineering, Customer Success, Support, Enablement, Renewals, and Field CTOs, consolidating six customer-facing functions.

What is Horizon3's NodeZero platform?

NodeZero is an AI-native proactive security platform that autonomously tests defenses, uncovers exploitable attack paths, and verifies fixes to improve cyber resilience.