# Sequoia doubles down on Cymphony as AI agents create new enterprise security risks

> Cymphony, an enterprise security startup focused on the risks created by AI agents, has raised a $25 million Series A co-led by Sequoia and SMBC's Fin Atlas Beyond Fund, valuing the company at more than $100 million as it emerges from stealth with about $30 million in total funding. The pitch addresses a problem that barely existed a year ago: autonomous agents that can take actions inside corporate systems. As companies hand AI agents real permissions to send emails, move data, and execute tasks, they also open new attack surfaces. A compromised or manipulated agent can do damage at machine speed, and traditional security tools were not built to monitor software that acts on its own initiative. Cymphony is betting that securing agent behavior becomes its own category. Sequoia's involvement, described as doubling down, signals conviction that agentic AI is moving into production fast enough to make the security gap urgent. If enterprises deploy agents widely, the companies that keep them from going rogue could prove as essential as the agents themselves.

_Section: [AI Funding Tracker](https://www.wortins.com/funding) · Source: TechCrunch · Published Wednesday, September 9, 2026_

## Wortins' read

Cymphony, an enterprise security startup focused on the risks created by AI agents, has raised a $25 million Series A co-led by Sequoia and SMBC's Fin Atlas Beyond Fund, valuing the company at more than $100 million as it emerges from stealth with about $30 million in total funding. The pitch addresses a problem that barely existed a year ago: autonomous agents that can take actions inside corporate systems. As companies hand AI agents real permissions to send emails, move data, and execute tasks, they also open new attack surfaces. A compromised or manipulated agent can do damage at machine speed, and traditional security tools were not built to monitor software that acts on its own initiative. Cymphony is betting that securing agent behavior becomes its own category. Sequoia's involvement, described as doubling down, signals conviction that agentic AI is moving into production fast enough to make the security gap urgent. If enterprises deploy agents widely, the companies that keep them from going rogue could prove as essential as the agents themselves.

## Source

[Read the full story at TechCrunch](https://techcrunch.com/2026/09/09/sequoia-doubles-down-on-cymphony-as-ai-agents-create-new-enterprise-security-risks/)

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