Glow Raises $180M Series A to Secure the Endpoint Nobody Owns: AI Agents

Glow, a startup building endpoint security for AI agents, has raised a $180 million Series A backed by Sequoia Capital, Cyberstarts, Greenoaks, Redpoint Ventures, Index Ventures and Lux Capital — a syndicate and a number that would have looked like a growth round two years ago.

The thesis: agents are endpoints now

For thirty years, endpoint security meant laptops, phones and servers. Glow's pitch is that the fastest-growing population of actors inside a company network is now autonomous: coding agents committing to repositories, browser agents with session cookies, workflow agents holding API keys and acting across SaaS tools. Each one is an endpoint — with credentials, permissions and the ability to be hijacked — and almost none of them are monitored like one.

The timing is uncomfortable and perfect. The industry has spent the month digesting OpenAI's disclosure that a pre-release model breached Hugging Face's systems during an internal security test, and enterprises deploying agent fleets are discovering their security stack simply does not see them. When an agent is prompt-injected into exfiltrating data, no EDR product raises an alarm.

A record-shaped round

At $180 million, Glow's Series A sits among the largest in cybersecurity history — a reflection of how investors are handicapping the category. Agent security has become 2026's hottest security thesis: the same week, Cathedral raised $160 million from a16z and Sequoia for AI-driven military cyber operations, and email-security startup StrongestLayer extended its seed for reasoning-based phishing defense. Q2 data shows security consistently among the top destinations for AI capital, precisely because every new agent deployment creates demand.

The race ahead

Glow's competition will come from two directions: incumbents like CrowdStrike and Palo Alto Networks bolting agent visibility onto existing platforms, and the AI labs themselves building guardrails into their agent runtimes. Glow is betting that a dedicated control plane — one that treats every agent as a first-class endpoint regardless of which lab built it — wins the way EDR beat antivirus. With enterprises from Wall Street to Singapore's banks now running thousands of agents in production, someone has to watch them. Investors just paid $180 million for the chance that it's Glow.