AI security startup Glow raises $180m at $1.2bn valuation to block device threats

Glow has emerged from stealth with $180m in funding, valuing the AI security startup at $1.2bn. The round was led by Sequoia, Cyberstarts, Greenoaks and Redpoint Ventures, with Index Ventures and Lux Capital also participating. Founded in 2025 and operating across Tel Aviv and Palo Alto, the company already employs nearly 100 people.

The startup uses AI agents powered by Anthropic and Google Gemini models to map device activity and block unapproved software before it executes. “Prevention was always the right answer in security. It just never worked at enterprise scale without blocking the business,” Tiger said.

This strategy addresses a rapid expansion in corporate AI adoption, which Glow estimates has surged from 15% to 45% of device usage over the past year. Much of this activity is unapproved, widening the attack surface just as adversaries deploy advanced models. The startup claims its system has already prevented malicious code packages from installing on customer devices across the healthcare, retail and financial sectors.

Securing a billion-dollar valuation before disclosing any revenue places Glow among a growing cohort of artificial intelligence security firms mimicking the trajectory of Israeli cyber giant Wiz. Several of Glow’s backers also funded Wiz during its rapid ascent. The valuation signals strong investor appetite for AI-native security tools, even as entrenched rivals like CrowdStrike, Microsoft and SentinelOne dominate the endpoint market.

The commercial success of Glow’s automated blocking model will ultimately depend on enterprise trust, a metric complicated by Tiger’s history. He previously served as a vice president of engineering at Meta, where he co-founded the Onavo data-analytics app.

Legal filings unsealed in 2024 revealed that Meta repurposed the Onavo application to intercept and decrypt the encrypted traffic of competitors including Snapchat, YouTube and Amazon. Apple removed the software in 2018 and Meta discontinued it the following year, with court documents describing the conduct as criminal.

Tiger has not publicly addressed his role in the Onavo controversy, and the startup's launch materials omit the history. The central question for global markets is whether corporate buyers will hand autonomous control of their devices to an AI agent built by a founder whose previous work secretly monitored them.