Reach Security lands $50M Series B to fight AI-powered attacks
What's the deal? Reach Security has raised more than $50 million in a Series B round led by Top Tier Capital PartnersDealroom has a profile for this one. Try Dealroom →. The San Francisco company builds AI that reads the live configuration of the security products an enterprise already owns, determining whether an exploit path is blocked or still reachable — and remediating it if protection drifts.
Who's backing it? Ballistic VenturesDealroom has a profile for this one. Try Dealroom →, In-Q-Tel, M12, Microsoft's Venture Fund, and existing investors joined the round. In-Q-Tel's involvement signals interest from the US intelligence community as Reach pushes into the federal market.
Why now? AI has lowered the cost of finding vulnerabilities and sped up attacks. CrowdStrike's 2026 Global Threat Report found AI-enabled adversary operations rose 89%, with attacker breakout times down to as little as 27 seconds.
What's the endgame? Reach wants to shift defense from human-paced to machine-speed. The company also launched Reach Everywhere, which brings its security control insights into the tools where teams already work. The funding will support product development, integration partnerships, international expansion, and growth in the US enterprise and federal markets.
The quote: "AI has given attackers better economics and a lower barrier to entry, but it has also given defenders a chance to use their home field advantage more than ever," said Garrett Hamilton, chief executive officer and co-founder.
By the numbers: Reach has doubled its customer base over the past 12 months, counting Autodesk, InsurityDealroom has a profile for this one. Try Dealroom →, MPSDealroom has a profile for this one. Try Dealroom →, and Ensemble Health PartnersDealroom has a profile for this one. Try Dealroom → among its users. Only one detail grounds the raise in sector terms: at more than $50 million, it ranks in the top 10% of all Series B security rounds in the US.
The signal: Enterprises are starting to point AI at their own defenses, not just their attackers. Reach is betting that the edge lies less in finding new threats than in proving existing controls actually work — turning configuration data into a usable source of truth.
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Image credit: Reach Security
