Software security startup Depthfirst on Wednesday announced raising $40 million in a Series A funding round led by Accel.
Alt Capital, BoxGroup, Liquid 2 Ventures, Mantis VC, SV Angel, and multiple angel investors also participated in the round.
An applied AI lab founded in 2024 by DeepMind, Databricks, and Faire technical leaders, San Francisco-based Depthfirst has built a platform that identifies, triages, and resolves vulnerabilities across different software and infrastructure layers.
The startup’s General Security Intelligence platform relies on AI agents to understand enterprise systems and respond to AI-empowered attacks at the same pace.
The platform, the company says, is surfacing eight times more flaws compared to traditional security solutions, and is already used by leading businesses such as AngelList, Lovable, Moveworks, and Supabase.
According to Depthfirst, the solution performs deep scans to fully understand an organization’s code, context, and threat model, to identify vulnerabilities before exploitation occurs and harden the global software stack.
The company will use the new funds to support its research and development and go-to-market efforts and to expand its applied research, engineering, product, and sales teams.
“Depthfirst felt like adding an autonomous senior product-security engineer to our team. It quickly surfaced our top issues and got smarter over time by tracking context across scans, eliminating false positives, and opening ready-to-merge fixes our developers immediately understand. It’s doubled the efficiency of our security-engineering team,” AngelList head of security Alberto Martinez said.
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