Depthfirst Raises $80 Million in Series B Funding

Software security startup Depthfirst has raised $80 million in Series B funding, bringing the total raised to $120 million in less than three months after closing its Series A funding round in mid-January. The investment was led by Meritech Capital, with additional support from Forerunner Ventures, The House Fund, and previous backers Accel, Alt Capital, Box Group, Liquid 2 Ventures, and Mantis VC. Based in San Francisco, Depthfirst is an applied AI lab founded in 2024 by DeepMind, Databricks, and Faire technical leaders, focused on addressing weaknesses across software and infrastructure layers. Along with the fresh funding, the company announced the launch of Dfs-mini1, its first in-house security model, focused on securing cryptocurrency smart contracts. Built on an open source model and part of Depthfirst’s effort to integrate specialized intelligence capabilities into its security platform, Dfs-mini1 was trained in security-specific environments. According to the startup, the security model can generalize beyond smart contracts, meaning that the training approach transfers across security domains. Depthfirst will use the new funds to expand its AI research team, train additional security models across new security domains, and scale enterprise adoption. “To win in security, companies will need to deploy security-specific models in products optimized for real security workflows. To build these models, you need specialized data, domain-specific evaluation, and deep expertise in post-training. Our team is one of the few in security able to do that,” said Depthfirst co-founder and CEO Qasim Mithani. Related: Allure Security Raises $17 Million for Online Brand Protection Related: 1stProtect Emerges From Stealth With $20 Million in Funding Related: Raven Emerges From Stealth With $20 Million in Funding Related: Manifold Raises $8 Million for AI Detection and Response WRITTEN BY Ionut Arghire Ionut Arghire is an international correspondent for SecurityWeek. More from Ionut Arghire TeamPCP Moves From OSS to AWS Environments CrewAI Vulnerabilities Expose Devices to Hacking Exploitation of Critical Fortinet FortiClient EMS Flaw Begins StrongSwan Flaw Allows Unauthenticated Attackers to Crash VPNs Lloyds Data Security Incident Impacts 450,000 Individuals Huskeys Emerges From Stealth With $8 Million in Funding Russian APT Star Blizzard Adopts DarkSword iOS Exploit Kit Telnyx Targeted in Growing TeamPCP Supply Chain Attack Latest News Toy Giant Hasbro Hit by Cyberattack New DeepLoad Malware Dropped in ClickFix Attacks Exploited Zero-Day Among 21 Vulnerabilities Patched in Chrome FBI Warns of Data Security Risks From China-Made Mobile Apps US Charges Uranium Crypto Exchange Hacker Webinar Today: Agentic AI vs. Identity’s Last Mile Problem Axios NPM Package Breached in North Korean Supply Chain Attack Google Addresses Vertex Security Issues After Researchers Weaponize AI Agents Trending Webinar: Securing Fragile OT In An Exposed World March 10, 2026 Get a candid look at the current OT threat landscape as we move past "doom and gloom" to discuss the mechanics of modern OT exposure. Register Webinar: Why Automated Pentesting Alone Is Not Enough April 7, 2026 Join our live diagnostic session to expose hidden coverage gaps and shift from flawed tool-level evaluations to a comprehensive, program-level validation discipline. Register People on the Move Moderna has promoted Farzan Karimi to Deputy Chief Information Security Officer. Brian Goldfarb has been appointed Chief Marketing Officer at SentinelOne. Token has appointed Katy Nelson as Chief Revenue Officer. More People On The Move Expert Insights The Next Cybersecurity Crisis Isn’t Breaches—It’s Data You Can’t Trust Data integrity shouldn’t be seen only through the prism of a technical concern but also as a leadership issue. (Steve Durbin) Why Agentic AI Systems Need Better Governance – Lessons From OpenClaw Agentic AI platforms are shifting from passive recommendation tools to autonomous action-takers with real system access, (Etay Maor) The Human IOC: Why Security Professionals Struggle With Social Vetting Applying SOC-level rigor to the rumors, politics, and 'human intel' can make or break a security team. (Joshua Goldfarb) How To 10x Your Vulnerability Management Program In The Agentic Era The evolution of vulnerability management in the agentic era is characterized by continuous telemetry, contextual prioritization and the ultimate goal of agentic remediation. (Nadir Izrael) SIM Swaps Expose A Critical Flaw In Identity Security SIM swap attacks exploit misplaced trust in phone numbers and human processes to bypass authentication controls and seize high-value accounts. (Torsten George) Flipboard Reddit Whatsapp Email