Startup · United States

depthfirst

HQ San Francisco, United StatesFounded 202411-50 employees

AI-native security that thinks like an elite security research team and works across your code, dependencies, infrastructure, and live environment.

Products5

A product that validates findings by testing running applications with real attack paths.

Maturity not rated

A product that finds real vulnerabilities by analyzing business logic and data flows in code.

Maturity not rated

A product that blocks malicious packages before they enter the codebase.

Maturity not rated

A security model for vulnerability discovery and validation across enterprise repositories.

Maturity not rated

A product that validates code changes and ensures security before they are merged.

Maturity not rated

Show all 5 products

Newest unveiled first. Open a product for its milestone timeline, components and sources.

Cumulative raised$120M

Jan 14, 2026Mar 31, 2026

Funding rounds
Announced	Stage	Amount	Valuation	Lead investors	Other investors	Confidence
Mar 31, 2026	Series B	$80.0M	$580M?	Meritech Capital	Accel, Alt Capital, BoxGroup, Liquid 2 Ventures, MANTIS Venture Capital	Confirmed
Jan 14, 2026	Series A	$40.0M	—	Accel	Alt Capital, MANTIS Venture Capital, SV Angel	Reported

Totals add known amounts using recorded USD conversions where available; other currencies are shown separately. A ~ marks an estimated amount.

1
Databasedepthfirst - PitchBook company profile
PitchBook · Supports Organization · employee range, Organization · founded year, Organization · linkedin url, Organization · x url
“employee_range: 11-50 (profile: 25)”
2
DatabaseSixth-Domain public startup directory
Sixth-Domain · Supports Organization · country, Organization · kind
“{"country": "USA", "hq_iso2": "US", "id": "78d40b7c-a8ed-45ae-b0e9-031a317b1d13"}”
3
Databasedepthfirst - Crunchbase company profile
Crunchbase · Supports Organization · employee range, Organization · hq city, Organization · linkedin url, Organization · x url
“employee_range: 11-50 (profile: 11-50)”
4
Databasedepthfirst - LinkedIn company profile
LinkedIn · Supports Organization · hq city, Organization · linkedin url
“hq_city: San Francisco”

5
CompanyContinuous Cyber Defense
depthfirst · Supports Organization · description, Organization · name, Organization · website, System
“AI-native security that thinks like an elite security research team and works across your code, dependencies, infrastructure, and live environment.”
6
Companydepthfirst Research
depthfirst · Supports System
“dfs-large1 is our most capable model to date, designed for vulnerability discovery and validation across large enterprise repositories.”

7
CompanyApplied AI Lab depthfirst Announces $80 Million in Series B Funding
depthfirst · Mar 31, 2026 · Supports Funding round, Funding round · amount
“emerged from stealth with $40M in Series A funding”
8
NewsMeet The $580 Million Startup Making AI Models To Fight Artificial Hackers
Forbes · Mar 31, 2026 · Supports Funding round · post money valuation usd
“announced an $80 million raise at a $580 million valuation”
9
NewsAI security firm, depthfirst, announces $40 million Series A
TechCrunch · Jan 14, 2026 · Supports Funding round, Funding round · amount
“the company raised the round from Accel Partners, which led the investment, with participation from SV Angel, Mantis VC, and Alt Capital”

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