Stacksi
Acquired
What they do:
Automated Answers to Security Questionnaires
Quick facts:
HQ: Los Angeles, CA, United States
Top Cybersecurity Startups in California
This list has 132 startups and was last updated on Oct 15, 2026. 35 of them are hiring right now. Biggest hubs: San Francisco (125), Los Angeles (2), and Palo Alto (2). Largest teams: Vanta, TRM Labs, and Teleport. Latest round: Autonomous Cyber raised $2.55M (Apr 21, 2026).
132 startupsPage 4 of 4
Cryptoseal
Acquired
What they do:
Server key management, VPN as a Service, Privacy VPN. Sold to…
Quick facts:
HQ: San Francisco, CA, United States
CyberFend
Acquired
What they do:
Cyberfend delivers robust, real-time web and mobile security by…
Quick facts:
HQ: San Francisco, CA, United States
Fabric
Acquired
What they do:
Fabric is a personal location-based journal that catalogs experiences…
Quick facts:
HQ: San Francisco, CA, United States
Bouncer
Acquired
What they do:
SDK for scanning and verifying credit cards and photo IDs in mobile…
Quick facts:
HQ: San Francisco, CA, United States
Fuzzbuzz
Acquired
What they do:
Fuzzing as a Service
Quick facts:
HQ: San Francisco, CA, United States
YC W19Early stage
ThinAir
Shut down
What they do:
Intelligent data security for teams
Quick facts:
HQ: San Francisco, CA, United States
Squire.ai
Shut down
What they do:
Never code alone.
Quick facts:
HQ: San Francisco, CA, United States
Tesseral
Shut down
What they do:
The open source platform for managing identity in business software
Quick facts:
HQ: San Francisco, CA, United States
Visual One
Shut down
What they do:
AI for security cameras
Quick facts:
HQ: San Francisco, CA, United States
Bifrost
Shut down
What they do:
Wills and Estate Management for Crypto
Quick facts:
HQ: San Francisco, CA, United States
Bannerman
Shut down
What they do:
Security Guard Company Marketplace
Quick facts:
HQ: San Francisco, CA, United States
SlashAuth
Shut down
What they do:
The solution for fine-grained access control in web3
Quick facts:
HQ: San Francisco, CA, United States
Notebook Labs
Shut down
What they do:
Decentralized, anonymous, and accountable identity on Web3.
Quick facts:
HQ: San Francisco, CA, United States
Patchwork Security
Shut down
What they do:
Security patch notifications for servers. Build it, deploy it, and…
Quick facts:
HQ: San Francisco, CA, United States
Metapacket
Shut down
What they do:
Metapacket is the first selective web gateway that stops malware by…
Quick facts:
HQ: San Francisco, CA, United States
EnvKey
Shut down
What they do:
End-to-end encrypted configuration and secrets management
Quick facts:
HQ: San Francisco, CA, United States
Federacy
Shut down
What they do:
Penetration testing and bug bounty platform.
Quick facts:
HQ: San Francisco, CA, United States
Preclusio
Shut down
What they do:
We help companies comply with privacy laws like GDPR. Many of these…
Quick facts:
HQ: San Francisco, CA, United States
Blyss
Shut down
What they do:
End-to-end encrypted AI.
Quick facts:
HQ: San Francisco, CA, United States
Vizly
Shut down
What they do:
Data to insights in seconds
Quick facts:
HQ: San Francisco, CA, United States
Aedilic
Shut down
What they do:
Open-Source AI-generated image/deepfake detection
Quick facts:
HQ: San Francisco, CA, United States
Traversal Networks
Shut down
What they do:
Enterprise Threat Detection: Tuning, Triage, and Analysis by Experts.
Quick facts:
HQ: San Francisco, CA, United States
Documents.Me
Shut down
What they do:
Client-side encryption for your devices and the cloud.
Quick facts:
HQ: San Francisco, CA, United States
YC W12Early stage