Security Startups

Company directory

5 companies. Sorted by name. No paid boost.

A

Aqua Security

Burlington, United States

  • Series E
  • $325M raised
  • Founded 2015

Code-to-runtime CNAPP that ranks CVEs by live workload behavior and can stop an exploit without waiting for a patch.

Raised $60M at a $1B-plus valuation, January 2024

C

Contrast Security

Los Altos, United States

  • Series E
  • $269M raised
  • Founded 2014

IAST, RASP, and ADR that instrument the running app so exploits are seen in the code path, not the packet.

Published the Software Under Siege 2025 report on application-layer attacks, August 2025

E

Expel

Herndon, USA

  • Series E
  • $289M raised
  • Founded 2016

Vendor-agnostic MDR that works on the SIEM and EDR you already bought.

Launched MDR coverage for the full AI attack surface, August 2026

H

Horizon3.ai

San Francisco, USA

  • Series E
  • $429M raised
  • Founded 2019

NodeZero autonomous pentest that exploits live networks the way an attacker would, continuously.

Raised $250M Series E at a $2B-plus valuation, August 2026

I

Island

Dallas, United States

  • Series E
  • $730M raised
  • Founded 2020

Enterprise browser that embeds DLP, ZTNA, and last-mile control into Chromium instead of another VDI farm.

Raised $250M Series E at a $4.8B valuation, March 2025