# Sublime Security

Startup profile on Capital Atlas: https://capitalatlas.ai/startups/sublime-security

- Industry: IT Security/Cybersecurity
- Headquarters: Washington, US
- Website: www.sublime.security
- Total disclosed funding: $238M
- Latest round: Series C (Oct 28, 2025)
- Investors on record: 8

## About

Founded in 2019 by its CEO, Joshua Kamdjou, and COO, Ian Thi, and based in Washington, US, Sublime Security, Inc., operates as a software company that offers a cybersecurity platform that helps companies manage digital risks. In December 2024, Sublime Security, Inc. raised USD 60 million in series B funding led by new investor Institutional Venture Partners, with participation from returning investors Decibel, Index Ventures, and Slow Ventures. New investor Citi Ventures also participated in the round. As of 2023, the company has a client base that includes companies like Spotify, Primer, Pipe, Grey Noise, and many more. Sublime Security offers various cyber security solutions that include protection from credential and call-back phishing, malware, ransomware, VIP impersonation, and business email compromise. The company also provides an open platform offering inbound email security, attack surface reduction, purple teaming, and red teaming, blocking new domains, operationalizing threat intel, threat hunting, and automating user reporting. It provides standalone tools like EmailRep, EML Analyzer, and custom integration services. In October 2025, Sublime Security, Inc. raised USD 150 million in series C funding led by new investor Georgian, with participation from other new investors 01A and Avenir Growth Capital. Returning investors Citi Ventures, Index Ventures, Institutional Venture Partners, and Slow also participated in the round.

The company plans to use the October 2025 funding to to improve its email security system by adding artificial intelligence tools that detect and block harmful messages.

## Funding rounds

- Series C, Oct 28, 2025, $150M — Index Ventures, Institutional Venture Partners, Georgian, Slow, Citi Ventures, Avenir Growth Capital, 01A
- Series B, Dec 12, 2024, $60M — Index Ventures, Institutional Venture Partners, Slow, Citi Ventures, Decibel
- Series A, Apr 24, 2024, $20M — Index Ventures, Slow, Decibel
- Seed, Jan 25, 2022, $8M — Slow, Decibel

## Investors

- Slow (https://capitalatlas.ai/funds/slow) — Seed, Series A, Series B, Series C
- Decibel (https://capitalatlas.ai/funds/decibel) — Seed, Series A, Series B
- Index Ventures (https://capitalatlas.ai/funds/index-ventures) — Series A, Series B, Series C
- Institutional Venture Partners (https://capitalatlas.ai/funds/institutional-venture-partners) — Series B, Series C
- Citi Ventures (https://capitalatlas.ai/funds/citi-ventures) — Series B, Series C
- Georgian — Series C
- Avenir Growth Capital (https://capitalatlas.ai/funds/avenir-growth-capital) — Series C
- 01A (https://capitalatlas.ai/funds/01a) — Series C