Noam Rathaus

Co-founder of Beyond Security, a cybersecurity company specializing in vulnerability research and disclosure.

Angel Investor Active Tel Aviv, Israel Est. 1999
LinkedIn
Last updated 2026-07-20
Portfolio
0
in our dataset
Rounds participated
0
Rounds led
0
Rounds' value
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total disclosed, rounds participated
Stages
Seed, A Round, Pre-Seed

About

Noam Rathaus is a cybersecurity expert who co-founded Beyond Security in 1999. He has a long history in the security field, having written four books on open-source security and penetration testing, and discovered over 40 software vulnerabilities. Beyond Security, which started as a two-person team, has grown into a worldwide operation with over 50 employees and branches in multiple countries. The company launched SecuriTeam Secure Disclosure (SSD) in 2007, a platform for acquiring vulnerabilities from security researchers and working with vendors for responsible disclosure.

Portfolio

No portfolio companies in this dataset yet.

Investment activity

Portfolio by sector

Cyber Security2

Q&A

What is Noam Rathaus's primary investment focus?
Noam Rathaus is an angel investor who focuses on early-stage deals, with a particular passion for cybersecurity startups.
What is Noam Rathaus's background in the cybersecurity sector?
Noam Rathaus is the CTO of Beyond Security, a company he co-founded without external funding. Beyond Security, which was acquired by HelpSystems in May 2021, provides automated vulnerability assessment and compliance solutions. He has also authored several books on cybersecurity topics.
What investment stages does Noam Rathaus typically participate in?
Noam Rathaus typically invests in Pre-Seed, Seed, and A Round stages.
Can you name some of Noam Rathaus's portfolio companies?
Noam Rathaus's portfolio includes cybersecurity companies such as DeviceTotal and Vicarius.
When was Noam Rathaus's most recent investment activity?
Noam Rathaus made an investment in February 2022, following another investment in August 2021.
What is the sector concentration of Noam Rathaus's portfolio?
All of Noam Rathaus's known portfolio companies are in the Cyber Security sector.
What is the typical check size for Noam Rathaus's investments?
Noam Rathaus's investment range is typically between $25K and $75K.
What was the funding stage and amount raised by Vicarius, a company in Noam Rathaus's portfolio?
Vicarius, a B2B cybersecurity company, raised $60.16M in its B Round.
What was the funding stage and amount raised by DeviceTotal?
DeviceTotal, an enterprise device security SaaS solution, raised $4.82M in its Seed round.
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