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CyLon Ventures

Venture capital

London · Pre-Seed–Seed · 12 people tracked

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Investment thesis

CyLon believes security serves as an essential foundation enabling innovation across emerging technologies including autonomous vehicles, digital health systems, and intelligent energy infrastructure. The firm supports startups developing high-impact security solutions across diverse applications such as workforce training, identity management, and threat intelligence. The investment thesis emphasizes that no future technology platform can realize its full potential without secure underlying systems.

Invests inCybersecurityLondon

Source: firm website, verified Jul 21, 2026.

Stage
Pre-Seed–Seed
HQ
London, GB
Leads rounds
Follows
Instruments
Equity
Founded
2020
Tracked investments
29

Team · 12 people

from the firm's website
Grace Cassy· Investing

Grace co-founded CyLon in 2015 and brings a decade of experience from the UK Diplomatic Service where she worked on global security policy across Asia, Europe, and the Americas. She served as an advisor to Prime Minister Tony Blair from 2004-2006 and co-founded Epsilon Advisory Partners.

Jonathan Luff· Investing

Jonathan co-founded CyLon in 2015 and previously served as a senior British Diplomat in various UK Government roles, including as advisor to Prime Minister David Cameron. He also co-founded Epsilon Advisory Partners, a strategy and growth consulting firm.

Adam Fletcher· CISO, The Blackstone Group

Adam Fletcher serves as CISO at The Blackstone Group since 2014, managing information security for the firm. He previously held senior security roles at major corporations including Equifax, McAfee, Nokia, and Accuvant.

Christopher Ahlberg· Co-founder and CEO of Recorded Future

Christopher Ahlberg is CEO of Recorded Future, Inc. and Chairman of Hult International Business School with extensive entrepreneurial success. He founded the Spotfire Division in 1996, which sold to TIBCO for $195 million, and later saw Recorded Future acquired by Insight Partners for $780 million in 2019.

Ciaran Martin· Former-CEO, National Cyber Security Centre

Ciaran Martin is a Professor of Practice at Oxford's Blavatnik School of Government and was the founding director of the UK National Cyber Security Centre, which he led for four years through 2020. He held multiple senior Cabinet Office roles and is recognized as a leading global authority on cybersecurity.

Deneen DeFiore· CISO, United Airlines

Deneen joined United Airlines as Vice President and Chief Information Security Officer, responsible for securing operations, products, and information systems. She previously held the role of Global Chief Information & Product Security Officer at GE Aviation.

Jim Rutt· CISO, Dana Foundation

Jim Rutt serves as Chief Information Officer and CISO at the Dana Foundation, responsible for strategic IT planning and technology operations. With 24 years of technology experience across financial, healthcare, and pharmaceutical sectors, he is an early adopter of cloud security solutions and advisor to multiple venture capital firms and startups.

Maria Lewis Kussmaul· Co-Founder of AGC Partners

Maria is co-founder of AGC Partners and leads the firm's cybersecurity investment banking practice. She previously co-founded Castile Ventures, a seed and early-stage venture capital firm, and spent three decades in Wall Street finance, becoming global head of data networks and internet banking at Cowen & Co.

Matt Comyns· Managing Partner of Caldwell

Matt Comyns is Managing Partner of Caldwell's Cyber Security Practice, specializing in executive recruitment for information security leaders. He previously led the Global Cyber Security Practice at Russell Reynolds Associates and founded strategic advisory firms in digital media and China consulting.

Min-Liang Tan· Co-Founder & CEO of Razer

Min-Liang Tan co-founded and leads Razer Inc (HKEK: 1337), growing it from a two-person startup to a multinational market leader valued above $1 billion and publicly listed on the Hong Kong Stock Exchange in 2017. He is also Chairman and CEO of THX Ltd.

Sir Anthony Finkelstein· Former Chief Scientific Advisor for National Security, HM Government

Anthony served as HM Government Chief Scientific Adviser for National Security from 2015-2021 and is now President of City, University of London. His expertise spans software development tools and processes, and he is an active entrepreneur and founder of multiple startups.

Yuval Diskin· Ex-Director of Israeli Internal Security Service

Yuval Diskin served as Director of the Israel Security Agency for six years from 2005-2011, overseeing counter-terrorism, counter-intelligence, aviation security, and critical infrastructure protection. He transitioned to the tech sector post-retirement with a focus on cybersecurity.

What they invest in

from 3 of 29 portfolio companies

Cybersecurity ×3Enterprise Software ×3AI & Machine Learning ×1Cloud Computing ×1Developer Tools ×1SaaS ×1

HQs:United Kingdom×1

Investments · 29 tracked

founders shown can be your intro path
Beauceron
Cadosecuritycadosecurity.com

Cado Security provides cloud-native forensics and incident response automation that captures disk-level evidence across multi-cloud environments. The platform enables faster alert triage and root cause analysis for organizations investigating security incidents in cloud infrastructure.

Cloud ComputingCybersecurityDeveloper ToolsEnterprise Software

CyberSmart
Digdig.security
Fenix24fenix24.com
Gisualgisual.comin
Go to websiteriskledger.comin𝕏

Risk Ledger builds a third-party risk management platform that connects organizations to monitor and manage cybersecurity risks in their supply chains. The platform serves enterprises seeking visibility and control over supplier and vendor security.

CybersecurityEnterprise SoftwareSaaSLondon, GB

Haydn BrooksDaniel Saul

Hadrianhadrian.io
Hadrian
Hazyhazy.com
Hazy
Immersive Labs
Mondoomondoo.ioin𝕏
NB • 2017beauceronsecurity.comin𝕏
Risk Ledger
Seedataseedata.io
Senseonsenseon.ioin𝕏
SenseOn
Silentpushsilentpush.comin𝕏
Soveren
Soverensoveren.io

Sensitive data observability company helping organizations protect consumer data records without impacting business performance.

Teleskope
Teleskopeteleskope.aiin
Tessiantessian.comin𝕏

Tessian provides AI-powered email security solutions that detect and prevent email-based cyberattacks and data loss for enterprises. The platform combines behavioral detection technology with data loss prevention capabilities to protect organizations against threats targeting the human layer of security.

AI & Machine LearningCybersecurityEnterprise Software

Vena Security
Venasecurityvenasecurity.comin
Worldrworldr.com
Xapienxapien.comin𝕏
Zamnazamna.com

Frequently asked questions

What stage does CyLon Ventures invest at?
CyLon Ventures invests at the Pre-Seed, Seed stages.
What sectors does CyLon Ventures focus on?
CyLon Ventures focuses on Cybersecurity.
Where is CyLon Ventures located?
CyLon Ventures is headquartered in London, GB.
Does CyLon Ventures lead rounds?
CyLon Ventures typically participates in rounds rather than leading them.

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