Organization · Venture Capital
C5 Capital
C5 Capital is a venture capital and private equity firm based in London, specializing in investments in cybersecurity, space, and nuclear energy. The firm focuses on mid to late-stage companies addressing critical global challenges related to national security and environmental sustainability.
Overview
What C5 Capital does
What C5 Capital is
C5 Capital is a venture capital and private equity firm based in London, specializing in investments in cybersecurity, space, and nuclear energy. The firm focuses on mid to late-stage companies addressing critical global challenges related to national security and environmental sustainability.
How it participates in the startup ecosystem
The current public profile supports funder capabilities. Each capability below is shown separately so organization identity and role-specific information do not get conflated.
Operational profile
Organization status and context
Organization status describes the entity itself. Funding and program availability appear within the relevant capability profile.
- Operational status
- Active
- Organization type
- Venture Capital
- Founded
- Founded in 2016
- Approximate age
- About 10 years
- Structured capabilities
- Funder
- Last reviewed
- April 28, 2026
Official channels
Find C5 Capital elsewhere
Open the official website or a supported primary organization account.
Capability profile
C5 Capital as a funder
Investment thesis
C5 Capital invests where digital and energy security overlap with critical infrastructure, focusing on cybersecurity, space technologies, and nuclear energy to support national and energy security.
Focus narrative
C5 Capital invests in three primary sectors: cybersecurity, space, and nuclear energy. The firm targets mid to late-stage companies in the cybersecurity sector and earlier-stage companies in the space sector, emphasizing technology-driven industries that align with its mission of creating a secure digital future while addressing environmental sustainability and ESG objectives.
Value beyond capital
C5 Capital provides value to its portfolio companies through long-term founder relationships, go-to-market execution support, strategic introductions, geographic expansion assistance, and access to an operating-partner network that spans government and private-sector security expertise.
Focus and fit
- Stages
- Seed · Series A · Series B · Series C · Series D · Growth Equity
- Sectors
- Cybersecurity · Cloud Infrastructure · Clean Energy · Nuclear Energy
- Regions
- Global
Availability
- Currently deploying
- Not published
Portfolio and track record
- Recorded portfolio count
- 5
- Recorded notable exits
- Shape Security
Portfolio context
Axiom Space: Developing the first commercial space station. Synack: A crowdsourced security platform providing continuous application security and penetration testing. Oomnitza: An enterprise technology management solution. Kevala: A cloud-based grid analytics platform for optimizing electricity infrastructure. Panoply: A cloud data platform that simplifies data warehousing and management.
Common questions
What to know about C5 Capital
Upseed classifies C5 Capital under the Venture Capital organization type. Its current public profile includes funder capabilities.
Source and update disclosure
Know what this page is based on
Source basis
Public organization and program material, official websites, and structured Upseed records.
Last reviewed
April 28, 2026
Known limits
Capability profiles appear only when a structured public profile also contains decision-useful role evidence. Terms and availability can change.
Upseed is an independent guide. It is not affiliated with or endorsed by the organization described on this page.