Founded in 2014, C5 Capital is a specialist growth investor backing technologies critical to the future of energy security, AI infrastructure, and cyber resilience. With offices in Washington, DC and London, the firm focuses on advanced nuclear energy, recognizing its essential role in powering AI and strengthening long-term energy security.
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C5 partners with ambitious, category-defining founders building scalable businesses with strong product-market fit and differentiated technology..
With a high-performing international team of 20 professionals, C5 offers a collaborative, entrepreneurial environment where individuals can make a meaningful impact..
THE ROLE
As Financial Controller, you will play a high-visibility role at the center of the firm’s financial operations, helping drive financial performance, reporting, controls, and strategic decision-making across multiple international entities.
Reporting directly to the CFO/VP of Finance in London, you will work closely with senior leadership across finance, operations, compliance, investor relations, and the investment team. This is an opportunity for someone who thrives in a fast-paced, hands-on environment and wants broad exposure within a dynamic global investment platform.
KEY RESPONSIBILITIES
- Lead financial reporting, cash management, and controls across UK, US, Austria, and Luxembourg entities
- Own budgeting, forecasting, treasury reporting, and financial analysis for senior management
- Oversee accounts payable, receivable, payroll coordination, and banking relationships
- Manage external audits, FCA filings, VAT submissions, and regulatory reporting
- Drive improvements to financial systems, processes, and internal controls
- Partner cross-functionally with investment, operations, and compliance teams
- Support and mentor junior finance team members
THE IDEAL CANDIDATE
- Qualified accountant (ACA, ACCA, or CIMA)
- 10+ years’ experience in financial control, ideally within private equity, venture capital, or an FCA-regulated environment
- Strong financial reporting, controls, and process improvement experience
- Commercial mindset with the ability to communicate effectively with senior stakeholders
- Confidence using MS Excel and financial software packages (i.e. Aqilla)
- Reliable, detail-oriented, and calm under pressure
- Eligibility to work in the United Kingdom
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