a CFA Charterholder and Finance Subject Matter Expert (SME) with 15+ years of institutional banking experience. As a financial writer and modeling specialist based in London, I help investment firms, FinTechs, and startups communicate complex financial concepts with clarity and precision. 

My expertise spans financial modeling, investor deck creation, and strategic content development for the financial services industry. Whether you need a financial modeling consultant in London or a CFA financial writer for white papers and thought leadership, I deliver institutional-grade work that drives results.

Gustav Christopher Wagner, CFA 
15+ years banking experience | Former FinTech Founder | Institutional-grade financial models and thought leadership content that drive funding, growth, and market positioning.

Leveraging my financial expertise, I create authoritative content that builds your brand and engages your audience.

I deliver institutional-grade financial content and thought leadership that builds authority and drives engagement for investment firms, FinTechs, and financial institutions. As a CFA charterholder with 15 years of banking experience, I create white papers, market commentary, and strategic content that meets rigorous professional standards. My background as former Head of Savings at RCI Bank and Equity Sales at Unicredit MIB ensures every piece combines technical accuracy with clear, compelling narratives. I serve clients across London, Frankfurt, and Zurich, producing content that communicates complex financial concepts to sophisticated investors, regulators, and stakeholders. Whether you need ESG reporting, investment memos, or executive communications, my work establishes credibility and supports your strategic positioning in competitive markets.

I translate your vision into a compelling narrative, backed by rigorous financial data, to win over investors and stakeholders.

My approach to business plan documentation combines strategic narrative development with meticulous financial modeling integration. I build comprehensive plans that serve multiple stakeholders: investors seeking return potential, lenders requiring risk assessment, and internal teams needing strategic alignment. This includes detailed market analysis, operational planning, go-to-market strategy, and five-year financial projections with scenario analysis. Every business plan I create undergoes stress-testing against industry benchmarks and regulatory requirements specific to your sector—whether FinTech, asset management, or financial services. The result is a professional document that withstands due diligence scrutiny while compelling readers to act. I also provide ongoing support for plan updates as your business evolves and market conditions change.

The analytical foundation for your business. I can build everything from 3-statement projections to complex LBO and M&A models.

I build robust, institutional-grade financial models that secure funding, make critical business decisions, and drive strategic growth. My financial modeling services include three-statement models, DCF valuations, and scenario analysis for startups and established businesses. As a financial content writer, I also create strategic content and white papers for finance companies in both German and English. My background as a former Head of Savings at RCI Bank and Equity Sales at Unicredit MIB gives me deep expertise in retail banking, investment products, and capital markets. This unique combination of banking experience and content expertise ensures your financial communications are both accurate and compelling.

I build robust, institutional-grade financial models that secure funding, make critical business decisions, and drive strategic growth. My financial modeling services include three-statement models, DCF valuations, and scenario analysis for startups and established businesses. As a financial content writer, I also create strategic content and white papers for finance companies in both German and English. My background as a former Head of Savings at RCI Bank and Equity Sales at Unicredit MIB gives me deep expertise in retail banking, investment products, and capital markets. This unique combination of banking experience and content expertise ensures your financial communications are both accurate and compelling.

"Gustav is very easy to work with, he's very organised and takes feedback into account when submitting drafts. The quality of the writing is very good and not many edits are needed, if at all. He also adheres to the agreed schedule so you can rely on him when planning your content calendar."
Florence Couëdel, Marketing Director, Leading FX Platform

"Gustav is a great writer, he is very responsible, adheres to deadlines, offers ideas and feedback and writes valuable content that readers like. Highly recommend!"
Alexandra Kazakova, Marketing Director, venture-backed PropTech

A Finance Subject Matter Expert (SME) is a professional with deep expertise in financial markets, products, and regulations. As a CFA Charterholder with 15+ years of banking experience, I provide expert-level financial writing and modeling services.

A financial writer with CFA charter (a CFA charterholder) combines technical financial expertise with professional writing skills to create content for investment firms, FinTechs, and financial services companies. This includes white papers, investor decks, financial models, and regulatory documentation.

Yes, I work with clients across the UK, Germany, and international markets as far as Australia, Singapore, Korea and Japan. I provide financial content in both English and German, serving FinTechs, investment firms, and financial services companies globally.

Tell me some details about your project and I will get back to you with an initial assessment.