Financial Consulting Companies in Europe

ONISIS Consulting is a boutique financial-management advisory firm helping growing small and medium enterprises (€3M–€50M turnover) identify where money is lost, where capital is trapped, and which strategic decisions to make first.

We envision a generation of resilient enterprises: businesses that lead their sectors, stand on solid liquidity, and build lasting value that endures over time. Our mission is to unlock trapped value inside them, giving business owners the momentum and confidence to scale sustainably and stay competitive.

Founded by Konstantinos Kormentzas, a former banking C-level executive (CRO/Auditor/COO), ONISIS acts as an objective, un-fogged "second brain" for business owners. We combine executive-level banking rigor with agile operational execution, replacing generic advice with clear, empirical numbers.

Our Core Service Offerings:

• Fractional CFO Advisory: Senior-level financial governance, board-level sparring, and ongoing financial oversight without the overhead of a permanent C-suite hire.

• Cash Flow & Working Capital Optimization: Releasing trapped liquidity in receivables and slow-moving inventory to self-fund expansion and eliminate unnecessary debt.

• Profitability Enhancement: Granular customer- and SKU-level margin analysis to stop profit leakage from unmeasured discounts and legacy trading terms.

• Business Intelligence (Power BI): Custom executive reporting architectures that establish a Single Source of Truth (SSOT) across operations for five-minute decisions.

• Strategic Financial Planning & Financing: Bank-grade business plans, scenario forecasting, and debt restructuring advisory to secure financing on optimal terms.

Deep Dive was established to provide a truly comprehensive service for successful individuals and their families with sophisticated financial planning needs. Our founder, Peter, is a highly qualified member of the UK’s leading industry bodies for financial advice, but it’s a personal passion of his that informs Deep Dive’s singular approach.

Oakfield Park is an accountancy and business advisory firm supporting small and medium-sized companies across the UK. Headed up by Philip Gostling, Oakfield Park's services include accounts preparation, tax compliance, proactive tax planning and practical business advice.

With financial experience across a wide range of industries, the team aims to provide clear, practical guidance tailored to the needs of each business. Where additional expertise is required, Oakfield Park works with trusted specialists to help clients access the appropriate professional support.