
Sas Nathar
ACA-qualified Fractional CFO helping start-ups, scale-ups and charities raise finance, transform operations and build scalable, insight-led finance functions.
CFO Profile
Sas is an ACA-qualified Fractional CFO and Finance Transformation Leader with more than 19 years' finance experience across the UK and Australia, including over 14 years post-qualification. He partners with founders, CEOs and Boards across start-ups, scale-ups, charities, property, retail, healthcare and education.
He specialises in fundraising and debt finance, strategic planning, cash flow and working capital, board reporting, finance transformation and systems implementation. Sas has supported successful equity fundraising, long-term refinancing and growth funding, while helping organisations improve profitability, strengthen controls and make better decisions through clear, commercially focused management information.
A key differentiator is his ability to design practical, scalable finance operating models. He combines the best in-house capability with specialist outsourcing, modern systems and advanced AI tools, including Claude and Gemini, to create leaner and more effective finance functions. He is highly skilled at using AI to accelerate analysis, modelling, research, process design and day-to-day delivery.
His approach is hands-on and collaborative: he works alongside leadership teams to solve immediate issues while building the people, processes and systems required for sustainable growth.
CFO Highlights
- ACA-qualified finance leader with 19+ years' finance experience in the UK and Australia, and Fractional CFO experience since 2022.
- Trusted partner to founders, CEOs, Boards and investors across start-ups, scale-ups, SMEs and not-for-profits.
- Fundraising and debt finance expertise, including investor models, pitch materials, refinancing, working-capital facilities and due diligence.
- Delivered a 39% reduction in finance operating costs through hybrid operating-model redesign and specialist outsourcing.
- Led refinancing, organisation-wide systems transformation and the outsourcing of finance and operational activities for an impact consumer scale-up.
- Supported successful Series B fundraising and built an internal finance function from a fully outsourced model.
- Finance transformation experience across NetSuite, Xero, Dynamics 365, Power BI, Fathom, Moss and Spendesk, with advanced use of AI tools including Claude and Gemini.
- Strong in cash flow, working capital, budgeting, forecasting, multi-year planning, KPI reporting and board reporting.
- Commercial, pragmatic and hands-on, moving confidently between strategic Board advice and detailed delivery.
Client Testimonials
Ocean Botte
Sas served as our fractional CFO from November 2025 to July 2026, and his impact on the business was significant. He had a rare ability to balance critical, day-to-day financial operations with longer-term strategic work, from building robust budgets to engaging and managing relationships with advisors to deliver the right financing solutions for us.
His experience spanned the full breadth of finance, including audit, tax, international expansion, and insurance, giving us confidence that no area was overlooked. He joined us during a period of challenging trading conditions, and his steady hand and deep expertise were instrumental in helping us navigate that period and come out the other side in a stronger position.
We'd recommend Sas without hesitation to any business looking for an experienced, versatile, and reliable fractional CFO.
Brighter Futures Housing Group
Sas joined us at a very challenging time within our organisation, with a number of high-level competing priorities/projects, and during a crucial transition of the internal finance service. Working with the Board, the Executive and wider teams, he has become part of the team very quickly.
Sas’s strategic and technical expertise is all that you would expect with someone who works on a fractional basis. Sas understood immediately where we were, and my concerns, and immediately saw a way forwards. Although a fractional CFO (understanding there were other clients), Sas always ensures that he delivers on what we need.
What I also value about Sas is that he wants to continue to upskill and understand our sector better, in order to ensure that, as we move into the next phase, he can continue to offer us all the benefits of a Strategic FD.
However, what has been equally important, in a values-based, smaller housing organisation, is who Sas is as a person. Sas is very honest and straightforward, with the ability to provide solutions, calm oversight, and deal swiftly with any issues arising. But it’s his genuine approach, ability to treat people with respect and gain that respect, along with his humour, that has meant Sas has just effortlessly become part of our organisation.
Case Studies
UK Housing Association – Finance Operating Model Transformation
UK Housing Association – Finance Operating Model Transformation
Challenge
Following significant personnel change, the organisation needed to stabilise finance operations while reducing cost and improving control.
Action
Sas designed a hybrid model combining internal finance business partnering with specialist outsourced accounting and compliance. He introduced Xero, Moss and Fathom and rebuilt reporting, forecasting and governance.
Outcome
Finance operating costs reduced by 39%, accountability and controls improved, and the organisation gained a scalable platform to support portfolio growth and funding activity.
Impact Consumer Scale-Up – Refinancing, Systems Transformation and Outsourcing
Impact Consumer Scale-Up – Refinancing, Systems Transformation and Outsourcing
Challenge
Rapid growth had created fragmented systems, limited visibility across sales, operations and finance, and a need to secure additional funding while building a more scalable operating model.
Action
Sas led a refinancing process and an organisation-wide transformation of the systems stack across sales, operations and finance. He also redesigned reporting and cash flow management and led the outsourcing of selected finance and operational activities.
Outcome
The business improved visibility over cash, profitability and operational performance, strengthened its funding position and established a more scalable, technology-enabled operating model for continued growth and international expansion.
Retail Scale-Up – Fundraising and Finance Function Build
Retail Scale-Up – Fundraising and Finance Function Build
Challenge
A fully outsourced finance model lacked the speed, ownership and management information needed for the next stage of growth.
Action
Sas built an internal finance function, developed investor models and pitch materials supporting a Series B round, implemented Spendesk and Connecteam, and introduced five-year planning, cash flow forecasting and faster monthly reporting.
Outcome
The business received successful fundraising support, strengthened controls and gained more timely information for inventory, cost and operational decisions.
Diversified Property Group – Systems Transformation and Refinancing
Diversified Property Group – Systems Transformation and Refinancing
Challenge
The group required faster reporting, stronger operational insight and greater long-term funding certainty.
Action
Sas led implementation of Microsoft Business Central and Power BI, introduced a comprehensive group Board pack and KPI dashboards, and supported a significant long-term refinancing.
Outcome
Reporting moved from quarterly to monthly, management visibility improved, and the refinancing strengthened the going-concern position and strategic planning.
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