Fractional CFO software — that scales your portfolio.
Fractional CFO software is the layer that lets one practitioner run CFO-level analysis across a portfolio of client companies: a separate workspace per client, isolation between them, and briefs produced in minutes rather than days. It moves the constraint on a practice from hours to clients — and it is the difference between selling advice and selling time.
Last updated: 12 October 2026 · Oakmont Kingsley Ltd
Where a fractional practice breaks
Every new client arrives with the same shape of work: their ledger, their questions, their month-end. Done by hand, that work scales with the calendar rather than with the value of your judgement — and the ceiling arrives quietly, when the diary is full and the advisory layer you sold is squeezed into whatever is left of the month.
The constraint is not expertise. It is the hours between raw numbers and a defensible view of a client's next quarter, multiplied by the number of companies you look after.
What should you look for in fractional CFO software?
Six things separate software that supports a practice from software that becomes another job:
- One workspace per client, isolated by design. Ask how separation is enforced — at the data layer, or by file-naming discipline. Only one of those survives a busy month.
- Cross-module analysis, not single reports. If you ask about a hire, the answer should weigh cash, margin, cost base and forecast at once, the way a CFO thinks.
- Client-ready output. A brief an owner reads and acts on, not a spreadsheet they need you to narrate back to them.
- Reasoning shown. Every number should be defensible to the client and to their lender, with the factors behind it visible rather than asserted.
- Portfolio switching. Moving between companies in a click, with each one's context intact instead of re-briefing yourself every time.
- Economics built for advisers. Per-company or per-portfolio terms, rather than per-seat pricing that punishes you for growing the practice.
How do you keep client data separated?
Isolation has to be structural, not procedural — a folder convention is not a control. Put four questions to any provider: is separation enforced at the database layer or by convention? Who inside the workspace can open which company? Is client data encrypted in transit and at rest? And is it ever used to train models for other customers?
A provider who cannot answer those plainly is one to leave alone. Client money data is the whole basis of the relationship, and the answer should be short, specific and the same every time you ask.
What should a client-ready brief contain?
A board-grade brief is short: the variance worth explaining, the exposure behind it, two or three scenarios with the numbers attached, and the actions that follow, ranked by effort. What it should never be is a data dump with a commentary layered on top.
The test is whether the owner can make a decision from the first page — and whether the numbers survive a lender's questions without you in the room.
Where Oak fits
Oak is an AI CFO being built in London by Oakmont Kingsley Ltd, around the portfolio reality rather than the single-company view: many clients, one practitioner, and briefs that have to hold up outside the room they were written in.
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Common questions, answered plainly.
No, and the distinction matters. A portal is where clients read something you produced elsewhere. This category is the analysis layer of the practice itself — the reading, the scenarios, the brief — on your side of the relationship.
It should. This category works from the numbers you already keep — the client's ledger, cash position, invoices, headcount. Nothing should need replacing, and no rollout should need a migration project before you see a first brief.
Enough that switching between them takes a click rather than a login. If a provider cannot explain plainly how client data is separated, that is the first question to press them on.
Not the whole thing. Oak is pre-launch, and we are keeping the detail until it opens. Join the list and you will get the first look, plus early access when we go live.
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