What a Series B board expects of finance
A Series A board wants to know the company will not run out of money by accident. A Series B board wants to know the business model works and can be described in numbers somebody else could audit. That is a different finance function, and it is the point at which a fractional seat most often stops being the right shape.
The artefacts, specifically
At this stage the board is no longer reading a summary. It expects a small set of documents that exist continuously rather than being assembled the week before a meeting, and it expects them to reconcile with each other.
- A three-statement model that ties, updated monthly rather than rebuilt quarterly
- Cohort retention and contribution margin by cohort, not blended averages
- A rolling thirteen-week cash view, separate from the annual plan
- Revenue recognition that an auditor would accept without a rewrite
- A headcount plan costed fully loaded, not on base salary
Audit readiness arrives before the audit does
Most companies meet their first proper audit somewhere around Series B or the year after, and the cost of being unready is not the audit fee. It is a restatement of numbers the board has already seen, which damages trust in every figure presented since. Getting the revenue recognition policy right while the volume is small is cheap; doing it retrospectively across two years is not.
Where the fractional shape stops fitting
A Series B finance function usually has a team: someone doing the bookkeeping, someone owning payroll and someone building the reporting. Once a function has people in it who need managing daily, a part-time leader becomes a bottleneck rather than a saving. The work also shifts from building things to running them, and running a function is a volume job.
What fractional is still genuinely good for here
Two things, both finite. Preparing the function for the raise, which means getting the model, the cohort view and the data room into a state that survives diligence. And covering the gap between an outgoing finance lead and a permanent replacement, which at this size is an interim engagement rather than an ongoing fractional one.
The honest version
If this page describes your company, the answer is probably a permanent finance leader and the fractional route is a bridge to it rather than an alternative. Saying so costs this site the larger engagement, and saying the opposite would cost a company a year. A full-time appointment is a service sold here too, priced openly, and the comparison is set out on the cost calculator rather than argued.
The seats this usually comes down to
Common questions
Does a Series B company need a full-time CFO?
Usually yes, or a full-time finance director with a fractional CFO above them. The test is not revenue, it is whether the function has a team that needs managing daily and whether the work has shifted from building reporting to running it. Both of those arrive before the revenue number people quote as the threshold.
What financial reporting does a Series B board expect?
A three-statement model updated monthly and reconciling to the accounts, cohort retention and contribution margin by cohort rather than blended, a rolling thirteen-week cash view separate from the annual plan, revenue recognition an auditor would accept, and a fully loaded headcount plan. The distinguishing feature is that these exist continuously rather than being assembled before each meeting.
When should a company prepare for its first audit?
Before it is required, because the expensive part is not the audit fee but restating figures the board has already been shown. Settling the revenue recognition policy while volumes are small is inexpensive. Doing it retrospectively across two years of history, during a raise, is where the cost and the credibility damage sit.
Can a fractional CFO take a company through a Series B raise?
Frequently yes, and this is one of the strongest cases for the seat. Raise preparation is finite, senior, project-shaped work: the model, the cohort analysis, the data room and the diligence responses. What usually does not work is the same person running the finance function day to day afterwards, which is a different job with different hours.
Browse it yourself, or hand over the brief
Browse the bench and approach an operator directly at no cost, with the day rate on the profile before the conversation starts. Operator Search runs it instead: three researched candidates against a written brief in five business days. If the seat turns out to be permanent, full-time search is priced on the page.