When should a Series B tech company hire a fractional CMO?

Three patterns that tell you it is time

The three patterns that indicate a UK scale-up needs a fractional CMO are: a CEO still running marketing, a product-led founder with no route to customers, and a CRO hire that has hit a ceiling. Most founders do not frame it this way. They say "marketing is not working" or "we need to figure out our story." But when you sit with them long enough, the same three patterns emerge, and they are distinct enough to be worth examining separately.

Pattern one: the CEO who cannot let go of marketing

This happens most often when someone with a marketing background finds themselves in a leadership role. They are good at marketing. Often very good. And that is precisely the problem.

They stay involved in every campaign, every piece of copy, every brand decision — not because the work requires it, but because it is more comfortable than the actual job of running a business. The marketing feels tangible. Board governance, resource allocation, investor relations: those feel abstract by comparison. So the marketing gets their attention, and the business drifts.

When a fractional CMO comes into this environment, there is tension. The CEO may disagree with specific decisions. They have opinions — legitimate ones — about messaging, about how the market should see the company, about how the brand should feel. That tension, handled well on both sides, produces better outcomes than either person would reach alone. The CEO brings institutional knowledge and commercial instinct. The CMO brings operational discipline and a view of the market that is not filtered through the lens of the last board meeting.

But the two roles are fundamentally different jobs. The CMO drives the front end of the business: the story you tell the market, qualified conversations with buyers, reputation, market intelligence. The CEO allocates resources across departments and ensures the long-term health of the organisation. You cannot do both. Not at Series B, when the stakes are real and the runway is finite.

A good fractional CMO also plays a sensory role that the CEO simply should not have time for. Reading the competitive signals. Understanding what is shifting in the wider market. Identifying opportunities for growth that are not obvious from inside the building. That is one of the key drivers of the requirement, and it is the piece that disappears when the CEO tries to wear both hats.

Pattern two: the technologist founder and the field of dreams

Technology companies are usually founded by technologists. That stands to reason. The product exists because someone brilliant built it.

The dangerous assumption is that building something extraordinary is the same as building a business around it. "If you build it, they will come." And yes, there are exceptions — products where virality is embedded in the mechanism itself, like Facebook with its friend requests or the way apps spread through TikTok. These are genuinely exceptional cases. For most B2B technology companies, nobody comes unless you go and get them.

Translating what an organisation does into repeatable, high-quality paying customers is a specific discipline. It requires insight into the market, the buyer, the competitive frame, and the story that ties all of it together. What typically exists when there is no marketing leader is a collection of fragments: the CEO's personal blog, a junior person posting on Hacker News, a pitch deck that was written for investors and is now being repurposed for customers, a website that describes what the product does but never explains why anyone should care.

A fractional CMO takes those fragments and builds the story that resonates with the market. They build the systems. They hire the people — or, increasingly, the pieces of people — that make the function work. As AI tools become more capable, more of the production work can be handled with fewer hands. But the taste and judgment that drive high-quality outcomes matter more now than they did five years ago. The machines can produce at volume. Someone still needs to decide what is worth saying and who needs to hear it.

Pattern three: CRO vs CMO — the default hire and what it misses

In the last few years, a lot of scale-ups defaulted to hiring a Chief Revenue Officer instead of a CMO. The CRO is an important role, and this is not in any way a criticism of it. But by its nature, it focuses on short-term new business and driving increased revenue from existing customers — often through programmes that run across departments: deploying retention initiatives with the technology team, working with the marketing function (sometimes privately referred to as the "department of colouring in") to get collateral out the door.

What this structure misses is the strategic role of marketing. A clear story about why you matter, told in the right places. Channel selection that optimises for both efficiency and effectiveness. And reputation — the long-term brand growth that does not appear in weekly dashboards but absolutely shows up in the ones that span quarters and years.

Companies in the rapid scaling phase — typically year two of a five-year venture fund deployment, or entrepreneurs building scale to exit before the market turns — have tended to see the CRO as the answer. This pattern is common enough to be predictable: the revenue mechanisms flatline or produce diminishing returns, and nobody on the leadership team can explain why.

Here is why. As the cost of content production drops toward zero (and with AI, it is dropping fast), availability in the mind of the buyer becomes the differentiator. Think about how many yoghurt brands you can name. Probably three or four. There are likely ten on the supermarket shelf. In a grocery aisle, you might still pick one up by accident. But in B2B, nobody ends up on a shortlist by chance. You have to be present in the mind of the buyer before they ever begin looking.

Being present means knowing specifically who your buyers are, where they pay attention, and how to build a reputation that makes you the obvious choice when the need arises. These are not things that sit in the CRO's remit. They are not CRM functions. They are marketing strategy, and they require someone senior enough to own them.

What a fractional CMO actually does

A fractional CMO is an embedded, part-time marketing executive who sits on your leadership team — typically two to three days a week — and owns your story, your team, and the numbers that connect marketing activity to revenue. They are not a consultant. And they are not a new head of marketing. The distinction matters. A head of marketing — even a capable one — can execute a plan you hand them. A fractional CMO decides whether you need a different plan entirely, and has the seniority to move the organisation, its board, and its story onto a different set of tracks.

Here is the distinction that matters for every company considering this. If all you need is to do the same thing you are doing now, but faster, you probably do not need a fractional CMO. You need to work out how to deploy AI effectively, increase your production speed, and have people with genuinely good taste ensure that everything going out the door meets a high standard. That is an operational problem with operational solutions.

But if you need to be heading in a different direction — letting the market see that you are special in a way they have not grasped yet — that is a story problem. Positioning — the answer to "why should anyone pick you?" — is what a fractional CMO does.

In practice: they sit in your leadership meetings, build or fix how the market sees you, hire and manage your marketing team, own the numbers that connect activity to revenue, and hold the story together across sales, product, and investor relations. Typically two or three days a week, in your Slack, on your calls, accountable for commercial outcomes.

What they do not do: execute every campaign, replace your content team, or run your paid media. A fractional CMO is a strategic leader who builds the function. A good one will roll up their sleeves in the early months, but the goal is always to build a team and a system that works without them.

One thing to watch for. If someone walks into your first conversation with all the answers, they have not listened enough. Every brief is different. It takes time to get into the skin of a business before you can make things happen. The CMO who impresses you on day one with a ready-made plan should worry you more than the one who spends the first fortnight asking questions that make you uncomfortable.

One caveat that is worth stating plainly: a fractional CMO needs people who can deliver the work. If you have no execution capacity — no in-house marketers, no agency relationships, nobody who can actually produce campaigns and content — then a fractional CMO will give you a brilliant strategy that gathers dust. The model works when there is a team (even a small one) that needs direction, or when the CMO is empowered to hire that team as part of the engagement.

Sometimes a short fractional engagement is all that is needed: set up the systems, build the processes, hire one or two good people, and hand it over. Other times it is something broader — repositioning the company, changing the narrative, putting you onto different tracks altogether. The scope depends on what the business actually needs, not on what the fractional CMO's standard engagement looks like.

The XTCC example

XTCC was building a trustless carbon credit verification system with strong technology and no route to market. No marketing function, no story that landed with buyers, no clear path to the institutional investors who needed to hear it.

Through a 90-day fractional engagement, XTCC repositioned from a technical platform to a climate finance instrument designed for sovereign wealth funds. The same technology, reframed for a different buyer at a different price point. The result: a $6B pipeline of sovereign wealth fund commitments, a "Best Innovation" award at COP28, Financial Times coverage, and a path to Deutsche Borse listing. Ninety days from brief to launch.

That is what a fractional engagement looks like when the product is strong and the story is wrong. You can read more about how Fifty Six Partners works with companies at this stage.

Fractional CMO vs full-time CMO: when each makes sense

The honest answer is that most Series B companies do not need a full-time CMO.

A full-time hire makes sense when you have a proven, repeatable route to customers and enough marketing activity — team, budget, channels — to justify a dedicated senior leader five days a week. For most UK tech companies, that is somewhere around £15–20M ARR, though it varies with the complexity of your sales motion and the size of your existing team.

Below that threshold, a full-time CMO hire is a gamble. The salary is typically £180–250K base, plus equity, plus a recruiter fee. The onboarding takes months. And if you get the hire wrong — the data suggests 42% of full-time CMO hires are considered unsuccessful within 18 months — you have lost six to nine months of momentum and a significant portion of your runway. Full-time CMO tenure in tech companies averages just 28 months. That is barely enough time to build a function, let alone see the results compound.

A fractional CMO de-risks this. Senior strategic leadership from week one, at roughly 40–60% of the all-in cost, with the flexibility to scale up or down as the business requires. And a good fractional CMO will help you hire their own replacement when the time is right. They will know exactly what the role needs, because they have been doing it.

	Fractional CMO	Full-time CMO
Annual cost (UK)	£190–500K	£250–350K all-in
Time to start	1–2 weeks	3–6 months (notice + onboarding)
Commitment	2–3 days/week, flexible	Full-time, permanent contract
Risk if wrong fit	End the engagement	6–9 months lost + severance
Best for	£3–15M ARR, building the function	£15M+ ARR, scaling a proven engine
Avg tenure	71 months (fractional engagements)	28 months (tech companies)

How much does a fractional CMO cost in the UK?

The fractional CMO cost in the UK ranges from £2,000 to £3,500 per day for someone with genuine C-suite experience — not a freelance marketing manager with a new LinkedIn title. At two to three days per week, that works out to roughly £16,000 to £42,000 per month.

Compare that to a full-time CMO: £180–250K salary, 25–30% on top for National Insurance and benefits, plus a recruiter fee of 20–25% of first-year compensation. You are looking at £250–350K all-in for year one, before they have delivered a single thing. And they cannot start for three months because they are serving their notice period.

For a company burning £500K–1M per month — which is the reality for most Series B businesses filing at Companies House — that difference is material.

The bottom line

If you have product-market fit, revenue that is growing, and no one senior enough to build the engine that finds and wins customers — that is the moment. Not when everything is on fire. Not when you have already missed a quarter. The earlier you bring in strategic marketing leadership, the less you spend fixing mistakes that did not need to happen.

And if you recognise one of those three patterns — the CEO doing two jobs, the brilliant product that is not selling itself, or the CRO function that has hit a ceiling — the answer is rarely "hire a full-time CMO right now." For most UK scale-ups, the right Series B marketing leadership model is experienced, embedded, part-time — someone who works out which tracks you should be on and builds the function to get you there.

For a reading list that covers the foundations, see ten resources every first-time Series B marketing leader needs. For examples of how UK tech companies have handled this, see ten UK tech growth playbooks.