5 Best Fractional Marketing Experts for B2B Companies in the UK

B2B buying decisions rarely rest with one person. Gartner's research puts the average buying group at five to 16 people across four functions. That's a lot of stakeholders for one junior marketer to convince alone.

A full-time CMO is one answer. But that's a six-figure hire before you know which channels will actually move pipeline. A fractional marketing expert gives you that same senior judgement, priced by the day or month instead of the year.

The model is spreading fast. The Institute of Interim Management ran its first dedicated look at fractional working in its 2026 survey. It found roughly one in four assignments are now delivered this way.

This post compares five fractional marketing experts serving B2B companies in the UK. Use it to shortlist the right fit for your stage and budget.

Fractional marketing experts for B2B companies, compared

Growth Division runs channel-agnostic fractional growth teams for B2B tech startups, built around its own GREX operating system. ToJupiter embeds as a demand generation team inside B2B SaaS companies, with a strong lean toward account-based marketing.

Octogamma places fractional CMOs into fintech, AI, and blockchain businesses with an AI-accelerated delivery model. Open Velocity builds marketing strategy and fractional CMO support for companies that need commercial clarity before committing budget. Dependopolis pairs fractional CMO leadership with brand and digital transformation work for larger B2B projects.

1. Growth Division: Fractional Growth Teams Built for B2B Startups

Disclosure: Growth Division is our agency. We think it earns its place on this list, but we're not going to pretend we're neutral about it.

Growth Division, our growth marketing agency, builds fractional growth teams for B2B tech startups. You get a Growth Strategist who runs the process. Plus channel specialists who rotate in based on what the experiments show.

Most fractional marketing arrangements hand you an expert without a clear system around them. Growth Division's answer is GREX, our AI growth operating system that tracks experiments and coordinates the team. The whole approach is built on the Bullseye Framework, a structured GTM process every engagement starts with.

The majority of Growth Division's B2B clients are tech startups navigating complex, multi-stakeholder sales cycles. That's exactly the environment Gartner's buying-group research describes, where a channel-agnostic strategist matters more than a single specialist. You can read more about how the model works on our fractional marketing services page.

Where they focus

Growth Division's Growth Strategist sits above the channel work, deciding what to test next based on data, not preference. Channel experts, paid media, content, SEO, and email, are swapped in and out as results come in.

GREX runs underneath all of it, tracking experiment results and flagging what's working. The Bullseye Call kicks off every engagement, mapping go-to-market strategy before a penny of budget moves.

Strengths and trade-offs

The channel-agnostic model is the clearest advantage. Nobody on the team has a reason to recommend PPC over content just because that's what they sell.

The expert network is vetted over years, not sourced cold from a freelance platform. GREX gives visibility into experiments without spreadsheet overhead.

The trade-off is fit. Growth Division isn't built for companies still hunting for product-market fit. The monthly retainer model doesn't suit one-off projects either.

The investment

A full fractional growth team typically runs £5,000 to £10,000 a month. A standalone Growth Strategist costs £2,000 to £3,000 a month, and individual channel experts start around £1,000 a month each.

On their client list

Growth Division has worked with over 130 startups across the UK, US, and Europe. Musiversal grew from $100,000 to $1.2 million in ARR within 12 months. Eat Sleep Cycle added €1 million in extra sales in six months.

Weavr generated 175+ MQLs from a standing start, and Unlock closed 14 new customers in its first three months. Growth Division holds a Clutch rating of 4.7 out of 5 across 31+ verified reviews.

2. ToJupiter: Embedded Demand Generation for B2B SaaS

ToJupiter is a London agency, founded in 2024, that embeds inside B2B SaaS companies as a demand generation team. Rather than a single fractional CMO, you get a small, fast-moving unit. It covers paid media, account-based marketing, and lead-gen infrastructure.

The pitch is speed. Client reviews describe quick wins landing within the first week, with a repeatable growth playbook forming by month six. That cadence suits founders who need proof the model works before committing budget for longer.

Their service mix leans heavily on advertising and account-based marketing. Fractional CMO advisory sits on top, rather than being the core offer.

That makes them a better fit for companies that already know they need paid pipeline fast. It suits them more than founders still deciding on channel strategy.

Where they focus

ToJupiter tightens up your existing marketing stack first, often reworking HubSpot or CRM setups clients found bloated. From there, they run paid and account-based campaigns against a defined budget. They work directly alongside your sales team on target accounts.

Lead-generation webinars and events sit alongside the paid work, aimed at building pipeline that sales can act on immediately.

Strengths and trade-offs

Clients on Clutch highlight the speed of setup and the strategic thinking behind campaigns, not just execution. One reported a 300% increase in ROAS, another a 40% reduction in HubSpot-related costs.

Some reviews mention early-stage disorganisation before the engagement settles into rhythm. As a two-to-nine-person team founded in 2024, capacity for very large, multi-market programmes is naturally limited.

The investment

ToJupiter's minimum project size starts around $5,000, with an hourly rate of $100 to $149. Most engagements reviewed fell in the $10,000 to $49,999 range.

On their client list

ToJupiter's published case studies span a supply chain technology company, a software business, a gaming company, and an SEO consultancy. Reviewers cite a 50% increase in revenue and improved pipeline creation as recurring outcomes. The agency holds a 4.9 out of 5 rating on Clutch from four verified reviews.

3. Octogamma: Fractional CMOs for Fintech, AI, and Blockchain

Octogamma is a London-based consultancy, founded in 2021, that places fractional CMOs specifically into fintech, AI, and blockchain companies. Half of their service line is fractional CMO work. AI consulting and blockchain marketing make up much of the rest.

What sets them apart is how they use AI internally. Octogamma claims their AI-driven workflow saves up to 80% of typical delivery time. That efficiency shows up in lower hourly rates than most fractional CMO providers here.

That efficiency doesn't seem to come at the cost of quality. Octogamma holds a perfect 5.0 rating across 11 verified reviews. That's an unusually high volume of five-star feedback for a boutique consultancy.

Where they focus

Octogamma's fractional CMOs typically arrive to build or fix marketing strategy from the ground up. Reviews describe engagements spanning positioning, SEO strategy, content development, and go-to-market planning for complex, technical products.

Clients specifically praise the team's ability to grasp difficult product categories fast. One reviewer noted a team member's ability to understand a complex product almost immediately.

Strengths and trade-offs

The combination of deep vertical focus and AI-accelerated delivery is genuinely differentiated. Reviewers repeatedly mention clear, actionable strategy rather than vague recommendations.

The narrower industry focus, fintech, AI, and blockchain specifically, means Octogamma is a weaker fit outside those verticals. Their Clutch profile shows most projects under $10,000, suggesting leaner scopes than agency-style retainers.

The investment

Octogamma's minimum project size is $5,000, with an hourly rate of $50 to $99. That's among the most accessible pricing on this list. Most reviewed projects came in under $10,000.

On their client list

Octogamma has delivered fractional CMO and marketing strategy work for a blockchain analytics firm and a payment solutions company. Their client list also includes a financial consulting business and a telecom provider. Clients report consistent five-star feedback and repeat, ongoing relationships.

4. Open Velocity: Marketing Strategy Before Marketing Spend

Open Velocity is a York-based consultancy, founded in 2022. Its idea is simple: understand the commercial problem before recommending a channel. Fractional CMO work sits alongside digital strategy, marketing strategy, and business consulting as one connected offer.

Their language is deliberately unglamorous. The team describes turning "performance ambiguity" into decisions organisations can act on. In practice, that means marketing audits and strategy documents before any campaign begins.

That approach suits B2B companies who've tried agencies before. Too often, the recommendations felt disconnected from how the business actually operates. Open Velocity's model fits the strategy to the company, not the other way round.

Where they focus

A typical engagement starts with a marketing audit, a structured review of what's working, what isn't, and why. From there, Open Velocity builds a marketing or digital strategy document the client's team can act on directly.

Fractional CMO support extends that strategy work further. It embeds for ongoing execution oversight, rather than one-off consulting.

Strengths and trade-offs

Reviewers consistently praise Open Velocity's project management and their ability to read a client's specific market conditions. Thorough market research is a recurring theme across their Clutch reviews.

One client noted that deliverables could be articulated more clearly upfront, and that recommendations could be pushed more forcefully. As a two-to-nine-person team, they're better suited to strategy and leadership than large-scale execution.

The investment

Open Velocity's minimum project size is $5,000, with an hourly rate of $150 to $199. Most reviewed projects fell between $10,000 and $49,999.

On their client list

Open Velocity has delivered marketing training for an e-commerce development company. They also paired a marketing audit with fractional CMO services for a systems integrator. The agency holds a 4.9 out of 5 rating across 12 verified Clutch reviews.

5. Dependopolis: Fractional CMO Leadership Plus Brand Transformation

Dependopolis operates from London and Dubai, founded in 2021 by Shebin Hassan. Their offer sits at the intersection of fractional CMO leadership, brand strategy, and digital transformation. That makes them the most expensive, and most broadly scoped, option here.

Unlike the other four experts here, Dependopolis bundles marketing leadership with technology work. IT infrastructure, digital transformation, and systems integration sit alongside the marketing brief. That's a meaningful difference for B2B companies whose marketing and martech problems are tangled together.

The minimum project size, $25,000, reflects that broader scope. This is a fit for established B2B companies with a real transformation project, not early-stage startups testing their first channels.

Where they focus

Dependopolis's fractional CMO work typically starts with brand strategy and integrated marketing planning. From there, the team layers in the technology side. That covers CRM systems, IT infrastructure, and digital experience work supporting the strategy.

Reviews describe engagements spanning branding, PR, and web development, all delivered by the same core team. That reduces the number of vendors a client has to coordinate.

Strengths and trade-offs

Clients consistently highlight Dependopolis's attention to detail and their preference for sustainable outcomes over quick fixes. Their Clutch profile shows a perfect 5.0 rating across three reviews. Agile project management tools come up as a specific strength.

That commitment to thoroughness sometimes extends timelines, a trade-off several reviewers flagged directly. The $25,000 minimum project size also puts Dependopolis out of reach for smaller B2B companies still validating their marketing approach.

The investment

Dependopolis's minimum project size is $25,000, the highest on this list, with an hourly rate of $50 to $99. Most reviewed projects were smaller, sitting under $10,000, suggesting flexibility once a broader relationship is established.

On their client list

Dependopolis has delivered branding, marketing strategy, and PR for a food and ice cream supplies company. They've also handled web development and IT infrastructure for a property management business. Reviewers describe improved customer retention and website traffic as measurable results.

Frequently asked questions

What does a fractional marketing expert actually do for a B2B company?

A fractional marketing expert takes on senior marketing responsibility, strategy, positioning, or channel leadership, on a part-time or project basis. For B2B companies, that usually means untangling a complex buyer journey and building a repeatable pipeline process.

Some, like Growth Division and ToJupiter, embed as a full team covering strategy and execution together. Others, like Open Velocity, focus purely on strategy and leave execution to your in-house team or another vendor.

How much does a fractional marketing expert cost in the UK?

Pricing on this list ranges from $5,000 minimum project size up to $25,000 and beyond for broader transformation work. Monthly retainers for a fractional growth team typically run £5,000 to £10,000. A standalone fractional CMO retainer often starts around £4,000 a month.

The full-time hire cost comparison is worth doing early. A senior in-house marketing hire in the UK typically costs £80,000 to £115,000 a year before any campaign spend.

Should a B2B company choose a fractional CMO or a fractional growth team?

A fractional CMO alone gives you strategic leadership without execution capacity. That's the right fit if your internal team just needs direction. It's closer to what Open Velocity and Dependopolis offer.

A fractional growth team, like Growth Division or ToJupiter, gives you both strategy and hands-on execution in one engagement. That suits B2B companies with no internal marketing capacity yet.

How do I know if a fractional marketing expert is genuinely senior?

Ask for a specific example: a channel that didn't work, and what they changed as a result. Genuinely senior operators can walk through that decision in detail.

Check their reviews for repeat engagements, not just one-off praise. A client who extends the relationship is a stronger signal than a single five-star review.

Can a fractional marketing expert replace a full-time hire entirely?

For most B2B companies at seed to Series B stage, yes. That holds true at least until the function needs full-time headcount to manage it. The flexibility cuts both ways: you can scale down as easily as you scaled up.

Beyond a certain size, most companies transition to a full-time senior hire. Many use the fractional period to define exactly what that role should cover.

What's the difference between B2B and B2C fractional marketing expertise?

B2B marketing deals with longer sales cycles and buying groups that Gartner puts at five to 16 people. That complexity rewards experts who understand account-based approaches and multi-stakeholder messaging, not just top-of-funnel volume.

B2C experts tend to specialise in paid acquisition and conversion rate optimisation instead. All five experts here work primarily, or exclusively, in B2B growth marketing. That's exactly why they made the cut.

Conclusion: Match the expert to your stage, not just the price

The cheapest option isn't always the right one, and neither is the most expensive. What matters is matching the model to where your B2B company actually is.

Growth Division fits B2B tech startups wanting a full fractional team with channel-agnostic strategy behind it. ToJupiter fits SaaS companies that already know they need demand generation built fast.

Octogamma fits fintech, AI, and blockchain B2B firms wanting deep vertical fluency at accessible rates. Open Velocity fits companies that want strategic clarity before spending a pound on execution. Dependopolis fits larger B2B businesses with a genuine brand and technology transformation ahead of them.

If you're still weighing fractional against a full-time hire, start with a Bullseye Call to map your go-to-market strategy first. It's a structured conversation, not a sales pitch, and it'll clarify what kind of expert your business actually needs.

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