Series A Businesses Don’t Need a CMO. Here’s What They Actually Need.

Hiring a CMO too early is one of the most expensive mistakes a Series A business can make. Not because CMOs are bad. Because a CMO hired before the go-to-market motion is proven will spend their first six months figuring out what you should have figured out at Seed — and you'll pay them £180k–£220k a year plus equity to do it.

At Series A, the marketing problem is usually not a leadership problem. It's a clarity problem. Unclear ICP, unproven positioning, a channel mix that hasn't found its primary engine. Hiring a CMO into that environment creates a dangerous dynamic: the CMO feels pressure to deliver fast, makes strategic calls before the diagnostic is done, and either gets fired at 12 months or stays and optimises the wrong thing for two years.

What Series A businesses typically need is senior marketing judgment applied to the right questions — not a full-time executive committed to building an empire. That's a different hire. This post makes the case for doing it differently.

What a CMO Actually Does vs. What Series A Needs

A CMO builds and leads a marketing function. They're an executive hire: responsible for a team, a significant budget, a brand, a strategy, and a commercial number. They create infrastructure, manage senior specialists, and represent marketing at board level. All of this is the right answer for a business with a proven acquisition motion that needs to scale it, a team of five or more marketing headcount that needs leadership, and revenue that justifies a significant senior hire.

None of this is what most Series A businesses need. What they need is: a proven acquisition channel with known unit economics, clear ICP definition that the whole commercial team agrees on, positioning that converts with target buyers, and a measurement setup that tells them what's working. These are diagnostic and foundational tasks. They require judgment and experience — but they don't require a full-time executive building a function around them.

The mismatch is expensive. A CMO tasked with foundational work is overqualified for what they're actually doing, underutilised for what they were hired for, and expensive for both. When the match is wrong, the median tenure for a Series A CMO is 14–18 months — short enough that the real cost is the 12 months of misaligned strategy that preceded the departure.

The Cost of Hiring Too Early

Full-time CMO cost at Series A level: £180k–£220k base, plus meaningful equity (0.3–0.7% is typical), plus on-costs, plus the cost of the team they'll hire. Annual total cost including one direct hire and agency relationships is £350k–£600k in the first year. For a Series A business with £5–8M raised, this is a significant commitment.

The opportunity cost is more significant than the cash cost. A CMO hired before the marketing foundations are in place will optimise the wrong motion. They'll hire for the strategy they believe in, not the strategy the business actually needs. When the CMO leaves at 18 months and the strategy needs rebuilding, the business has paid £500k+ to end up roughly where it started — except now the team has had 18 months of misaligned direction.

The alternative: the same budget deployed differently buys two to three years of fractional CMO engagement, a strong content/SEO resource, and a paid specialist — with better strategic output, more flexibility, and no equity dilution. The economics are not close.

What Series A Actually Needs From Marketing

ICP validation: if the Seed ICP hypothesis was based on who you thought you were building for rather than who is actually closing and sticking, it needs revalidating before Series A marketing spend is committed. The wrong ICP means the wrong content, the wrong channel, and the wrong sales narrative. Fixing it at Series A before scaling spend is worth weeks of diagnostic work.

Channel proof: one acquisition channel with proven unit economics — a CPL, a conversion rate, a CAC, and a payback period that make sense. Not four channels with some activity on each. One channel that you can scale with confidence because you understand what drives its performance. This is what a Series A investor is evaluating when they ask about your go-to-market.

Positioning that differentiates: a message that your ICP finds credible and differentiated from funded competitors. Not your founding story, not your feature list — a clear statement of what you do, who for, and why you're the right choice over the alternatives. This probably needs to be tested with real buyers before the Series B preparation starts. Positioning that was written at Seed often doesn't survive contact with a better-funded competitive landscape.

The Fractional CMO as a Stage-Appropriate Alternative

What a fractional CMO gives you at Series A: senior marketing judgment without the equity burn, typically 2–3 days per week on a 30-day rolling contract. A diagnostic-first approach that doesn't commit to a strategy before understanding the business. Flexibility to increase scope if needed and exit cleanly if the relationship isn't right. No equity, no headcount, no long-term commitment before you've established whether the approach is working.

What you don't get: full-time bandwidth. A single person who's available at any moment and fully immersed in the business. The symbolic credibility of a full-time CMO on the deck for investor conversations (though this matters less than most founders think — investors care about results, not titles).

The honest trade-off: fractional gives you better strategic output at lower cost for the diagnostic and foundational phase. Full-time gives you more presence and ownership once the foundation is built. Most Series A businesses are in the diagnostic and foundational phase. Very few are ready for a full-time CMO.

When to Hire the Full-Time CMO

The signals that indicate a full-time CMO is the right call: one acquisition channel proven at scale with known unit economics (not just promising — proven), a marketing team of five or more people that needs genuine management and development, a Series B preparation process where a credible CMO on the deck matters to the investors in the process, and revenue at a level where the fully-loaded cost of the hire is clearly ROI-positive at current conversion rates.

Before those signals exist, the full-time hire is premature. The test: if the CMO you're about to hire spent their first six months building foundations rather than scaling a proven motion, is that the right use of the hire? If yes, a fractional CMO is a better choice. If the motion is proven and the CMO's job is to scale it and build the team that does so, full-time is right.

The transition from fractional to full-time is a natural one: the fractional CMO builds the foundations, proves the primary channel, and by the end of the engagement has defined what the full-time CMO role should look like. The handover is cleaner and the full-time hire has a running start rather than inheriting ambiguity.

The Alternative Build: Fractional CMO + Specialist Execution

In practice, this looks like: fractional CMO for 2–3 days per week at £800/day (£8–10k/month), one content and SEO resource at £3–5k/month, one paid media specialist at £4–6k/month. Total annual cost: £80–120k, no equity. The fractional CMO owns strategy and oversight. The content resource owns the organic programme. The paid specialist executes the paid channel.

This model produces senior strategic judgment at the right stage, specialist execution in the two channels that matter most for early Series A growth, and flexibility to change any component when the business needs change. Compare this to the fully-loaded cost of a full-time CMO plus one specialist hire: £400–600k in year one, with equity committed and a headcount structure that's expensive to unwind.

The alternative build is not a compromise. It's the right commercial decision for a business that hasn't yet earned the need for a full-time marketing executive. The founders who make this decision are the ones who avoid the most expensive common mistake at Series A.

If you're at Series A and the board is asking when you're hiring a CMO — it's worth pressure-testing whether that's actually the right question. The right question might be: what does your marketing need to look like in 12 months to get you Series B-ready? I help founders answer that. Let's talk.

Related: what a fractional CMO costs and does | how fractional CMOs build predictable revenue | onboarding a fractional CMO the right way