A fractional CMO and a head of growth are not the same hire, and confusing them wastes money. One sets the strategy and owns the whole marketing function part-time. The other runs and optimizes execution, usually full-time. Hiring a head of growth when you actually need senior direction leaves you with fast experiments pointed in no particular direction.
I’m Andrii Byzov, a fractional CMO for B2B tech. Here is how the two roles differ and which one your company needs right now. If it is the former, my fractional CMO and hire a fractional CMO pages go deeper.
Key takeaways
- A fractional CMO sets strategy and owns the whole function, part-time.
- A head of growth runs execution and optimization, usually full-time.
- If you lack direction and a motion, the fractional CMO comes first.
- The fractional CMO often defines and hires the head of growth.
- They are complementary, not interchangeable.
The core difference
| Dimension | Fractional CMO | Head of Growth |
|---|---|---|
| Scope | Whole marketing function | Execution and optimization |
| Time | Part-time, senior | Usually full-time |
| Owns | Strategy, positioning, team, the number | Experiments, funnel, channels |
| Best when | No senior direction yet | Direction exists, needs running |
A head of growth thrives inside a defined strategy: experimentation, funnel work, often product-led levers. A fractional CMO creates that strategy and the motion in the first place, then builds the team to run it.
Which do you need first
If marketing is founder-led, growth is inconsistent, and there is no repeatable motion, you need senior direction before you need more execution. That is the fractional CMO case, and it is covered in when to hire a fractional CMO. If you already have sharp positioning, a working motion, and just need someone to optimize it full-time, a head of growth fits.
The common sequence is: a fractional CMO builds the motion, proves what works, then defines and hires the head of growth or first marketers to run it. You get strategy and the right next hire, instead of guessing.
The honest answer
Most early and growth-stage B2B SaaS companies that ask this question need the strategy and the system first, which points to a fractional CMO. But if direction is genuinely settled, do not pay for strategy you already have. For the agency comparison too, see fractional CMO vs marketing agency. I also write on LinkedIn.
FAQ
What is the difference between a fractional CMO and a head of growth? A fractional CMO is a part-time senior leader who sets strategy and owns the whole function. A head of growth is usually full-time and execution-focused on experiments and funnel optimization.
Do I need a fractional CMO or a head of growth first? If you lack senior strategy and a motion, a fractional CMO comes first. If direction exists and you need full-time execution, a head of growth fits.
Can a fractional CMO hire the head of growth? Yes. A common pattern is the fractional CMO building the motion, then defining, hiring, and mentoring the head of growth to run it.
Is a head of growth more junior than a CMO? Not junior, but narrower: execution and optimization within a strategy, versus owning the strategy, team, and number across the function.