Ask five people what a Chief Operating Officer does and you’ll likely get five different answers. Some will say “runs the business day-to-day.” Others will mention operations, logistics, or HR. The truth is the COO title covers a wider range of responsibilities than almost any other C-suite role, and what it means in practice depends heavily on the company, its sector, and who else sits around the boardroom table.
In UK businesses, the COO is typically the second-highest-ranking executive after the Chief Executive. Where the CEO sets strategy and represents the company externally, the COO is usually the person making sure the engine room actually runs: production, supply chains, IT systems, HR processes, and internal compliance often fall under their remit.
The Core Responsibilities
At most mid-sized and large UK organisations, a COO’s job centres on a handful of recurring areas.
Operational efficiency sits at the heart of it. This means overseeing how the company delivers its product or service, spotting where processes are slow or wasteful, and fixing them. A COO at a logistics firm might focus on warehouse throughput and delivery times. A COO at a fintech might spend more time on system uptime and regulatory reporting to the Financial Conduct Authority.
People and process management is another constant. Many COOs have HR, facilities, and internal IT reporting to them, particularly in companies where there’s no separate Chief People Officer. This isn’t glamorous work, but it’s often what determines whether a growing company holds together or starts to creak under its own weight.
Cross-functional coordination is where the role earns its reputation as the CEO’s right hand. When sales, marketing, finance, and product teams aren’t talking to each other properly, it’s frequently the COO who’s expected to sort it out. Sheryl Sandberg’s time as Facebook’s COO is often cited internationally as an example of this — she handled the business side so Mark Zuckerberg could focus on product.
Budget oversight also tends to land on the COO’s desk, though usually in partnership with the CFO rather than instead of them. In smaller companies without a dedicated CFO, some COOs absorb elements of the finance function too, which can blur the lines between the two roles considerably.
How the Role Differs by Company Size
A COO at a 15-person startup and a COO at a FTSE 250 company are doing genuinely different jobs, even though the title is identical.
At an early-stage business, the COO is often a generalist troubleshooter — one week they’re fixing a payroll issue, the next they’re negotiating with a supplier. There’s rarely a large team beneath them, so a lot of the work is hands-on.
At a larger, more established organisation, the role becomes more strategic and less operational in the literal sense. The COO manages heads of department rather than doing the work themselves, and a significant part of their time goes into planning, governance, and reporting to the board.
Some UK companies choose not to have a COO at all, particularly where the CEO prefers to retain direct oversight of operations, or where responsibilities are split across a CFO, CPO, and CTO instead. There’s no legal requirement under the Companies Act 2006 to appoint one — it’s purely a matter of organisational design.
Pay and How It Varies
COO pay in the UK varies enormously by sector, company size, and location. Data from Glassdoor puts the UK-wide average base salary at roughly £137,000, though ranges swing widely depending on the source and sample used, with London roles generally sitting well above the national figure. Recruitment specialists report that in banking, private equity, and hedge funds, total packages can climb into the hundreds of thousands once bonus and long-term incentives are included, while COOs at smaller commerce and industry businesses tend to sit closer to the lower end of that scale.
Increasingly, smaller UK businesses are hiring COOs on a fractional or part-time basis — typically one to three days a week — rather than committing to a full-time salary. This has become a genuinely popular route for scale-ups that need senior operational leadership but aren’t yet at the size where a full-time hire makes financial sense.
The Practical Takeaway
If you’re hiring for this role, resist the temptation to copy a generic job description. Write down the three or four things your business actually struggles to keep on top of — supply chain, people management, systems, cross-team communication — and build the COO brief around those gaps specifically. The title means very little on its own; it’s the mandate behind it that determines whether the hire succeeds.