What a fractional CDO actually is

A fractional CDO is a Chief Data Officer engaged on a part time, ongoing basis. The word fractional describes the commitment, not the seniority: you get someone who has held the title or done the work at scale, but you pay for a fraction of their week rather than a permanent salary, bonus, pension and equity package. The remit is the same as a full time CDO. They set the data strategy, decide how data is governed, make sure it is trustworthy, and connect it to commercial decisions. The difference is that a mid market business rarely needs that input five days a week, so a fractional arrangement gives you the seniority at a cost and cadence that fits the size of the problem. It is the same logic behind a fractional CIO and CISO: buy the judgement, not the headcount.

What a fractional CDO does week to week

The job is to turn data from a cost and a liability into an asset the board can rely on. In practice a fractional CDO writes the data strategy and ties it to business outcomes, then builds the governance that makes the strategy real: ownership, quality standards, definitions everyone agrees on, and clear rules for who can use what. They sort out where data lives and how it moves, so reporting stops contradicting itself and people trust the numbers. They set the policy for how data is handled under UK GDPR, which sits close to the privacy and security work covered in cyber security consulting. And increasingly they own the data foundations that any serious analytics or AI programme depends on, which is where the role overlaps with AI governance.

• Set a data strategy that maps to commercial priorities, not a technology wish list.
• Establish governance: data ownership, quality, definitions, access and lineage.
• Make reporting trustworthy so the board stops arguing about whose number is right.
• Own data protection and responsible use, including the foundations AI relies on.
• Build the team or partners, then hand over a function that runs without them.

When a business needs one

You usually feel the need before you can name it. Reports from different teams disagree. Nobody owns a definition as basic as an active customer. A private equity owner wants a data backed view of the business and the spreadsheets cannot answer. You want to use AI but your data is too messy to trust the output. Or a deal, a new system or a regulator has forced data quality onto the board agenda for the first time. A fractional CDO is the right answer when the data problem is genuinely senior, demanding strategy and authority, but does not yet justify a permanent six figure hire. That is the same gap a business hits with technology leadership, which is why so many turn to an interim approach to fill a leadership gap rather than rush a permanent appointment.

How it differs from a full time CDO

A full time CDO is a permanent executive on the payroll. They make sense when data is core to how the company makes money and the work is constant: a large bank, a data led platform, a business where the data team runs to dozens of people. A fractional CDO suits the much larger group of organisations where data matters a great deal but the leadership demand is periodic. You get the same calibre of person and the same authority at the board, scaled to a few days a month. When the function matures or the workload grows past what fractional can carry, a good fractional CDO will tell you it is time to hire permanently and help you do it. You can see how that day rate compares to a permanent package using the cost calculator, and the same trade off is set out on the pricing page.

How it differs from a CIO, a CISO and a data engineer

These roles are routinely confused because the lines genuinely blur in a smaller business. A CIO owns technology and how the organisation runs on it, the territory of IT strategy consulting and the broader virtual CIO remit. A CISO owns security and the protection of information, delivered through CISO as a service or a virtual CISO. A data engineer builds the pipelines. A CDO owns the value, meaning and trustworthiness of the data itself: what it means, whether it can be relied on, and what the business is allowed to do with it. The CDO decides the data should be governed and used a certain way; the engineer builds it and the CISO secures it. In the mid market one fractional leader often carries data alongside technology and security, which keeps these decisions joined up rather than fought over between functions.

Why governance and protection sit at the centre

Data that cannot be trusted is worse than no data, and data that is mishandled is a direct financial risk. The ICO fined British Airways £20 million in 2020 and Interserve £4.4 million in 2022 for failures in protecting personal data, and the IBM Cost of a Data Breach Report 2025 puts the global average cost of a breach at USD 4.44 million. A fractional CDO reduces that exposure by deciding what data you should hold, who is accountable for it and how it is controlled, which is why the role works hand in hand with board cyber governance and a tested incident response plan. For regulated businesses the obligations are heavier still, whether that is NIS2 compliance or the standards expected in financial services. The same discipline keeps a growing risk in check: unsanctioned tools quietly moving your data, the problem of shadow AI.

Why Starkhorn

Starkhorn is led by Daniel J. Jacobs, who has spent over 20 years in technology and security, 15 of them in leadership roles, including Interim Group Technology Director at VetPartners, the BC Partners-backed veterinary group, and CIO and CISO at Jardine Motors Group. He is the author of The Strategy Bridge and holds PRINCE2, ITIL Foundation and full membership of the Institute of Interim Management.

That experience of running technology and security for a private equity backed group and a national motor retailer is exactly the ground a fractional CDO works on: making data trustworthy enough for an owner to act on, governing it properly, and tying it to decisions the board actually makes.

Frequently asked questions