Firms that skip comprehensive technology due diligence can see 20 to 30 per cent of a target’s value eroded by unmitigated technology risk. The uncomfortable half of that statistic is that the risks were present, and knowable, long before the process began.
Technology due diligence has a reputation as something done to a business rather than by it. An acquirer arrives, a data room opens, a list of questions appears, and a management team spends six weeks assembling answers to questions it has never previously been asked.
The findings are then priced. Not always as a discount — more often as an indemnity, a retention, an escrow, or a hundred-day plan that consumes the first year of the investment thesis. All of these are value transfers away from the seller, and all of them are avoidable.
What acquirers are actually assessing
A technology diligence exercise in the UK mid-market typically covers six areas, and it is worth reading them as a checklist a business could run on itself.
The estate and who owns it. What is running, on what, under whose contract, with what licensing exposure. The common finding is not that something is old; it is that nobody can produce a definitive list.
People and key-person risk. Whether critical systems depend on individuals rather than documentation. A single named engineer who is the only person who understands the pricing engine is a valuation issue, not an HR one.
Security and certification. Not merely whether controls exist, but whether evidence of their operation exists. The gap between policy and practice is where acquirers find their leverage.
AI and data exposure. Newly prominent, and newly awkward. What data trains what, under whose terms, with what consent basis, and what happens if a model provider changes its licensing.
The delivery record. Whether the team ships predictably. Roadmaps are aspiration; release history is evidence.
The cost runway. What the estate will cost over the hold period, including the modernisation the seller has deferred. Deferred cost is the most reliably underestimated item in any diligence pack.
20–30%
of target company value can be eroded by technology risks that were not identified or mitigated before the process began
Why mid-market businesses are exposed here
Mid-market companies are frequently excellent operationally and thin on documentation. The systems work. The people know how. Neither of those facts is transferable, and transferability is precisely what an acquirer is buying.
There is also a timing asymmetry that works against sellers. A management team preparing for a process is busy running the business and building the equity story. Technology diligence readiness is the item that slips, because it has no revenue attached and no internal advocate. It becomes urgent at exactly the moment when it is too late to fix anything — only to disclose it.
Disclosure is not remediation. An acquirer prices a known problem more harshly than an absent one, because now it is their problem.
The eighteen-month view
Nearly every finding that damages value in a technology diligence is a finding the business could have generated itself, at leisure, at low cost, with time to act.
An unsupported database version is a project when you have eighteen months and a disclosure when you have six weeks. Undocumented architecture is a fortnight of an architect’s time in advance and an unquantified risk under time pressure. Concentrated key-person dependency is solvable by deliberate cross-training over two quarters and unsolvable in a data room.
The pattern is consistent: the cost of fixing these things ahead of a process is materially lower than the value they remove during one. That arithmetic is the entire argument for running diligence on yourself.
A self-diligence exercise worth running now, not later
- Produce a definitive asset and contract inventory — if it takes more than a week, that is itself the finding
- Identify every system with a single point of human dependency, and name the second person for each
- Collect twelve months of evidence that your controls operated, not merely that they exist
- Write down the AI and data position: what is used, under whose terms, on what legal basis
- Cost the modernisation you have deferred, honestly, over a three-year hold
- Assemble the release history — predictability is the cheapest credibility you can offer
This is not only for businesses that are selling
The obvious objection is that this matters only when a transaction is in view. It is worth resisting.
Every item on that list is a genuine operating risk regardless of whether anyone is buying. Undocumented systems slow delivery. Key-person concentration creates outages. Unevidenced controls fail audits and lose tenders. Deferred modernisation compounds. Diligence readiness and operational health are very nearly the same list, which is why the work pays for itself even if the process never happens.
With PE respondents broadly expecting higher deal counts and aggregate value through 2026, and with acquirers applying more scrutiny after a cohort of accelerated pandemic-era deals underperformed, the probability that a healthy mid-market business receives an approach is not low.
The question is not whether your technology would survive due diligence. It is whether you would rather find out from an acquirer, or from yourself, while there is still time to do something about the answer.