Technology Due Diligence: The Red Flags Acquirers Miss

The technology red flags acquirers miss are rarely hidden. They sit in places a standard diligence questionnaire does not look: who actually holds the knowledge, which contracts cannot be moved, what the security program does in practice rather than on paper, and how much deferred spending is waiting after close. A useful diligence readout turns each of those into a cost, a timeline, and a decision.

What Technology Due Diligence Is For

Technology due diligence is an independent assessment of a target's systems, security, people, and vendor commitments to determine what the buyer is really acquiring and what it will cost to own. It is not an audit and it is not a checkbox. Its job is to change the deal: price, structure, representations, the integration plan, or in some cases the decision to proceed.

In our principals' experience leading diligence and integration on transactions large and small, the issues that hurt most after close were rarely technical surprises. They were known problems that nobody had priced.

Red Flags That Slip Through

• Key person dependency. One administrator, developer, or long-tenured vendor contact knows how the critical systems work, and nothing is written down. If that person leaves after close, operations slow or stop.
• Change of control clauses in software and service contracts. Licenses that terminate, reprice, or require consent on acquisition can add cost or delay integration. These are often buried in reseller agreements nobody in the data room reviewed.
• Deferred infrastructure spending. Servers, network equipment, and operating systems past vendor support look fine on a balance sheet. They show up as an unplanned capital request in the first year of ownership.
• Customized or orphaned core systems. A heavily modified ERP or a homegrown application with no remaining author can block upgrades, integration, and reporting for years.
• Security that exists on paper. Policies are present, but multifactor authentication has gaps, backups have never been tested by restoring them, and nobody reviews privileged access. Ask for evidence, not documents.
• Unreported or quietly handled incidents. A past ransomware event, business email compromise, or data exposure that was resolved informally may carry ongoing legal or notification exposure.
• Shadow IT and unmanaged data. Business units running their own cloud tools, spreadsheets that function as systems of record, and customer data in places IT does not know about.
• Undisclosed AI use. Staff feeding customer or proprietary data into public AI tools, or products that rely on models the company does not govern, can create privacy and intellectual property questions.
• Carve-out entanglement. When buying a division, shared systems, shared licenses, and shared staff with the parent can make separation slower and more expensive than the transition services agreement assumes.

A red flag is not a reason to walk away. An unpriced red flag is a reason to renegotiate.

Why These Get Missed

Most misses come from process, not skill. Diligence windows are short, data rooms are curated by the seller, and technology is often reviewed last, after the financial and legal workstreams have set expectations. Questionnaires ask whether a control exists, and the answer is usually yes. The more useful question is how the target knows it works.

The other common gap is talking only to the CIO or IT director. Conversations with the people who run the help desk, manage the network, and administer the core systems often reveal more in an hour than a week of document review.

What a Diligence Readout Should Cover

A diligence readout should let a deal team act, not just read. At minimum it should include:

• A plain-language summary of the top findings, ranked by deal impact, that an investment committee can absorb in five minutes.
• A cost estimate for remediation in the first 12 to 24 months, separated into one-time and recurring spend.
• Integration or separation complexity, including systems that must be replaced, migrated, or kept running under a transition agreement.
• Security posture against a recognized framework, such as NIST CSF 2.0, with evidence of what was tested rather than self-reported.
• People and vendor risk: key person dependencies, retention recommendations, and contracts with change of control or termination exposure.
• Recommended deal protections, such as specific representations, escrow or holdbacks, closing conditions, or price adjustments.
• A 100-day plan for the first actions after close, so the findings do not sit in a binder.

How to Get More Out of the Process

• Bring technology into diligence early, before price expectations are fixed.
• Request evidence: a recent backup restore record, an access review, a vulnerability scan, an incident log.
• Interview operators as well as executives.
• Have someone who has run technology operations, not only assessed them, interpret the findings.
• Tie every finding to dollars, time, or a deal term.

To help deal teams start, we publish a free technology due diligence checklist covering the areas above.

The Bottom Line

The red flags that cost acquirers the most are usually visible to anyone who knows where to look and insists on evidence. A good diligence readout converts each finding into a price, a timeline, or a deal protection, and hands the buyer a plan for the first 100 days. If your diligence report does not change anything about the deal, it was not deep enough.

Start with our free technology due diligence checklist, or talk with us about an upcoming transaction.