# Clean Teams Keep M&A Diligence Useful and Controlled

**Category:** MA
**Author:** John Hotham
**Published:** 2026-10-14
**Read Time:** 5 min read

## Summary
Diligence needs enough information to test the deal thesis, not unrestricted access to commercially sensitive data. Design the clean team before the first data room upload.

## Full Content
# Clean Teams Keep M&A Diligence Useful and Controlled

A deal team needs evidence. That does not mean every commercial leader should see the other party's pricing, customer-level data or future plans.

The CMA's merger interim-measures guidance discusses safeguards for information exchange, including clean teams, non-disclosure arrangements and physical or IT ring-fencing. The right design depends on the information, recipients and circumstances. Parties should assess their own position with competition counsel. [CMA, *Interim measures in merger investigations*](https://www.gov.uk/government/publications/interim-measures-and-derogations-guidance-and-templates/interim-measures-in-merger-investigations-summary-for-businesses)

## Set the rules before the data room opens

Start by classifying the information requested. Ask what question the diligence team needs to answer, whether the answer can be provided in aggregated or anonymised form, and who genuinely needs access. Build the access model before sensitive files are uploaded, not after a folder has already been shared too widely.

A workable protocol should define:

- the clean-team membership and permitted purpose;
- information that is excluded, aggregated or redacted;
- approved storage, access controls and download restrictions;
- how questions and outputs are reviewed before wider circulation;
- retention, return and deletion arrangements if the transaction does not complete.

Keep competitively sensitive detail away from people who make day-to-day pricing, customer, capacity or market decisions where appropriate. Do not assume that an NDA alone solves the problem. Access, use and onward disclosure all need controls.

## Separate diligence from integration

Diligence is not permission to combine operations. Until completion and any required regulatory steps, maintain clear responsibility for each business's ordinary-course decisions. Route any proposed operational change, customer contact or sharing of additional information through the agreed legal and regulatory review.

This is also an execution issue. A poorly designed process can slow diligence, contaminate decisions and create a cleanup exercise when the deal team should be testing value. A disciplined protocol gives the right specialists enough evidence while preserving a clear record of who saw what and why.

## Keep an auditable trail

Record approvals, access lists, data releases, questions, clean-team outputs and exceptions. Revisit access when the workstream changes. At each gate, confirm that the next request is still necessary and proportionate to the diligence question.

The buyer should know which assumptions are supported by evidence, which remain uncertain and what cannot be circulated outside the restricted group. That is a better basis for a decision than a crowded data room and an uncontrolled stream of emails.

*This is a governance overview, not legal advice. Obtain transaction-specific competition and regulatory advice.*

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