Disclosure Letters in a UK Share Sale: A Seller's Guide

TL;DR. In a UK share sale the seller gives warranties: statements about the company that let the buyer claim if they turn out to be untrue. The disclosure letter is the seller’s answer to them, a list of exceptions. A matter fairly disclosed in it cannot found a warranty claim, which is why sellers disclose broadly and buyers push back on general disclosures. English courts read “fairly disclosed” strictly, and merely pointing the buyer at a document is generally not enough. Below: how disclosure works, general and specific disclosures, the data room as disclosure, the timetable to completion, warranty and indemnity insurance, and a checklist for sellers.

This guide is for owners and advisers selling a UK company. The disclosure letter is prepared alongside the sale agreement near the end of selling a business in the UK, and the limits on warranty claims are first set out in the heads of terms. Asset sales use the same mechanism against the warranties in the asset purchase agreement. The law described is that of England and Wales.

What is a disclosure letter?

A disclosure letter is a letter from the seller, and anyone else giving warranties, to the buyer. It sets out the facts that make the warranties in the share purchase agreement (SPA) untrue or incomplete. The SPA says the warranties are qualified by matters disclosed in the letter, so the buyer cannot claim for a breach of warranty in respect of a matter that was properly disclosed.

The seller’s solicitor drafts it, the buyer’s solicitor negotiates it, and it is normally dated the same day as the SPA and delivered at signing. In deals run on US lines, the same job is done by disclosure schedules attached to the agreement.

The disclosure letter is not the same thing as due diligence. Due diligence is the buyer finding things out; the disclosure letter is the seller’s formal, contractual statement against the warranties. Information given during due diligence counts as disclosure only if the SPA and the letter say so. In Veranova Bidco v Johnson Matthey (2026), the Commercial Court held that neither side could rely on what had been said or discussed earlier to decide whether the material in the letter amounted to fair disclosure (paragraph 101).

How does a disclosure letter qualify the warranties?

Warranties are statements of fact about the company, such as that the accounts are accurate, that there are no disputes beyond those listed, or that no key contract is being renegotiated. If one is untrue and the buyer loses money as a result, the buyer can claim damages from the seller, subject to the caps, time limits and thresholds in the SPA.

A matter fairly disclosed against a warranty takes it out of the claim. That is why a seller wants to disclose everything that might make a warranty untrue: disclosure is the seller’s main protection against a claim after completion, and it moves the conversation about a problem to before signing, when the price can still be adjusted, rather than after, when the buyer’s remedy is a claim.

A buyer sees it the other way. The warranties are how risk is shared, and every broad disclosure weakens them. When a real problem is disclosed, a buyer typically responds in one of four ways:

• Price. Reduce the price to reflect the problem.
• Specific indemnity. Ask the seller to repay any loss from that matter pound for pound. Indemnities are normally drafted so that disclosure does not limit them.
• Condition. Make fixing the problem a condition of completion.
• Withdraw. Walk away before signing.

The SPA also says whether the buyer’s own knowledge, gained outside the disclosure letter, affects a claim. That point is negotiated separately.

General and specific disclosures: what is the difference?

A disclosure letter has two parts. General disclosures apply to every warranty and usually cover information the buyer could find or has been given. Specific disclosures are set against numbered warranties and describe particular facts.

Specific disclosures are where most of the protection is. Compare:

• Weak: “Warranty 14.2: The Company is from time to time involved in disputes with customers in the ordinary course of business.”
• Strong: “Warranty 14.2: On 3 March 2026 [Customer] Ltd disputed invoice 4471 for £38,400, alleging late delivery. The Company rejected the claim by letter dated 17 March 2026. No proceedings have been issued. The correspondence is at data room documents 9.2.1 to 9.2.4.”

The first tells a buyer nothing it can assess. The second states the facts, the amount and the status, and points to the documents for detail rather than in place of it.

What does “fairly disclosed” mean?

The SPA defines the standard. A common formula is that a matter must be fairly disclosed with sufficient detail to enable a reasonable buyer to identify, or make an informed assessment of, the nature and scope of the matter. The exact words matter, and the courts apply them strictly.

In Triumph Controls v Primus International (2019), the High Court drew together the earlier cases into a set of principles (paragraph 335). Among them:

• A disclosure letter that tries to disclose specific matters merely by referring to other documents as a source of information will generally not be adequate, so disclosure by omission will rarely be enough.
• The parties can agree the form and extent of disclosure that counts, including disclosure by reference to documents in a list or a data room.
• Where disclosure is made by reference to other documents, only matters that can be ascertained directly from those documents are treated as disclosed.

Veranova Bidco v Johnson Matthey (2026) shows how this plays out. The disclosure letter ran to some 303 pages and disclosed that pricing negotiations with a key customer were under way. It did not disclose that the customer had invoked a price match clause on the strength of a verified third party offer at around half the price, which the business would need to match to keep the customer’s business. The judge found the disclosure might cover the nature of the matter but not its scope, and that nothing in the disclosure letter or the data room amounted to fair disclosure (paragraphs 112 and 116). On the letter’s clause deeming full particulars disclosed, she said the test was whether the brief particulars given “enable a purchaser to say ‘I want to see more about X’”; if the buyer is not even alerted to the possibility of an X, the clause cannot help the seller (paragraph 116). She added that if the seller thinks something said earlier is needed to understand a disclosure, “then it should disclose it explicitly” (paragraph 103).

For a seller, the practical rule is simple: put the fact, its scale and its current status in the letter itself, and use documents as support, not as a substitute.

What is the disclosure bundle?

The disclosure bundle is the set of documents referred to in the disclosure letter, collected and indexed and delivered with it. It used to be a set of lever-arch files; it is now usually electronic, and often it is the data room itself, or a copy of it.

The bundle matters most years later. If the buyer brings a warranty claim, the first question is what was disclosed, and an agreed, dated copy of the documents answers it without argument. In Triumph Controls, the descriptive index of the data room was initialled by both parties and a copy was attached to the disclosure letter (paragraph 348). Both sides’ solicitors should hold identical copies.

Can the data room count as disclosure?

It can, if the SPA and the letter say so, and disclosing the data room is common practice in UK sales. The usual form is a general disclosure of the contents of the data room as they stood at a cut-off time, identified by an index attached to the letter and an archived copy, on a USB stick or as a download, held by both sides’ solicitors.

Buyers negotiate how far it counts:

• Whether it counts at all, or only the documents specifically referred to in the letter.
• The cut-off, and whether documents uploaded in the last days before signing are included.
• The standard. Whether data room documents must meet the same fairly disclosed test as the letter. Buyers ask for this, so that a document buried in the room does not disclose a matter a reasonable buyer would not have found.
• Q&A replies, and whether written answers given during due diligence form part of the disclosure.

Even where the whole data room is disclosed, the Triumph Controls principle applies: only what can be ascertained directly from the documents counts. A large data room does not rescue a vague letter, as Veranova shows. Anything material should be disclosed specifically as well.

For the data room itself, freeze it at the agreed cut-off, finalise a numbered index, keep the Q&A log, and check that every document opens and is complete. In Beamprobe, Export as ZIP downloads the documents in a room as numbered PDFs in their folder structure, with an INDEX.txt that records the room’s name, the export time and each document’s number, folder and file name, and the Q&A log exports as a CSV. How the archive is certified and held is a matter for your solicitors.

What is the timetable, from first draft to completion?

Timings depend on the deal; the order of events is fairly constant.

The warranties change as the SPA is negotiated, so the letter changes with them. Leave time for at least one full round of comments from the buyer’s solicitor before signing.

What happens when warranties are repeated at completion?

Private company sales often sign and complete on the same day, and then there is nothing to repeat. Where completion follows later, for example because a consent or clearance is needed, the buyer usually asks for the warranties to be given again at completion, by reference to the facts at that time.

Anything that goes wrong between signing and completion then becomes a possible breach, so the seller asks to disclose it in a supplementary disclosure letter. Buyers resist letting that letter limit their claims, because it would put the risk of the gap on them. The outcomes are negotiated, and include:

• the supplementary letter informs the buyer but does not limit its claims;
• it limits claims only for matters that first arose after signing;
• the buyer may withdraw if a disclosed matter is material, with the SPA saying whether a buyer that completes anyway keeps its claim.

Between signing and completion the seller is also usually bound by covenants on how the business is run and an obligation to tell the buyer about anything that would breach the warranties.

How does warranty and indemnity insurance affect disclosure?

Warranty and indemnity (W&I) insurance pays for losses caused by a breach of warranty, most commonly under a policy the buyer takes out. A 2026 note from Paul Hastings on the UK market describes three features of a typical buy-side structure that bear on disclosure:

• Seller liability for business warranties under the sale agreement is limited to nominal amounts, frequently £1, except for fraud, so the buyer’s main recourse is to the insurer.
• Standard exclusions include the actual knowledge of the buyer’s deal team and matters fairly disclosed in the transaction documents, the data room and the due diligence reports.
• Repeated warranties are covered at completion only on conditions that include an updated seller disclosure letter.

So insurance changes who pays, not whether to disclose. A disclosed matter is outside the policy, the insurer underwrites on the strength of the due diligence and the disclosure, and the seller stays exposed for fraud. A careful disclosure letter matters as much on an insured deal as on any other.

A seller’s disclosure checklist

• Read the warranties as a questionnaire. Answer each one in writing with your solicitor, and record who checked what.
• Ask the people who know. Your finance lead, HR, operations and anyone who manages key customers or suppliers.
• For each matter, give the facts. What happened, who is involved, when, how much, and where it stands now, with document references.
• Avoid vague words such as “from time to time”, “certain” and “various” where you know the details.
• Do not rely on calls, meetings or emails. If the buyer needs it to understand a disclosure, put it in the letter.
• Check the areas where problems tend to sit: disputes and threatened claims, HMRC enquiries, employee grievances and tribunal claims, data breaches, customer or supplier contracts being renegotiated or lost, change of control clauses, regulatory correspondence, late Companies House filings, and changes since the last accounts date.
• Agree the general disclosures early, including which public register searches count and the data room cut-off.
• Freeze, index and archive the data room before signing, and keep the Q&A log.
• If completion is later than signing, keep a log of new matters and agree how a supplementary letter will work.
• Keep the letter, the bundle and the archive for at least the claim periods in the SPA, which for tax claims can run for years after completion.

How Beamprobe fits

The data room is where most disclosure material lives, and its contents at signing are what a buyer will later say it did or did not see. Beamprobe is a UK virtual data room for that stage: each buyer and adviser has their own link, so you can see which documents each one opened, documents sit in folders you lay out to match the buyer’s request list, and the room exports as a ZIP of numbered PDFs with an index file for the archive copy, with the Q&A log as a CSV. Pro is £29 a month with no per-user fees and adds an NDA gate and watermarked documents.

If you have not built the room yet, start with the free M&A data room index builder.

Related reading

• How to Sell a Business in the UK: A Step-by-Step Guide
• Heads of Terms for a UK Business Sale: Guide and Template
• Completion Accounts: How the Price Adjustment Works in a UK Company Sale
• M&A Data Room for UK Founders: Checklist and Guide
• Data Room for Due Diligence UK: Checklist + Guide
• NDA template builder