M&A guide

NDA for Selling a Business (UK): Protecting a Confidential Sale

How to protect confidential information when selling your business — what a sale-process NDA must cover, and a step-by-step approach to vetting buyers before you open the books.

By Richard Wood, Founder8 min readUpdated 31 May 2026Last reviewed 31 May 2026M&AUK lawtemplateshow-to

Selling a business means handing a stranger your most sensitive information — and sometimes that stranger is a competitor doing due diligence. A sale-process NDA is the gate you put in front of the data room.

This is general information, not legal advice

NDASafe is a document preparation service, not a law firm. Our templates are legally reviewed against applicable UK law at the point of release, but every situation is different. Where significant value, unusual risk or a cross-border element is involved, take independent legal advice before you sign.

What's at stake

In a sale you expose financials, customer lists, contracts, margins, employee details and IP. If the deal collapses, the buyer walks away knowing all of it. The NDA is what stops them using it — and stops them telling the market you were for sale.

What a sale-process NDA must cover

Follow the step-by-step approach below. The essentials are a broad definition of confidential information (including the existence of the process), a tight permitted purpose, non-solicitation and non-circumvention, controlled onward disclosure, and a sensible term — see how long an NDA should last.

A mutual NDA for deal conversations

The NDASafe Mutual NDA suits sale and acquisition talks where both sides share information, and can be tightened with non-solicitation and non-circumvention. £29, or £79 for all eight.

Step by step

1
Get the NDA signed before anything sensitive
No financials, customer data or operational detail leaves your hands until the prospective buyer has signed. The teaser can be light; everything in the data room waits for signature.
2
Name the confidential information broadly but clearly
Cover financials, customer and supplier lists, contracts, employee information, IP and the existence of the sale process itself — the fact you are selling is often the most sensitive item.
3
Restrict the purpose to evaluating the acquisition
The buyer may use what they learn only to assess the deal — not to compete, poach staff, or approach your customers and suppliers. Add non-solicitation and non-circumvention.
4
Set a sensible duration
Two to three years is common for a sale process; genuine trade secrets can survive longer. See the duration guide.
5
Control onward disclosure
Limit who on the buyer's side can see the information — named advisers and deal team only, each bound by the same terms.

Frequently asked questions

What NDA do I need to sell my business?

A robust mutual or one-way NDA covering the whole sale process, including non-solicitation (of staff and customers) and non-circumvention, and protecting the fact of the sale itself. A mutual NDA suits situations where the buyer also shares information.

Should the NDA cover the fact that I'm selling?

Yes. For many owners the most damaging leak is simply that the business is for sale — it unsettles staff, customers and suppliers. A sale-process NDA should expressly make the existence and details of the process confidential.

How long should a business-sale NDA last?

Two to three years is typical for the deal information, with trade secrets protected for as long as they remain secret. Match the term to how long the disclosed information stays commercially sensitive.