non disclosure agreement nda

What is a Non-Disclosure Agreement (NDA)?

A non-disclosure agreement (NDA) is a legal contract that protects confidential information shared between parties. It sets clear rules on what information must remain private, how it can be used and what happens if it is disclosed without permission.

NDAs are widely used in business, legal and M&A contexts to allow organisations to share sensitive information while reducing the risk of misuse.

How does an NDA work?

An NDA is not just about keeping information secret. It is about controlling behaviour around that information. It defines how recipients can use the data they access as part of an M&A, investor fundraising campaign, employer-contractor project or any other process that requires confidentiality. It also advises who the other party can share information with and what safeguards they must apply.

This means the agreement focuses on:

  • Restricting use of information to a specific purpose, such as evaluating a transaction
  • Limiting disclosure to defined individuals like advisors or internal teams
  • Requiring appropriate security measures to protect the information

NDAs in M&A

In an M&A process, the NDA enables the seller to open up access to detailed business information while maintaining control. It creates a legal boundary before due diligence begins.

You will typically see NDAs used:

  • Before granting access to a virtual data room
  • When sharing financial data, contracts or strategic plans
  • During discussions with multiple potential buyers

This ensures that even in a competitive process, sensitive information remains protected.

Types of NDAs

Different types of NDAs reflect how information flows between the parties.

NDA type

How it works in practice

Typical M&A scenario

Unilateral NDA

Only one party discloses confidential information while the other agrees to protect it and not use it beyond the agreed purpose.

Seller shares detailed business information with a potential buyer during early-stage due diligence.

Mutual NDA

Both parties exchange sensitive information and agree to protect each other’s data under the same terms.

Two companies explore a merger or strategic partnership and both need to share financial and operational details.

Multilateral NDA

Several parties are involved, with one or more disclosing information and all agreeing to confidentiality obligations within a single agreement.

A competitive M&A process involving multiple bidders, advisors and external experts accessing the same data room.

Key elements of an NDA

An NDA relies on a set of legal provisions to make it effective. These go beyond simply stating that information is confidential.

  • Defined scope of information to avoid ambiguity about what is protected
  • Purpose limitation clauses to prevent use outside the agreed context
  • Disclosure controls that restrict sharing to approved individuals
  • Obligations to return or delete information once discussions end.

Limits of an NDA

An NDA reduces risk, but it does not eliminate it. It cannot physically stop someone from sharing information, and enforcement often happens after a breach has occurred.

It also depends on clear drafting. If you are vague about the scope of confidential information or permitted use, it becomes harder to enforce the agreement.

For this reason, organisations usually combine NDAs with operational controls such as restricted access, monitoring and virtual data rooms.

Common risks and how to avoid them

NDAs can fail when they are treated as a formality rather than an active control. For example:

  • Using generic templates that do not reflect the specific transaction
  • Allowing too many people access to confidential information
  • Failing to monitor how information is used after disclosure.