What Does an M&A Adviser Actually Do?

If you've started thinking about selling your business, you've probably heard the term 'M&A adviser.' But what does one actually do? And why do so many business owners say they couldn't have completed their sale without one?

This article sets out the role clearly what you should expect from a good adviser, what they do at each stage, and what separates a professional advisory firm from a business broker or online marketplace.

First: What is M&A?

M&A stands for mergers and acquisitions. It is the discipline of buying, selling, and combining businesses. An M&A adviser, sometimes called a corporate finance adviser, specialises in guiding business owners through the sale process, from initial preparation through to completion.

Owners are lucky to sell a business once in their lifetime. An M&A adviser does it repeatedly, and that experience is the foundation of the value they add.

The Adviser's Role: An Overview

A sell-side M&A adviser acts exclusively on your behalf throughout the sale process. Their job is to achieve the best possible outcome for you, not just in terms of headline price, but across the full structure of the deal: terms, timing, certainty, and fit.

In practice, that means taking responsibility for the following:

1. Valuation and Market Positioning

Before a business goes to market, your adviser will work with you to establish a realistic and defensible valuation, one that reflects what buyers will actually pay, not just what you hope to achieve.

This involves analysing your financial performance, identifying the key value drivers in your business, and understanding how comparable transactions have been priced in your sector. A good adviser will also identify the adjustments that can legitimately increase your EBITDA, presenting your business in the most favourable, credible light.

2. Preparing the Business for Market

Before approaching any buyer, a professional adviser will help you prepare. That typically includes:

• Producing an Information Memorandum (IM), a detailed document that presents your business compellingly to prospective buyers
• Reviewing your financial records for clarity, consistency, and any gaps that could create concern during due diligence
• Identifying structural or operational issues that could reduce value or cause a deal to stall later
• Advising on whether and how to address those issues before going to market

This preparation phase is often where the most value is created. Owners who go to market without it tend to achieve lower prices and face more friction during the process.

3. Identifying and Approaching Buyers

One of the most valuable things an adviser brings is access, to a network of buyers that most owners simply cannot reach independently.

A credible M&A adviser will work with you to define the right buyer universe: trade buyers in your sector, financial buyers such as private equity, or owner-managers looking to grow through acquisition. They will then approach those buyers discreetly and professionally, managing confidentiality throughout.

Going to market without professional representation often means approaching the wrong buyers, or approaching the right ones in the wrong way. First impressions in M&A are difficult to recover from.

4. Managing the Process

Once buyers are engaged, the process becomes complex quickly. Your adviser manages the entire lifecycle: coordinating information requests, running structured bid processes, handling multiple interested parties simultaneously, and maintaining competitive tension to protect your position.

This is particularly important in preventing deals from drifting. An experienced adviser keeps momentum, sets clear timescales, and ensures that a single interested buyer does not take an unreasonable amount of time at the exclusion of others.

5. Negotiating Terms

Headline price is only part of the negotiation. Your adviser will work to protect your interests across the full range of deal terms, including:

• How and when consideration is paid (upfront cash, deferred consideration, earn-outs)
• The structure of the deal, share sale versus asset sale
• Warranties and indemnities in the Share Purchase Agreement
• Working capital targets and completion mechanics
• Your ongoing involvement post-completion, if applicable

These terms can be worth as much as, or more than, differences in headline price. A skilled adviser knows where to push and where to hold.

6. Guiding You Through Due Diligence

Due diligence is the period where buyers examine your business in depth;  financial, legal, commercial, and operational. It is often the most stressful part of the process for sellers.

Your adviser coordinates your response, works alongside your solicitor and accountant, and ensures that the scope of requests remains proportionate and manageable. They also act as a buffer, protecting you from direct buyer pressure during a period when confidentiality and composure matter most.

7. Protecting the Deal to Completion

Deals fall apart for many reasons: unexpected due diligence findings, buyer financing issues, changing market conditions, or simply a breakdown in trust between the parties. Your adviser's job is to anticipate these risks and navigate around them.

That means maintaining relationships on both sides of the transaction, managing expectations, and, when issues arise, finding pragmatic solutions that allow the deal to proceed.

The Barnsgate Solutions Approach

At Barnsgate Solutions, we act exclusively on behalf of sellers. We guide business owners through the full sale process, from initial valuation and market preparation through to final completion, with a focus on achieving the best possible outcome, not just the fastest one.

We work with businesses across the UK, with experience in technology, manufacturing, and professional services. Our team brings structured process, market knowledge, and genuine personal commitment to every mandate we take on.

If you are thinking about selling your business, whether now or in the next two to three years, we would welcome the opportunity to have a confidential conversation.