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M&A Advisors

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Mergers and acquisitions advisers in the United Kingdom run sale and purchase processes for private companies: preparing a business for sale, finding and approaching buyers or targets, managing due diligence, and working alongside lawyers through the sale and purchase agreement to completion.

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The regulatory line matters here in a way it does not in general consulting. Arranging deals in investments is a specified activity under the Financial Services and Markets Act 2000 (Regulated Activities) Order 2001, and the FCA states that carrying on regulated activities without authorisation is a criminal offence. There is also a long-standing exclusion in the same Order for activities carried on in connection with the sale of a body corporate, which is why many private company deals are handled by unauthorised corporate finance boutiques. Whether a particular transaction falls inside or outside that exclusion is a legal question about that deal.

The commercial substance is due diligence and risk allocation. Diligence establishes what you are buying. Warranties, indemnities and a disclosure letter decide who carries each risk that diligence could not eliminate. After completion, Companies House filings have to reflect the new reality. Those three things, in that order, are where deals are won and lost.

Who does what on a UK private company deal

  • Corporate finance adviser: runs the process, prepares the information memorandum, approaches buyers and negotiates the commercial terms.
  • Financial due diligence provider: tests the quality of earnings, working capital and net debt, usually a reporting accountant.
  • Commercial due diligence provider: tests the market, the customer base and the forecast from outside the business.
  • Corporate solicitor: drafts and negotiates the sale and purchase agreement, disclosure letter and ancillary documents.
  • Tax adviser: structures the consideration and checks the position of sellers and of the company.
  • Buy-side search adviser, who finds and approaches targets for an acquisitive company rather than selling one.

The FCA perimeter and the sale of a body corporate exclusion

Article 25 of the Regulated Activities Order specifies arranging deals in investments: making arrangements for another person, whether as principal or agent, to buy, sell, subscribe for or underwrite a particular investment, and making arrangements with a view to a person who participates in the arrangements doing so. Shares are investments for this purpose.

Article 70 of the same Order covers activities carried on in connection with the sale of a body corporate. A person does not carry on a regulated activity by entering into a transaction to acquire or dispose of shares in a body corporate, other than an open-ended investment company, where conditions are met — including that the shares represent 50 per cent or more of the voting shares, and that the transaction is between parties each of whom is a body corporate, a partnership, a single individual or a group of connected individuals. The article extends the exclusion to agents, to those making arrangements, and to advisers.

This is a technical area and the details matter. If you are engaging an adviser who is not FCA authorised, ask them in writing why the exclusion applies to your transaction, and check the Financial Services Register for anyone who claims to be authorised.

From heads of terms to completion

Preparation comes first: normalised accounts, a clean cap table, contracts signed and filed, and the corporate record at Companies House tidy. Most of the value destroyed in a deal is destroyed here, months before anyone negotiates, because problems found in diligence cost more than problems fixed in advance.

Heads of terms set the price mechanism, exclusivity period, deal structure and the key conditions. They are usually non-binding on price but binding on exclusivity and confidentiality, and they frame every argument that follows. Spend time on them rather than rushing to get to diligence.

Diligence, then documentation, then completion and post-completion filings. If competition clearance is relevant, remember that UK merger notification is voluntary, so the timetable is a choice the parties make rather than a fixed statutory gate.

Competition clearance and the voluntary UK regime

The CMA can investigate a merger where its jurisdictional tests are met. GOV.UK describes a turnover test, where the business being taken over has a UK annual turnover of at least 100 million pounds, and a share of supply test, where the combined businesses would have a share of at least 25 per cent of the UK market.

GOV.UK guidance on notifying the CMA is explicit that merger notification in the UK is voluntary: even where a merger meets the legal criteria for an investigation, the parties do not have to tell the CMA about it. Where a phase 1 investigation is opened after a complete merger notice, the CMA must finish it within 40 working days.

For most small and mid-market private deals this is not engaged at all. Where it might be, the decision whether to notify belongs with competition counsel, because the consequences of getting it wrong fall on the buyer after completion.

Companies House filings after completion

A share sale changes who owns and controls the company, and the public record has to follow. Directors appointed or resigning, changes to people with significant control and the registered office all have to be filed, and the next confirmation statement must reflect the new position.

The confirmation statement is the annual moment at which all of that is affirmed to the registrar. GOV.UK requires at least one every 12 months and allows it to be filed up to 14 days after the review period ends, which leaves very little slack where completion lands close to the end of a period. Buyers do well to treat the first statement after a deal as a diligence item on their own new subsidiary.

Incoming directors also take on the general duties in the Companies Act 2006, including the duty to promote the success of the company and the duty to declare an interest in a proposed transaction. On a deal with continuing management shareholders, those conflict duties are not theoretical.

Where UK private company deals fall apart

  • Management accounts that do not reconcile to statutory accounts, which destroys confidence in every other number.
  • Customer contracts with change of control clauses nobody read until diligence found them.
  • Employees whose terms differ from their written statements, or who were never issued one.
  • A pension auto-enrolment history with gaps, which becomes a warranty and an indemnity argument.
  • Intellectual property registered in a founder's name rather than the company's.
  • Working capital defined too late, so the completion accounts adjustment becomes a second negotiation.
  • Exclusivity granted for too long, which removes the seller's only real leverage.

Retainers, success fees and what to fix in the engagement letter

Sell-side corporate finance is usually a monthly retainer plus a success fee on completion, often with the retainer credited against the success fee. Buy-side work is structured similarly but with a smaller success element. Diligence providers charge fixed fees or capped fees per workstream.

The clauses that matter most in an engagement letter are the definition of the transaction value the success fee is calculated on, whether deferred consideration and earn-outs count and when, the tail period during which a fee is still payable if you complete with an introduced party after termination, and what happens if the deal aborts.

Get the tail period and the earn-out treatment written plainly. Those two produce more post-completion disputes with advisers than everything else combined.

M&A Advisors: frequently asked questions

Does an M&A adviser need FCA authorisation in the UK?

It depends on the transaction. Arranging deals in investments is a specified activity under article 25 of the Regulated Activities Order, and the FCA states that carrying on regulated activities without authorisation is a criminal offence. Article 70 of the same Order excludes certain activities connected with the sale of a body corporate. Ask any unauthorised adviser to explain in writing why the exclusion applies to your deal.

What is the 50 per cent voting shares condition in article 70?

Article 70 of the Regulated Activities Order sets conditions for the sale of a body corporate exclusion, including that the shares concerned represent 50 per cent or more of the voting shares, and that the transaction is between parties each of whom is a body corporate, a partnership, a single individual or a group of connected individuals. The article also extends the exclusion to agents, arrangers and advisers.

Do we have to tell the CMA about an acquisition?

No. GOV.UK states merger notification in the UK is voluntary, so parties need not notify even where the legal criteria for an investigation are met. The tests GOV.UK describes are a target UK turnover of at least 100 million pounds, or a combined share of at least 25 per cent of the UK market. Whether to notify anyway is a decision for competition counsel on the specific facts.

What is a disclosure letter and why does it matter so much?

It is the seller's written qualification of the warranties in the sale agreement. Anything properly disclosed cannot normally be claimed on later. In practice it is where the diligence findings get converted into allocated risk, which is why it is negotiated hard and why it is drafted by solicitors rather than by the corporate finance adviser.

How long does a private company sale usually take?

Preparation can take months before anything is shown to a buyer. From heads of terms to completion is commonly a few months where diligence is clean and the parties are motivated, and considerably longer where accounts, contracts or employment records need reconstructing. Deals that drag usually do so because preparation was skipped.

Should the same firm do diligence and run the sale?

Buyers generally want independent financial due diligence rather than a report prepared by the seller's own deal adviser. On the buy side, separating the adviser who is incentivised by completion from the provider testing the numbers removes a conflict that is otherwise difficult to manage.

Sources

  1. legislation.gov.uk — Regulated Activities Order 2001, article 25 (arranging deals in investments)
  2. legislation.gov.uk — Regulated Activities Order 2001, article 70 (sale of a body corporate)
  3. FCA — How to apply for authorisation
  4. GOV.UK — Mergers: when they will be investigated
  5. GOV.UK — Tell the CMA about your merger
  6. GOV.UK — Confirmation statement
  7. legislation.gov.uk — Companies Act 2006, general duties of directors

Written by the LokalMatch editorial team. Last reviewed 22 September 2026. How we write and check our guides

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What affects the fees M&A advisors charge

Fees depend on the work involved and how the professional bills. We only publish fee ranges when they’re backed by real LokalMatch data or reliable sources. Until then, here’s what usually changes the fee:

  • Scope and complexity of the work
  • How the firm bills: hourly, per project or on a monthly retainer
  • Experience of the team
  • Timeline and how urgent the work is
  • Ongoing support after the work is delivered

How to compare M&A advisors before you hire

  • Ask for examples of similar work for clients like you.
  • Read reviews and ask for references you can contact.
  • Make sure the scope, deliverables and timeline are written down before work starts.
  • Ask who will do the work: an in-house team, freelancers or subcontractors.
  • Compare two or three proposals before you decide.

Questions to ask M&A advisors before you hire

  • Have you done work like this before, and can I see examples?
  • Who will work on this, and who is my main contact?
  • How do you charge: hourly, per project or monthly?
  • What is included, and what costs extra?
  • How long is the contract, and how can either side end it?
  • How will you report on progress?
  • Who owns the work, files and accounts you set up for me?

Licences and registration

This kind of work is often limited to licensed or registered professionals, and the rules depend on where you are. Ask which body they’re registered with, and check their status on that body’s public register before you hire.

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