How To Purchase a Company in the UK: Legal Steps, Risks and Documents

Buying an existing company can be a smart way to grow. You get customers, a brand, systems and staff from day one - without starting from scratch.

But the legal side matters. A well-structured purchase protects you against hidden liabilities, preserves value, and keeps the transition smooth for staff and customers.

In this guide, we’ll walk through how to purchase a company in the UK, the difference between asset and share deals, key legal checks, the main documents you’ll need, and how to manage employees, contracts and leases when you take over.

Asset Purchase Vs Share Purchase: Which Structure Should You Choose?

Early on, you’ll decide whether to buy the company’s shares (a “share purchase”) or only selected assets (an “asset purchase”). Each route has different tax, risk and practical implications.

Share Purchase

In a share purchase, you acquire the shares of the target company. The company itself continues operating with the same legal identity - same contracts, employees, licences and liabilities - but with you as the new owner.

Pros:

• Continuity: supplier and customer contracts usually remain in place, reducing disruption.
• Licences/permits: often stay with the company, which can speed up completion.
• Brand goodwill: can be easier to preserve, as the entity does not change.

Cons:

• Liabilities: you inherit historical liabilities unless specifically protected.
• Complex due diligence: you’ll need deeper investigation across the whole company.

Share purchases are usually documented in a Share Sale Agreement with a detailed disclosure process, warranties and indemnities.

Asset Purchase

In an asset purchase, you (or your company) buy specific assets - for example, the brand, customer lists, equipment, stock and sometimes the business as a going concern - while leaving unwanted assets or liabilities behind.

Pros:

• Risk control: you can cherry-pick what you buy and ring-fence legacy issues.
• Flexibility: negotiate which contracts, IP and employees transfer across.

Cons:

• Consents and transfers: suppliers, landlords and licensors may need to consent.
• Employment and TUPE: staff may transfer automatically (see below) and must be managed carefully.

Asset deals are typically documented in a Business Sale Agreement (also called an Asset Purchase Agreement) with schedules listing each asset and contract to be transferred.

What Legal Due Diligence Should You Do Before You Purchase A Company?

Thorough due diligence is non-negotiable. It validates what you’re buying, helps you price the deal, and informs the protections you need in the contract.

Corporate And Financial

• Company records: check share capital, articles, statutory registers and filings under the Companies Act 2006.
• Financials: review management accounts, audited accounts, cash flow, debt, and off-balance sheet liabilities.
• Litigation/disputes: claims, threatened proceedings or regulatory investigations.

Commercial Contracts

• Top customers/suppliers: revenue concentration, termination rights, price increase clauses, change of control or assignment restrictions.
• Key partnerships and licences: scope, non-compete/non-solicit terms, exclusivity and renewal windows.
• Transfer mechanics: will each agreement require novation or consent?

Where contracts do need to move to your entity, a Deed of Novation can transfer obligations and rights with the counterparty’s consent.

Employment And People

• Headcount and roles: organisational chart, key-person risk, vacancies.
• Contracts and policies: check terms, restrictive covenants, bonuses and accrued holiday.
• Rewards and options: EMI or other share schemes; unpaid commission.

If you’re acquiring the business as a going concern, the Transfer of Undertakings (Protection of Employment) Regulations 2006 (TUPE) may apply, moving employees and their terms to you automatically. Understanding employee rights on a business sale is key to avoiding costly missteps.

Intellectual Property And Data

• Trade marks and brand assets: confirm ownership, registrations and assignments.
• Software and content: licences, contractor IP assignments, open-source use.
• Data protection: GDPR/Data Protection Act 2018 compliance, privacy notices, data retention and security posture.

Post-completion, align your data protection framework and ensure the target’s website has an appropriate Privacy Policy and, if relevant, a robust Data Processing Agreement with vendors handling personal data.

Property And Leases

• Freehold: title, charges, planning permissions, environmental issues.
• Leases: rent review, break options, alienation and assignment provisions, dilapidations.

If you need to step into the seller’s premises, understand the process for assigning a lease, including landlord consent, deposit and potential guarantees.

Regulatory And Compliance

• Sector licences: FCA permissions, health and safety registrations, alcohol/food licences, or professional accreditations.
• Consumer law: Consumer Rights Act 2015 obligations around refunds, repairs and advertising.
• Competition/merger control: most SME deals won’t trigger UK merger control, but consider CMA thresholds and information-sharing rules during diligence.

Due diligence can feel overwhelming. A structured approach and a clear data room list save time and money - many buyers use a tailored legal due diligence checklist to keep things on track.

Key Legal Documents In A UK Business Purchase

Once you’ve agreed headline terms, the legal documents bring your deal to life and protect you against unknowns.

Heads Of Terms (HoTs)

Non-binding commercial summary covering price, what’s included, timing, exclusivity and confidentiality. It sets expectations and reduces later friction.

Sale Agreement

For a share deal, the core document is a Share Sale Agreement. For an asset deal, it’s a Business Sale Agreement. Expect detailed clauses on:

• Price and adjustments: completion accounts or locked box; stock valuation; debt/cash items.
• Warranties: statements about the business (e.g. accounts are true, no disputes, IP owned). If a warranty proves untrue, you may have a claim.
• Indemnities: specific protections for known risks (e.g. a tax indemnity).
• Limitations: caps, time limits and thresholds for claims.
• Restrictive covenants: preventing the seller from poaching staff or competing for a set period.

Disclosure Letter

Here the seller discloses exceptions to the warranties. Carefully review - disclosures will limit your ability to claim later. Your due diligence should map to the disclosures to avoid gaps.

Transfer And Ancillary Documents

• Asset schedules and assignments: IP, domain names, software and equipment lists.
• Novations/consents: a Deed of Novation for key contracts; landlord consent for leases.
• Employment transfers: statutory TUPE notices, information and consultation records; updated Employment Contract templates for post-completion hires.
• Share transfers (if company reorganisation is needed): stock transfer forms and stamp duty for a share transfer between existing group entities.

Completion Checklist

A practical schedule of everything to sign, deliver and confirm on completion - bank mandates, insurance, resignations/appointments, and releases. Many buyers work from a structured completion checklist to make sure nothing gets missed.

How To Manage Employees, Contracts And Leases On Takeover

The value you’re buying often sits with people and relationships. Plan your transition so operations don’t skip a beat.

Employees And TUPE

Where TUPE applies, employees assigned to the business transfer to you automatically on their existing terms. You must consult with affected staff and avoid dismissals connected to the transfer unless there’s an economic, technical or organisational (ETO) reason requiring changes.

Build a clear integration plan that respects TUPE rules, honours accrued rights (holiday, pension, continuity), and communicates early with staff. For new hires post-completion, issue up-to-date Employment Contract terms consistent with your policies.

Customer And Supplier Contracts

In a share deal, most contracts remain in place but check change of control clauses. In an asset deal, confirm which contracts can be assigned and which require novation or fresh agreement. Map critical suppliers and ensure all required consents are conditions to completion.

Premises

Agree whether you’ll take an assignment of the existing lease, negotiate a new lease, or relocate. Factor in landlord diligence and timing - lease consent is a common critical path item.

Data And Technology

Transfer domain names, software subscriptions, licences and cloud environments. Update privacy notices and cookies information promptly. If third parties process personal data on your behalf, put in place a compliant Data Processing Agreement.

Step-By-Step: The Process To Purchase A Company

1) Align On Strategy And Structure

Clarify whether an asset or share purchase best fits your objectives, risk appetite and tax position. Speak with your accountant and a lawyer at this stage - structure drives everything that follows.

2) Indicative Offer And Heads Of Terms

Set out price, payment structure (cash, deferred, earn-out), what’s included, timetable, exclusivity and confidentiality. The clearer your HoTs, the fewer surprises in drafting.

3) Legal And Financial Due Diligence

Request a data room and work through priority areas: financials, contracts, people, IP, data protection, property and regulatory. Use your diligence findings to refine price and target protections.

4) Draft And Negotiate The Agreements

Your sale agreement, disclosure letter and ancillary documents should reflect the deal you think you’re doing. Push for appropriate warranties, a sensible indemnity package, and practical conditions precedent (e.g. critical consents).

5) Prepare For Completion

Line up landlord and key counterparty consents, bank accounts, insurances, board minutes, filings and transition communications. A coordinated completion checklist helps everyone stay on track.

6) Post-Completion Actions

File necessary Companies House forms, settle stamp duty, update registers, notify regulators, and switch over utilities and services. Begin your 100-day plan to integrate teams, systems and branding without disrupting customers.

Common Risks And How To Reduce Them

Undisclosed Liabilities

Risk: unpaid tax, employment claims, product liabilities or regulatory breaches emerging after completion.

Mitigation: robust due diligence, targeted indemnities, escrow or retention, and a clear claims process with caps and time limits.

Key Contract Terminations

Risk: a major customer or supplier exercises a change of control termination right.

Mitigation: identify critical contracts early, obtain consents as conditions to completion, and consider price adjustments or earn-out tied to retention.

Lease Issues

Risk: delayed landlord consent or unexpected dilapidations costs.

Mitigation: engage the landlord early, review repairing obligations, agree side letters where needed, and ensure consent wording is acceptable.

People And Culture

Risk: loss of key staff or culture clash that harms performance.

Mitigation: retention packages, clear communication, and appropriate restrictive covenants and handover obligations in the sale documents; consider a Directors Service Agreement if founders remain post-sale.

Data And IP Gaps

Risk: missing assignments, shared codebases or non-compliant data practices.

Mitigation: verify IP chain of title, complete formal assignments for brand and content, and align GDPR documentation - including a live Privacy Policy on all customer-facing channels.

Frequently Asked Legal Questions When You Purchase A Company

Will TUPE Apply?

If you’re buying a business as a going concern (common in asset deals), TUPE often applies and employees transfer automatically with their rights intact. You must inform and consult affected staff and respect terms and continuity of service.

Do I Need CMA Approval?

Most small and mid-market deals do not require UK merger clearance. However, be careful with information sharing during diligence - use clean teams or redactions where sensitive competitive data is involved.

What About Tax?

Tax treatment can differ significantly between share and asset deals (e.g. stamp duty on shares vs potential VAT and asset-specific taxes). Coordinate early with your tax adviser and reflect any tax-sharing arrangements in the sale agreement.

Can The Seller Work In A Competing Business After Completion?

Reasonable restrictive covenants (non-compete, non-solicit, non-deal) are commonly included to protect the goodwill you’ve purchased. These should be tailored to geography, duration and scope to increase enforceability.

How Do I Protect Against Known Risks?

In addition to warranties, negotiate specific indemnities for identified issues (for example, an ongoing dispute or a historic compliance gap) and consider holdbacks or escrow until a risk matures or is resolved.

Key Takeaways

• Choose the right structure: a share purchase offers continuity but carries legacy liabilities; an asset purchase lets you cherry-pick value but needs more consents and careful TUPE planning.
• Prioritise due diligence: test financials, contracts, employment, IP, data protection, property and regulatory compliance - and map findings to warranties, indemnities and price.
• Get the right documents in place: your Share Sale Agreement or Business Sale Agreement, disclosure letter, novations, lease assignments and TUPE paperwork are your protection from day one.
• Plan operations: line up supplier and landlord consents, prepare comms for staff and customers, and make post-completion filings promptly to keep the transition smooth.
• Manage risk commercially: use retentions/escrow, tailored indemnities, and realistic restrictive covenants; make critical consents conditions to completion.
• Don’t DIY the legals: bespoke drafting and a focused legal due diligence process can prevent disputes and protect value long after completion.

If you’d like help to purchase a company - from due diligence and deal structure through to drafting a Share Sale Agreement or Business Sale Agreement - you can reach us on 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.