How To Sell Your Company In The UK: A Legal Checklist

Selling your business can be exciting, stressful, and (if you’ve never done it before) a bit of a black box.

When you search for how to sell a company, you’ll find plenty of advice on valuation and finding buyers - but the legal side is what often decides whether a deal actually completes, how much risk you keep after completion, and whether you walk away cleanly.

This guide is a practical legal checklist for small businesses and startups in the UK. We’ll break down the key legal steps, common pitfalls, and the documents you’ll usually need - in plain English - so you can go into the process prepared and protected.

What Does “Selling A Company” Mean (And What Are Your Main Options)?

Before you decide how to sell your company, you need to be clear about what you’re actually selling.

In the UK, most sales fall into one of two structures:

1) Share Sale (Selling The Company Itself)

If you run a limited company, a share sale means the buyer purchases your shares from you (and any other shareholders). The company stays the same legal entity - with the same contracts, staff, assets, liabilities, and history - but it has new owners.

Why buyers often prefer it: in many cases it can be operationally smoother because the company continues to hold its contracts and assets, and trading can continue without needing to transfer each asset individually.

Why sellers need to be careful: you’ll usually be asked to give warranties and indemnities about the company’s past (more on that below).

If you have multiple shareholders, your Shareholders Agreement may include “right of first refusal”, “drag-along” or “tag-along” rights, and other rules that can shape (or restrict) how the sale can happen.

2) Asset Sale (Selling The Business Assets)

An asset sale means the company sells certain assets to the buyer - for example, equipment, stock, website/domain, customer lists, and intellectual property (IP). The buyer usually doesn’t automatically take on all liabilities.

Why sellers like it: you might be able to “carve out” liabilities and only sell what you want to sell.

Why it can be more work: you may need to transfer (or re-sign) customer/supplier contracts, assign IP, and deal with staff transfer issues.

Which Structure Is “Better” For Small Businesses And Startups?

There’s no universal answer - it depends on things like:

• Whether you have historic liabilities you want to ring-fence
• Whether key contracts can be transferred easily
• Whether the buyer is acquiring your team, your tech, your customer base, or all of the above
• Your tax position (always get tailored tax advice)

This is exactly why learning how to sell a company isn’t just about finding a buyer - it’s about choosing a structure that matches what you’re selling and what risk you’re willing to keep.

A Step-By-Step Legal Roadmap For How To Sell A Company

If you want a clear process to follow, here’s a high-level roadmap that covers what usually happens in a UK company sale.

Step 1: Check You Have The Power To Sell

Start by checking your company’s internal documents:

• Who owns the shares (and are there minority shareholders who need to consent)?
• Do you need board approval and/or shareholder approval?
• Are there transfer restrictions in your Company Constitution (articles of association)?
• Are there investor consent rights (common in startups)?

This step is often overlooked - and it can delay a sale at the worst possible time (right when you’re trying to exchange).

Step 2: Protect Confidential Information Before You Share It

Most buyers will ask for a lot of commercially sensitive information (financials, pipeline, customer contracts, code base, supplier pricing).

Before you hand over a data room, consider putting confidentiality protections in place and setting clear boundaries around what you share and when. This is especially important if the buyer is a competitor or “strategic” buyer.

Step 3: Prepare For Due Diligence

Due diligence is where the buyer reviews your company to understand what they’re buying and what risks they’re taking on.

You can treat due diligence as a defensive exercise (“answer questions as they come”), or a proactive one (“prepare your records so fewer issues come up”). Proactive is almost always smoother.

If you want the process to run faster and with fewer surprises, a Legal due diligence package can help you identify and fix common issues before the buyer finds them.

Step 4: Negotiate Heads Of Terms (And Know What’s Binding)

Heads of terms (or a term sheet/letter of intent) typically sets out:

• Price and structure (share sale vs asset sale)
• Payment terms (upfront, deferred, earn-out)
• Exclusivity period
• Key conditions (e.g. buyer financing, third-party consents)

Even if the document says “non-binding”, some clauses (like confidentiality and exclusivity) can be binding. It’s worth getting advice here because the commercial deal you agree at this stage usually sets the tone for the final contract.

Step 5: Sign The Sale Documents And Complete Properly

The main contract for selling a business is often a Business Sale Agreement (for an asset sale) or a share purchase agreement (for a share sale).

Completion is not just “everyone signs and you’re done”. There are usually completion deliverables - board minutes, resignation letters, IP assignments, stock transfer forms, Companies House filings, and more - which should be managed with a clear Completion checklist.

Get Your House In Order: The Due Diligence Checklist Buyers Will Expect

When people ask how to sell a company, what they often mean is “how do I avoid the deal falling over?”. This is where housekeeping matters.

Here are the key areas buyers (and their lawyers) typically review.

Corporate Records And Ownership

• Up-to-date register of members (shareholders) and share certificates
• Confirmation statements and Companies House filings are accurate
• Director appointments/resignations properly recorded
• Any shareholder agreements, option agreements, or convertible instruments clearly documented

If your cap table is messy, you can expect delays, price renegotiation, or the buyer demanding more protections.

Customer And Supplier Contracts

• Signed copies of key customer and supplier agreements
• Terms and conditions (including online terms if you sell via a website)
• Change-of-control clauses (common in B2B contracts)
• Termination rights, notice periods, and any service level commitments

In an asset sale, check whether contracts can be assigned at all - some require consent, and some prohibit assignment entirely.

Intellectual Property (IP) Ownership

For many startups, the “company” is really the IP: the brand, code, content, product designs, processes, and know-how.

Buyers will usually want to see evidence that the company owns the IP it relies on. A common problem is IP created by founders or contractors without a proper assignment.

If there’s any doubt about IP ownership, you may need an IP Assignment to formally transfer rights into the company before the sale (or as part of completion).

Employment And Contractor Arrangements

Buyers will look closely at:

• Employment contracts and policies
• Contractor agreements (and whether contractors could claim worker/employee status)
• Confidentiality and IP clauses for staff and contractors
• Disputes, grievances, or threatened claims

If you’re selling assets, staff may transfer under TUPE (the Transfer of Undertakings (Protection of Employment) Regulations 2006). TUPE can create consultation obligations and restrict your ability to change terms - so it needs careful planning.

Even outside TUPE, having clear, signed Employment Contract documentation helps reduce uncertainty and makes due diligence smoother.

Data Protection And Privacy Compliance

If you hold customer data, marketing lists, or user analytics, your buyer will want comfort that you comply with UK GDPR and the Data Protection Act 2018.

In a sale, you may be sharing personal data during due diligence, and you may be transferring personal data to the buyer at completion. That’s not automatically prohibited - but it needs to be handled carefully, with a clear legal basis and sensible safeguards.

Regulatory, Licences, And Key Assets

• Any sector-specific licences (and whether they transfer on a share sale/change of control, or whether you’ll need a new application/notification)
• Leases or property arrangements
• Ownership of domains, websites, and social media accounts
• Insurance policies and claims history

The more you can organise into a clean data room, the faster the buyer can get comfortable - and the less likely they are to ask for aggressive legal protections.

Negotiating The Deal: Price, Risk, Warranties, And Earn-Outs

Once a buyer has done enough due diligence to keep moving, the negotiation usually turns to two big themes: money and risk.

Purchase Price And Payment Terms

Small business and startup deals often include:

• Upfront payment (the cleanest option for sellers)
• Deferred consideration (paid in instalments over time)
• Earn-outs (extra payments if the business hits future targets)
• Retention/escrow (a portion withheld to cover claims)

If any of the price is deferred or conditional, you’ll want the agreement to be very clear about:

• How performance is measured (and who controls the numbers)
• When payments are due
• What happens if the buyer changes the business model post-sale
• Your remedies if they don’t pay

Warranties And Indemnities (Where Sellers Often Get Caught)

Warranties are promises you give about the state of the business (for example, that accounts are accurate, there’s no hidden litigation, IP is owned by the company, and key contracts are valid).

If a warranty turns out to be untrue, the buyer may have a claim against you.

Indemnities are usually stronger protections for the buyer (often used for specific known risks), and they can operate on a pound-for-pound reimbursement basis.

For founders, this matters because you might think you’re “selling and walking away”, but badly negotiated warranties/indemnities can keep you financially exposed long after completion.

Limiting Your Liability (So You Don’t Sell And Still Carry The Risk)

Common ways to limit seller risk include:

• Disclosure: clearly disclosing known issues so the buyer can’t claim they were misled
• Caps: limiting your maximum liability (often linked to the purchase price)
• Time limits: limiting how long the buyer has to bring claims
• De minimis and basket thresholds: ignoring tiny claims and only allowing claims above a threshold

These points can feel “legalistic”, but they’re the practical tools that stop a good sale turning into years of follow-up disputes.

Third-Party Consents And Contract Transfers

If you need a landlord’s consent, a lender’s consent, or a key customer’s consent, build this into your timeline early.

In an asset sale, you may also need to transfer contracts properly. Sometimes that means a formal novation rather than a simple assignment - and that’s where a Deed of Novation is commonly used.

Completion And Post-Sale: What Happens After You Sign?

It’s tempting to think the job is done once the main agreement is signed.

In reality, completion and post-completion are where small administrative misses can create big headaches - especially if you’re trying to exit cleanly and move on to your next venture.

Completion Deliverables To Plan For

Depending on the deal structure, completion may require:

• Stock transfer forms and share certificates (share sale)
• Board minutes and shareholder resolutions
• Director resignations and new appointments
• Updates to Companies House (e.g. persons with significant control)
• Asset transfer documentation (asset sale)
• IP assignments, domain transfers, and handover of accounts
• Repayment of director loans or settlement of intercompany balances

This is why a detailed completion list matters - you want a clear record of what must happen, who does it, and when.

Restrictive Covenants And Founder Transition

Many buyers will ask founders to agree to restrictions after the sale, such as:

• Non-compete (not setting up a competing business for a period)
• Non-solicitation (not poaching customers or staff)
• Confidentiality obligations

Some restrictions are reasonable; some are too broad. The key is to keep them proportionate to the deal, your industry, and your future plans.

Handling Disputes If Something Goes Wrong

Sometimes disputes come up post-sale - for example, an earn-out disagreement, a warranty claim, or issues with transferred contracts.

It’s common to resolve these through a settlement arrangement rather than jumping straight into court. Where appropriate, a Deed of Settlement can help document the resolution clearly and reduce the risk of the dispute resurfacing later.

Don’t Forget Your Ongoing Obligations

Even after you sell, you might still have responsibilities depending on your deal, such as:

• Assisting with transition for a period (handover services)
• Continuing to keep information confidential
• Filing final tax returns or closing the company (if you sold assets and your company is no longer trading)

If you’re unsure what your obligations are, it’s better to clarify early than accidentally breach the sale agreement later.

Key Takeaways

• If you’re looking into how to sell a company in the UK, start by deciding whether you’re doing a share sale or an asset sale - the legal steps and risks can be very different.
• Check your internal governance documents early (especially your articles of association and any shareholder arrangements) to confirm who needs to approve the sale.
• Expect due diligence, and prepare for it: clean up corporate records, key contracts, employment documentation, IP ownership, and data protection compliance before the buyer finds issues.
• Negotiate warranties, indemnities, and liability limits carefully - a “successful sale” should mean you don’t carry open-ended risk after completion.
• Plan completion properly with a clear checklist, including any required consents, contract transfers/novations, IP assignments, and Companies House updates.
• If disputes arise post-sale, documenting outcomes clearly can prevent repeat issues and protect your clean exit.

If you’d like help with selling your company, getting your legal documents ready, or negotiating the terms so you’re protected, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.