Share Sale Process and Risks for UK Companies (2026 Update)

Selling shares in a UK company can be a great way to realise value, bring in a new investor, or hand over the reins without shutting the business down.

But share sales can also get complicated quickly - especially once you factor in warranties, disclosures, Companies House filings, tax, and what happens to employees and commercial contracts after the deal completes.

This guide walks you through what a share sale is, how the process usually works, and the legal documents you'll typically need to protect yourself (and keep the deal on track) in 2026.

What Is A Share Sale (And How Is It Different To An Asset Sale)?

A share sale is where the owner(s) of a company (the shareholders) sell some or all of their shares to a buyer. The company stays the same legal entity - but its ownership changes hands.

This is different to an asset sale, where a buyer purchases specific business assets (like equipment, stock, contracts, IP, or goodwill) and usually leaves the company itself behind.

Why Share Sales Are Popular

Share sales are common because they can be simpler commercially. The buyer "steps into the shoes" of the shareholder and takes over the company as-is - including its:

• contracts and supplier relationships
• employees
• intellectual property
• liabilities (including historic liabilities)
• assets and cash

That last point (liabilities) is the big one. Because the company continues, the buyer usually takes on the company's existing risks too - which is why buyers often push hard on due diligence, warranties, and disclosure.

When An Asset Sale Might Be Better

Asset sales can sometimes be more attractive where:

• the buyer only wants certain parts of the business (not the whole company)
• the seller wants to "ringfence" liabilities within the existing company
• there are complex shareholder arrangements that make a share transfer difficult

Which structure is "best" depends on the deal, the tax position, and what risks each side is willing to accept - so it's worth getting tailored advice early rather than trying to retrofit the paperwork later.

How Does A Share Sale Work In Practice?

Most share sales follow a similar journey, even if the company (or purchase price) is small. Here's the usual flow.

1) Heads Of Terms (Agree The Deal In Principle)

Heads of terms (sometimes called a term sheet) is where you outline the key commercial points, like:

• purchase price and payment structure (upfront, deferred, earn-out)
• what percentage of shares are being sold
• exclusivity period (if any)
• key conditions (for example, finance approval)
• target timeline

Heads of terms are often "non-binding" (except for confidentiality and exclusivity), but they're still important because they frame everything that comes next. If you get this stage wrong, you'll usually feel it later during negotiation of warranties and price adjustments.

2) Due Diligence (The Buyer Checks What They're Buying)

Due diligence is the buyer's investigation into the company. They'll typically review:

• company structure and share capital
• material contracts (customers, suppliers, landlords, lenders)
• employment matters and policies
• intellectual property ownership
• financial records and tax filings
• ongoing disputes or regulatory issues

In 2026, you can expect buyers to ask more questions around identity, ownership and governance too, particularly as Companies House continues to tighten data and verification expectations under ongoing reforms.

3) Sale Agreement Drafting (Turning The Deal Into Enforceable Terms)

This is where the legal work really happens. The main contract is usually a Share Purchase Agreement (SPA), supported by disclosure, resolutions, and completion documents.

For most transactions, having a properly drafted Share Sale Agreement is essential - because it's the document that sets out what's being sold, for how much, on what terms, and what happens if something later turns out to be untrue.

4) Completion (Money Changes Hands, Shares Transfer)

At completion, you'll typically:

• execute the SPA
• transfer shares (often using a stock transfer form)
• pay the purchase price (or initial amount)
• update statutory registers (register of members, PSC register where relevant)
• make relevant Companies House filings

Depending on the deal, completion might happen at the same time as signing, or there may be a gap if there are conditions to satisfy first (for example, obtaining third-party consents).

5) Post-Completion (The "Admin" That Still Matters)

After completion, there's usually a list of practical steps that protect both sides, including:

• confirming director appointments/resignations
• handing over company records, passwords, and banking access
• notifying key stakeholders (where appropriate)
• dealing with any deferred consideration milestones

This stage is often overlooked - but it's where misunderstandings can trigger disputes. A clean completion checklist can make the handover much less stressful.

What Legal Documents Do You Need For A Share Sale?

Every share sale is different, but there are a few documents that come up again and again.

Share Purchase Agreement (SPA)

The SPA is the main contract. It usually covers:

• what shares are being sold (and confirmation the seller owns them)
• purchase price and how/when it's paid
• warranties (promises about the company's condition)
• limitations on liability (caps, time limits, and exclusions)
• conditions (if completion is conditional)
• restrictive covenants (to stop the seller competing or poaching staff)

Limitations on liability are a major negotiation point in SPAs - and they need to be drafted carefully so they're actually enforceable and reflect the commercial risk allocation. It's the same principle you see in well-drafted limitation of liability clauses in other business contracts, but typically more bespoke because the stakes are higher.

Disclosure Letter (And The Disclosure Bundle)

Warranties in an SPA are often "qualified" by disclosure. In plain English: the seller lists what the buyer should know, so the buyer can't later claim they were misled.

For example, if the SPA says "there is no litigation", but there's a small threatened claim, you'd disclose it. Done properly, disclosure is one of the best tools a seller has to reduce the risk of a post-sale claim.

Board And Shareholder Resolutions

You'll often need resolutions to:

• approve the share transfer
• approve new directors and resigning directors
• waive pre-emption rights (if your constitution or shareholders agreement requires it)

These approvals often depend on what your existing shareholder arrangements say. If the company has a Shareholders Agreement, it may include restrictions on transfers, rights of first refusal, or drag/tag provisions that dictate how (and whether) you can sell.

Stock Transfer Form And Stamp Duty

A stock transfer form is typically used to evidence the transfer of shares.

Where the consideration for the shares exceeds the relevant threshold, stamp duty may be payable by the buyer (and the stock transfer form may need stamping). The rules can be technical, particularly where the price is structured as deferred consideration or earn-out, so it helps to understand the basics of stamp duty on shares early in the process.

Deeds Of Release, Settlement, Or Assignment (Sometimes)

Depending on the company's history, you might also need supporting documents, such as:

• settlement deeds if there are existing shareholder disputes
• releases if the seller is resigning as a director and there are mutual claims to close out
• assignments if assets need to be moved into the company pre-sale (for example, IP owned personally)

Assignments are particularly common where the company doesn't clearly own the IP it uses. If you're cleaning up ownership pre-sale, it's worth understanding what a Deed of Assignment does and why buyers care so much about it.

What Are The Biggest Legal And Commercial Risks In Share Sales?

Share sales aren't just about agreeing a price. The biggest risks usually sit in the fine print - and they're very "fixable" if you identify them early.

Warranties And Post-Sale Claims

From a seller's perspective, warranties are where you can accidentally take on long-term risk after you've already sold.

From a buyer's perspective, warranties are often their main remedy if the company isn't what they thought they were buying.

Common warranty hot spots include:

• tax and HMRC compliance
• employment status issues
• ownership of intellectual property
• undisclosed debts or liabilities
• contract disputes (including customer refunds and service complaints)

A good disclosure process and sensible limitations (caps, time limits, knowledge qualifiers) are usually the difference between a clean exit and a stressful post-sale dispute.

Debt, Director's Loans, And Hidden Liabilities

Because the company continues after a share sale, any debts stay with it - including informal arrangements that weren't properly documented.

This can include director's loans or shareholder loans that may need to be repaid, waived, or restructured before completion. If the company has been funded through loans (rather than shares), it's worth checking how shareholder and director loans are documented and whether there are repayment triggers linked to a change of control.

Contract Change-Of-Control Clauses

Even though the company itself isn't changing, many commercial contracts treat a share sale as a "change of control". That can trigger:

• a requirement to notify the other party
• a requirement to get consent before completion
• a termination right

This is particularly common in leases, major supplier agreements, franchise arrangements, and finance documents. If these consents aren't managed properly, you can end up with a deal that completes - but a key contract that falls away immediately after.

Restrictive Covenants (Non-Compete And Non-Solicit)

Buyers often want the seller to agree that they won't compete, poach employees, or solicit customers for a period after completion.

These clauses need to be reasonable to be enforceable. Too broad, and you risk them being challenged. Too narrow, and the buyer may feel unprotected and reduce the price.

The "right" balance depends on your role in the business, the market, and how the buyer values goodwill.

What Happens To Employees When A Company Is Sold Via A Share Sale?

This is one of the most common questions we see - and it's important to get it right because people issues can derail a deal.

In a typical share sale, the employer doesn't change. The company remains the same legal entity, just with new shareholders. So employees usually continue on their existing contracts with no need to transfer employment (unlike many asset sales where TUPE may apply).

That said, there are still key practical and legal considerations:

• Employee communications: even if contracts don't change, the workforce may need reassurance about continuity and management changes.
• Incentives and bonuses: share options, commission schemes, and bonus plans may need to be reviewed before completion.
• Management changes: if directors are leaving and new directors are stepping in, there can be operational disruption unless the handover is planned.

If the deal involves selling the business and changing how staff will be managed, it's worth considering employee rights and risk points that often arise when selling your business more broadly.

And if the buyer plans to change terms after completion (for example, commissions, reporting lines, or senior roles), getting those changes documented properly is crucial to reduce disputes down the track.

Key Takeaways

• A share sale transfers ownership of a company by selling shares, while the company itself continues - including its contracts, employees, assets, and liabilities.
• Most share sales follow a similar process: heads of terms, due diligence, drafting the SPA and disclosure, completion, then post-completion handover and filings.
• The Share Purchase Agreement is the core legal document and usually deals with price, warranties, disclosure, restrictions, and limitations on liability.
• Disclosure is a practical risk-management tool for sellers - it helps prevent warranty claims by making sure the buyer is informed before completion.
• Common deal risks include hidden liabilities (including director/shareholder loans), change-of-control clauses in key contracts, and overly broad or weak restrictive covenants.
• In most share sales, employees typically remain employed by the same company, but communications and any planned post-sale changes should be handled carefully.

If you'd like help selling shares in a company (or buying into one) and want the legal side done properly, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.