How To Sell Shares In A Private Company In The UK

Thinking about selling shares in your limited company? Whether you’re bringing in a new investor, letting a co-founder exit, or tidying up your cap table, it’s a big step that comes with specific legal hoops under UK law.

The good news: with a clear process and the right documents, you can complete a clean, compliant share sale and stay protected as your business grows.

When Can A Small Business Sell Or Transfer Shares?

In a private company, shares can move hands for several common reasons. From a small business perspective, the usual scenarios include:

• Founders or early investors taking some cash off the table (a partial exit).
• Bringing in a strategic investor to fund growth.
• An employee or co-founder leaving and selling their stake.
• A management buy-in/buy-out.
• Group restructuring or moving shares between related parties.

Before you go too far, check two places that govern what you can and can’t do with your shares:

• Your company’s Articles of Association - this is your company’s constitution and often contains critical rules on pre-emption, transfer restrictions, consents and director powers.
• Your Shareholders Agreement - many private companies include rights like rights of first refusal (ROFR), tag-along, drag-along and approval thresholds that must be followed on a share sale.

These documents usually set out who needs to approve a sale, who gets first dibs on the shares, and how to handle pricing and disputes. Not following them can delay your deal or even make a transfer invalid.

Selling Existing Shares Vs Issuing New Shares

There are two very different ways to bring someone onto your cap table:

1) Selling Existing Shares (a “Secondary” Sale)

Here, an existing shareholder sells their shares to a buyer. The company’s total number of shares stays the same (the ownership just changes hands). In most cases, the buyer pays Stamp Duty on the transfer if the consideration is over £1,000.

If you’re leading the transaction, you’ll usually document it with a tailored Share Sale Agreement, plus board and (if needed) shareholder approvals.

2) Issuing New Shares (an “Allotment” or “Primary” Issue)

This increases the total number of shares, diluting existing shareholders unless they also take part. The company receives the funds. You must comply with any pre-emption rights on new issues, pass appropriate resolutions, and file an SH01 with Companies House within one month of allotment.

Issuing new shares raises accounting and legal points around share capital and share premium. If you’re weighing up a buyback instead of a third-party purchase, also consider the process for redeeming shares and the specific Companies Act rules that apply.

Step-By-Step: How To Sell Shares In A Private Company

Every deal is different, but most small business share sales follow a similar path under the Companies Act 2006 and your company’s internal rules.

1) Check Your Company Rules

Pull out your Articles and any Shareholders Agreement. Confirm transfer restrictions, approvals required, pre-emption processes and any ROFR arrangements. Clarify who has authority to approve a transfer (often the board) and whether any special thresholds apply for shareholder consent.

2) Agree Heads Of Terms

Summarise the commercial points (price, number/class of shares, timing, completion conditions, any earn-out or deferred consideration). Heads of Terms are usually non-binding, but help you move efficiently into legals and due diligence.

3) Run Proportionate Due Diligence

For a smaller internal transfer, diligence might be light. For third-party investors, expect at least basic checks on company ownership, key contracts, IP, finance and litigation. This is your chance to present clean records and reduce the risk of price chipping or post-completion disputes.

4) Prepare Your Legal Documents

For a secondary sale, the core document is a Share Sale Agreement (SSA). You’ll also need a stock transfer form (J30 for fully paid shares), board/shareholder resolutions, updated registers, and a new share certificate for the buyer post-completion.

5) Approvals And Sign-Off

Follow your approval mechanics precisely. In many companies, the board must approve the transfer and the registration of the new shareholder. Where the Articles or Shareholders Agreement require wider shareholder consent, get that vote in the right format (ordinary or special) and minute it properly. This is where clear board resolutions and, where relevant, special resolutions matter.

6) Complete And Update Your Registers

On completion, money changes hands and the seller delivers the signed stock transfer form. The board resolves to register the transfer, the company updates the register of members and PSC register (if affected), issues a new share certificate to the buyer, cancels the seller’s certificate, and stores everything in the minute book.

7) Pay Stamp Duty (If Applicable)

If consideration exceeds £1,000, the buyer pays 0.5% Stamp Duty to HMRC and gets the stock transfer form “stamped” electronically. Timing matters - penalties and interest can apply for late payment. You can read more about thresholds, payment and timing under Stamp Duty on shares.

8) Notify Companies House (If Needed)

There’s no immediate filing just for a transfer, but you do need to keep your Companies House records up to date. Changes to PSC details must be recorded in your own register within 14 days and notified to Companies House within a further 14 days. New share allotments (not transfers) require an SH01 within one month.

It’s easy to miss a step when you’re busy running the business - consider having a lawyer manage the Share Transfer process end-to-end so your approvals, registers and filings are spot on.

Approvals, Registers And Companies House Requirements

Private companies have a few moving parts to get right when shares change hands.

Approvals

• Board approval to register any transfer and to issue replacement share certificates.
• Shareholder approvals where required under Articles or a Shareholders Agreement (e.g. waiving pre-emption, ROFR, or approving a restricted transfer).
• Ordinary vs special resolution - check thresholds and notice. Some matters may require a 75% vote.

Registers And Certificates

• Update the register of members with the new shareholder’s details and date of entry.
• Update the PSC register if control thresholds change (e.g. someone moves above/below 25% ownership or voting rights).
• Issue a new share certificate to the buyer; cancel the seller’s certificate.

Companies House

• Notify PSC changes within statutory timeframes.
• File SH01 for new share allotments (not required for transfers).
• Reflect cap table changes in the next Confirmation Statement.

Strong governance and tidy records are not just “nice to have” - they de‑risk the sale and make future funding rounds smoother.

What Should Your Share Sale Documents Cover?

For a clean exit or investment, your documents should be tailored to your business, deal type and risk profile. Typical items in a private company Share Sale Agreement include:

• Parties, subject shares and price - including any deferred or earn-out mechanics.
• Conditions precedent - approvals, financing, lease consents, third-party waivers, or confirmatory steps before completion.
• Warranties - statements by the seller (and sometimes the company) about ownership of the shares, no encumbrances, accounts, contracts, IP, employees, disputes and compliance. Expect limitations (time, caps, baskets).
• Indemnities and tax covenant - bespoke cover where a specific risk has been identified, and a tax covenant for historic liabilities in some deals.
• Restrictive covenants - non-compete, non-solicit and confidentiality commitments to protect the company’s value post-sale.
• Completion deliverables - board minutes, stock transfer forms, updated registers, share certificates and any ancillary documents.
• Dispute resolution, governing law and notices - practical boilerplate that still needs to be correct.

If you’re the company (rather than the individual seller) coordinating the process, make sure the final SSA aligns with your internal rules and any investor protections already in place. You can also combine the SSA with updates to your Shareholders Agreement if your investor is coming on board with new rights or consents.

Avoid using generic templates - getting a Share Sale Agreement professionally drafted saves headaches later, especially around warranties, covenants and completion mechanics.

Tax, Price And Valuation Considerations

The numbers matter - and small gaps in understanding can be costly.

Valuation

Agreeing price is often the hardest part. Some deals use a simple fixed price. Others use completion accounts or a “locked box” to deal with cash, debt and working capital. If you need a framework to set or defend a fair price, this primer on how to value your company shares can help you decide on a sensible approach for SMEs.

Tax

• Stamp Duty: The buyer usually pays 0.5% on consideration over £1,000 for share transfers.
• CGT for Sellers: Sellers may have Capital Gains Tax exposure. Business Asset Disposal Relief may be available in some cases, but it depends on the facts - get advice from your accountant or tax adviser early.
• Allotments vs Transfers: New share issues don’t trigger Stamp Duty for the subscriber, but do have filings and possible accounting effects on share premium.

If you’re a founder considering liquidity, it’s worth reading through the high-level factors around selling your own shares before you commit to a structure and timeline.

Common Mistakes (And How To Avoid Them)

• Skipping your constitutional documents: Not checking Articles and the Shareholders Agreement can derail the deal. Always confirm pre-emption, ROFR and approval pathways upfront.
• Unclear approvals: If you need shareholder consent, choose the right approval type and record it correctly - incorrect resolutions can invalidate the transfer.
• Light-touch documents: Under-cooked warranties or missing restrictive covenants can leave the company exposed after the sale.
• Forgetting registers and PSC updates: Your legal change isn’t complete until the registers are accurate, certificates are issued and statutory updates are handled.
• Stamp Duty delays: Late payment leads to penalties and can slow down post-completion admin such as future transfers.
• Price mechanism mismatches: If you’ve agreed “cash free, debt free” but your documents don’t explain how that’s measured, expect friction. Align commercial terms with the SSA drafting.

If this feels like a lot, don’t worry - once you’ve done it the right way once, your playbook is set for future deals.

Key Takeaways

• Decide whether you’re selling existing shares (a transfer) or issuing new shares (an allotment) - the process, filings and tax impact differ.
• Check your Articles and any Shareholders Agreement for pre-emption, ROFR, drag/tag and approval requirements before you start.
• Follow a clear process: heads of terms, proportionate due diligence, a tailored Share Sale Agreement, board/shareholder approvals, completion and post-completion admin.
• Keep governance tight: pass the right resolutions, update registers and PSC details, handle share certificates, and make any necessary Companies House filings on time.
• Cover the essentials in your documents - price and mechanics, warranties, tax covenant (where relevant), restrictive covenants and completion deliverables.
• Plan for valuation and tax early: agree a sensible price mechanism and get tax advice; ensure Stamp Duty is budgeted and paid promptly.

If you’d like help with a Share Transfer, a bespoke Share Sale Agreement, or aligning your Articles and Shareholders Agreement with your deal, our team can guide you through the process. You can reach us on 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.