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how to draft a seed investment agreement uk

How to Draft a Investment Agreement in the UK

If you're raising your first round and need to know how to draft a seed investment agreement UK founders can actually rely on, this guide walks you through every clause that matters. A seed investment agreement is the legal foundation of your relationship with an investor — it sets out how much they're putting in, what they get in return, and what protections sit on both sides. Get it wrong and you risk disputes over equity, control, or exit rights down the line. UK seed deals are typically governed by the Companies Act 2006 and general contract law principles, so the document needs to be precise, not just a template you found online. This guide covers what must be included, what's commonly missed, and where the real risks sit for early-stage UK founders. It's practical, not theoretical. And it's honest about when you need a solicitor rather than a document tool.

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Why this matters

Most founders raising a seed round have never drafted an investment agreement before. You're under time pressure, the investor wants docs quickly, and hiring a City law firm feels disproportionate for a £150k cheque. So you either use a template you don't fully understand, or you copy something from a friend's deal that may not reflect your structure at all. The result is an agreement with gaps — missing anti-dilution provisions, vague information rights, or no drag-along clause. These gaps don't hurt you today. They hurt you at Series A, or when a co-founder leaves, or when an investor blocks a decision they technically have the right to block.

The Atornee approach

Atornee lets you generate a seed investment agreement built around your specific deal — your company structure, investment amount, share class, and investor rights. You answer plain-English questions and get a document that reflects UK law, not a generic international template. It's not a replacement for a solicitor on a complex deal, and we'll tell you when you need one. But for straightforward seed rounds where you understand the terms and just need a clean, legally grounded document fast, Atornee cuts the time from days to minutes. You stay in control of the drafting without starting from a blank page.

What you get

A seed investment agreement structured for UK company law, covering share issuance, investor rights, and founder protections in one document
Plain-English clause explanations so you understand what you're signing, not just what it says
A checklist of deal-specific variables — valuation cap, discount rate, share class, board rights — so nothing gets missed before you send to the investor
Guidance on which clauses are standard and which are negotiating points, so you know where to push back
A document you can take to a solicitor for a focused review rather than a full drafting engagement, saving significant legal fees

Before you sign checklist

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1. Agree the headline commercial terms with your investor before drafting — valuation or valuation cap, investment amount, share class, and any board seat
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2. Confirm your company structure: is this a new share class, existing ordinary shares, or a convertible instrument like an ASA or SAFE?
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3. Check your existing articles of association for any pre-emption rights or consent requirements that affect the new issuance
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4. Decide on investor information rights — monthly accounts, annual audited financials, board observer rights — and agree these before the document is drafted
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5. Clarify founder vesting or good leaver/bad leaver provisions if the investor is requesting them, as these need to be reflected in the agreement
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6. Generate the agreement using Atornee, then review every defined term and schedule against your actual deal terms
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7. If the investment is over £250k, involves complex share rights, or the investor has their own legal team, instruct a UK solicitor to review before execution

FAQ

Does a seed investment agreement need to be witnessed or notarised in the UK?

No. A seed investment agreement is typically a simple contract and does not require a witness or notary under UK law. However, if it is executed as a deed — which some investors prefer for certain warranties — it does need to be witnessed. Check how the document is executed before signing.

What's the difference between a seed investment agreement and a shareholders' agreement?

A seed investment agreement governs the terms of the investment itself — what the investor pays, what shares they receive, and any conditions. A shareholders' agreement governs the ongoing relationship between all shareholders after the investment closes, covering things like decision-making, drag-along rights, and exit provisions. In practice, many seed deals combine both into one document or use the investment agreement to trigger an updated shareholders' agreement.

Can I use a US-style SAFE note for a UK seed round?

You can, but it creates complications. SAFEs are not natively recognised under UK company law and can cause issues at conversion, particularly around share class creation and Companies House filings. Most UK investors prefer an Advanced Subscription Agreement (ASA), which achieves a similar outcome but is structured for UK law. If your investor is US-based and insists on a SAFE, get UK legal advice before proceeding.

What investor protections are standard in a UK seed deal?

Standard protections at seed stage typically include: information rights (management accounts, annual financials), anti-dilution on a weighted average basis, pre-emption rights on future share issuances, and a pro-rata right to participate in future rounds. Drag-along and tag-along rights are also common. Anything beyond this — board veto rights, ratchets, liquidation preferences above 1x — is worth pushing back on at seed stage.

Do I need to file the investment agreement at Companies House?

The investment agreement itself is not filed at Companies House. However, the share allotment that results from the investment must be filed — you'll need to submit an SH01 form within one month of allotment, and update your PSC register if the investor acquires significant control. If you're creating a new share class, you'll also need to update your articles and file those.

When should I involve a solicitor rather than using a document tool?

Use a solicitor if: the investment is above £250k, the investor has their own legal team sending you their version of documents, the deal involves complex share rights or convertible instruments, or there are existing shareholders whose rights may be affected. For a straightforward seed round with a single angel investor and a clean cap table, a well-structured document tool combined with a focused solicitor review is a proportionate approach.

Related Atornee Guides

Cheap Contract Solicitor Alternative (UK)

Useful if you want to understand when a document tool is sufficient versus when to instruct a solicitor for your investment docs.

Cheap Solicitor for NDA (UK)

Most seed deals require an NDA before term sheet — pair this guide with your investment agreement workflow.

Atornee Use Cases

See how founders and operators use Atornee across different legal document types, including investment and commercial contracts.

External References

GOV.UK Business and Self-employed

Official guidance on UK company administration, share allotments, and Companies House filing obligations relevant to seed investment.

UK Legislation

Primary source for the Companies Act 2006 and contract law statutes that govern seed investment agreements in the UK.

Trust & Verification Policy

Authored By

A

Atornee Editorial Team

UK Investment Document Research

Reviewed By

C

Compliance Review Desk

UK Business Legal Content QA

Last reviewed on 3/4/2026

"This content is based on analysis of standard UK seed investment documentation, Companies Act 2006 requirements, and common drafting issues encountered by early-stage UK founders. It reflects practical patterns from angel and pre-seed rounds in the UK market."

References & Sources