Important information

Investments of this type carry risks to your capital and are illiquid in nature.

Tax reliefs depend on individual circumstances, may be subject to change and depend on the investee companies maintaining their qualifying status. Investments should only be made on consideration of the full information memorandum and the detailed risk factors contained therein.

Please click on the heading below that applies to you to select your investor type:

I am a High Net Worth Individual

I certify to the following HIGH NET WORTH INVESTOR STATEMENT:

If you meet condition A or B below, you may choose to be classified as a high net worth individual for the purposes of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005.

  • A) In the last financial year, you had annual income of £170,000 or more. Income does NOT include any one-off pension withdrawals.
  • B) Net assets of £430,000 or more. Net assets do NOT include: your home (primary residence), any loan secured on it or any equity released from it, your pension (or pension withdrawals) or any rights under insurance contracts. Net assets are total assets minus any debts you owe.

I declare that I have answered yes to A and/or B and wish to be treated as a high net worth individual.

I understand this means: a) I can receive financial promotions where the contents may not comply with rules made by the Financial Conduct Authority (FCA); b) I can expect no protection from the FCA, the Financial Ombudsman Service or the Financial Services Compensation Scheme.

I am aware that it is open to me to seek advice from someone who specialises in advising on investments.

I accept that I could lose all of the money that I invest.

I am a Financial Adviser

I confirm that I am an Independent Financial Advisor authorised and regulated by the Financial Conduct Authority.

I accept the terms and conditions.

I am a Self-Certified Sophisticated Investor

If you meet condition A, B or C below you may choose to be classified as a self-certified sophisticated investor for the purposes of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005.

Have you:

  • A) Worked in a professional capacity in the equity sector, or in the provision of finance for small and medium enterprises in the last two years?
  • B) Been the director of a company with an annual turnover of at least £1.6 million, in the last two years?
  • C) Been a member of a syndicate of business angels for more than six months, and are you still a member?

I declare that I have answered yes to A and/or B and/or C and wish to be treated as a self-certified sophisticated investor.

I understand that this means: a) I can receive financial promotions where the contents may not comply with rules made by the Financial Conduct Authority (FCA); b) I can expect no protection from the FCA, the Financial Ombudsman Service or the Financial Services Compensation Scheme.

I am aware that it is open to me to seek advice from someone who specialises in advising on investments.

I accept that I could lose all of the money that I invest.

I am a Restricted Investor

I make this statement so that I can receive promotional communications relating to non-readily realisable securities as a restricted investor. I declare that I qualify as a restricted investor because:

  • In the twelve months preceding today's date, I have not invested more than 10% of my net assets in non-readily realisable securities.
  • I undertake that in the twelve months following today's date, I will not invest more than 10% of my net assets in non-readily realisable securities.

Net assets for these purposes do not include: the property which is my primary residence or any money raised through a loan secured on that property; any rights under a qualifying contract of insurance; any benefits (in the form of pensions or otherwise) payable on termination of service or on death or retirement; or any withdrawals from pension savings (except where used directly for income in retirement).

I accept that the investments to which the promotions will relate may expose me to a significant risk of losing all of the money or other property invested. I am aware that it is open to me to seek advice from an authorised person who specialises in advising on non-readily realisable securities.

I am a Professional Investor

I confirm that I am a Professional Client as defined by the Financial Conduct Authority. I accept the terms and conditions.

Full risk summary →

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Don't invest unless you're prepared to lose all your money.
These are high-risk investments and you are unlikely to be protected if something goes wrong.
Take 2 mins to learn more
Fund X · Now Open

For individual investors

Carbon13
SEIS Fund X

Early-stage investment in the UK's most promising climatetech ventures for the 2026/27 tax year.

50%
Income tax relief
3x
Target return (net of fees)
£10k
Minimum investment
4–10
Portfolio companies

Reasons to invest

Why Carbon13 SEIS Fund X

🌍
Returns with purpose
Build a portfolio of pre-seed stage businesses developing the latest technologies to protect Earth's vital systems: materials, energy, food, built environment and beyond.
🛡
Comprehensive SEIS tax reliefs
Up to 50% income tax relief; no CGT on growth; 50% CGT reinvestment relief; inheritance tax relief after 2 years; plus loss relief protection. Tax treatment subject to status and change.
🧪
Carbon13 expertise
Carbon13 launched its first programmes in 2021. Its companies have gone on to raise up-rounds totalling more than £47m. A quarter of cohort participants hold PhDs and 63% of teams are mixed gender.

Our approach

We build ventures.
We don't just pick them.

Carbon13 builds and backs ventures addressing climate change. Over four years we've supported more than 1,500 founders and helped build over 300 climatetech startups from day zero across the UK and Europe.

50% of ventures are hardware-based, tackling some of the hardest problems in climate: energy, AI, the built environment, advanced materials, transport, carbon removal and food systems.

Fund X at a glance

Minimum investment£10,000
Average investment£25,000
Target raise£1.2m
Target return3x (net of fees)
Portfolio companies4–10 (preferred 8)
Deployment2026/27 tax year
Carry backTo 2025/26 normally possible
Investment managerSyndicate Room Ltd
Tax schemeSEIS

"Impact used to be nice to have but now it's a commercial edge."

Dr Nicky Dee, Co-founder & CEO, Carbon13

Investor community

Upcoming events

Join us at our upcoming webinars and events for prospective investors in Carbon13 SEIS Fund X.

The team

Who's behind the fund

Dr Nicky Dee
Dr Nicky Dee
Co-founder & CEO, Carbon13
Nicky has pioneered sustainability activities to scale up impact from startups, including work with UNEP, Nesta, Climate KIC and UK Gov. She has been an entrepreneur as well as working directly with founders and those who support them.
Perminder Dhillon
Perminder Dhillon
Principal, Carbon13
Min has extensive experience across partnership development, business strategy and go-to-market. Previously UK strategy lead at Eventbrite pre and post IPO. He manages Carbon13's fundraising activities and investor relationships.
Sara Jones
Sara Jones
Head of Marketing, Carbon13
Sara leads marketing and communications at Carbon13, shaping how the brand tells its story across investor, founder and partner audiences. With a background in content strategy and growth marketing, she brings clarity and creativity to the climatetech space.
Michael Langguth
Michael Langguth
Co-founder & Chief Strategy Officer, Carbon13
Michael is a serial entrepreneur. His most recent start-up, Poq, is a London-based SaaS platform for mobile shopping, powering the apps of some of the largest retailers in the world. He holds an MSc in Technology Entrepreneurship from UCL and is an active angel investor.

Tax relief benefits

What SEIS means for you

Tax treatment depends on individual circumstances and may be subject to change.

50%
Income Tax Relief
Claim up to 50% back on the amount deployed in investee companies in the year you invest, subject to income tax payable.
0%
CGT on Growth
No capital gains tax when SEIS qualifying investments are sold, provided shares are held for at least three years.
50%
Reinvestment Relief
Reinvest gains from other assets into SEIS and pay just 50% of the capital gains tax that would otherwise be due.
IHT
Inheritance Tax Relief
100% IHT relief under Business Relief after shares are held for 2+ years. Plus loss relief if an investment fails.

Follow-on investors in Carbon13 portfolio companies

Octopus Ventures Ada Ventures Cambridge Enterprise Planet A Ventures Pale Blue Dot Regeneration.VC Extantia Plug and Play SOSV

Get in touch

Interested in
SEIS Fund X?

Complete the form and our investment team will be in touch.

Please select below that applies to you to select your investor type

High-risk investment. You may lose all your capital. Tax reliefs subject to individual circumstances. Risk summary.