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For investors

Capital for the
Climate
Emergency.

We build and back Europe's most promising climatetech ventures. Whether you're exploring our SEIS Fund, interested in an LP position, or want to invest directly into one of our portfolio companies, we'd love to hear from you.

300+
Ventures built since 2021
£100m+
Raised by our ventures
4.1GtCO₂e
Net cumulative by 2060 across portfolio

Get in touch

Not sure what's right for you? Tell us a little about yourself and our investment team will be in touch.

We won't share your data. Privacy policy. This is a high-risk investment. Risk summary.

Investment pathways

Two ways to invest
with Carbon13

Each route is structured differently, with its own risk profile, tax treatment, minimum commitment and eligibility requirements. Select a pathway to learn more.

Tax Efficient · UK Investors · Fund X Closing Soon

SEIS Fund

Seed Enterprise Investment Scheme · Fund X closing soon

Tax-efficient exposure to a diversified portfolio of pre-seed climate ventures, built through our Venture Builder programme in Cambridge. For individual investors seeking both financial returns and measurable climate impact in the 2026/27 tax year.

  • Up to 50% income tax relief on your investment
  • Capital gains tax exemption after 3 years
  • Loss relief available if a venture fails
  • Minimum investment: £10,000
  • Managed by Syndicate Room
Explore SEIS Fund →
Institutional · Qualified Investors Only

LP Fund

Limited Partner · Carbon13 I SCSp

Our institutional fund vehicle for professional and sophisticated investors seeking portfolio-level exposure to the climatetech asset class. Structured as a Luxembourg SCSp, advised by Carbon13 Capital Limited.

Designed to focus follow-on capital on ventures showing the strongest progress from our programmes, from Pre-seed to Series A.

  • Diversified across UK, EU and Accelerator programmes
  • Proprietary dealflow, we build our startups
  • Luxembourg SCSp; its AIFM (AQ1443 Lux Sàrl) is advised in relation to the fund by Carbon13 Capital Limited, an Appointed Representative of an FCA-authorised firm
  • Qualified professional investors only
Explore LP Fund →

Interactive tool

Model a portfolio's
carbon J-curve.

An interactive model of a climatetech portfolio's cumulative carbon over time. Ventures emit while they're being built, before their technology abates at scale — so the curve dips into carbon debt, then climbs as the portfolio matures. Set the inputs to see how deep the debt runs, the year it breaks even, and its net position by 2050.

Try the tool →
Runs entirely in your browser.
No portfolio data is sent or stored.

Our edge

We don't source deals.
We build them.

Carbon13 is a venture builder first. Our investors access proprietary dealflow that no one else can offer, because we created it from scratch through our Venture Builder programmes in Cambridge and Berlin.

01
Proprietary Dealflow
We build our startups from scratch through our Venture Builder programmes. We invest before anyone else, at the earliest possible stage, with maximum information advantage.
02
Deep Domain Network
400+ domain experts in science, technology, industry and fundraising give every venture a structural advantage unavailable at any other fund of comparable size.
03
Impact with Commercial Scale
Every venture must demonstrate the potential to mitigate at least 10MtCO₂e per year at scale and/or other planetary boundaries of equal ambition. Impact is a filter, not a badge; it is built into every investment thesis.
04
Tier-1 Follow-ons
Octopus Ventures, Planet A, Pale Blue Dot, Ada Ventures and Cambridge Enterprise have all followed on into Carbon13 portfolio companies, independently validating venture quality.
4.1GtCO₂e
Net cumulative by 2060 across Carbon13 portfolio
300+
Ventures built since 2021
100+
Ventures invested in since 2021
£480m
Total portfolio market value
64%
Female co-founders

Investor community

Upcoming investor events

Webinars and in-person sessions for prospective investors. Meet the team, hear from founders, and get your questions answered before you commit.

See all events on Luma →

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

General enquiries

Not sure where
to start?

Whether you're exploring SEIS for the first time, considering an LP position, or simply want to learn more about our portfolio companies, our investment team is happy to help you find the right fit.

Send us a message

We won't share your data. Privacy policy. This is a high-risk investment. Risk summary.

The Venture Builder for the Climate Emergency.
Cambridge & Berlin.

Carbon13 Capital Limited (FRN: 953220) is an Appointed Representative of Thema Management Ltd, an FCA authorised and regulated entity (FRN: 978496), in relation to their role as investment advisor to Carbon13 I SLP. This website is not an offer to buy or sell securities and does not constitute a Direct Offer Financial Promotion. Applications for investment may only be made on the basis of the relevant documentation, copies of which are available on request. No reliance is to be placed on the information contained in this website in making such an application. Information herein is not intended to, nor should be taken to, constitute advice. Please note that the content and information provided on this platform may be confidential and for information and illustration purposes only. None of the documentation made available to you via this platform is legally binding, constitutes any financial or other obligations and must not be considered as legal, commercial or any other advice or recommendation by Carbon13 Group or any of its affiliates." © 2026 Carbon13, Salisbury House, Station Road, Cambridge, CB1 2LA. All rights reserved.