Guillaume Ⓥ Sarlat

Investment Banker, Investor & Board Member

📍 United Kingdom🔄 Updated September 2026💼 7 investments📅 11 years investing🗓 Last invested Apr 2026
VC🌍 United KingdomInvested this year
7
Total investments
1
Early stage
1
Mid stage
1
Late stage
11y
Years active

Portfolio

6 investments · sorted by recency
All investments
Early stage
Mid stage
Late stage
Board Member, Investor
Apr 2026
Exergy3 is clean-tech spinout from the University of Edinburgh. We are developing and commercialising a novel form of ultra-high temperature energy storage technology. We use this technology to decarbonise industrial processes, district heating systems and combined heat and power. To find out more, join our mailing list: getintouch@exergy3.com
Board Member, Investor
2023
Sweetch Energy is a renewable energy company specialising in osmotic energy, and committed to a carbon neutral world. Our INOD® technology enables the production of clean and competitive electricity from salt water, a permanent and abundant source of energy yet untapped. Driven by a desire to expand the frontiers of renewable energy, our multicultural and highly qualified team combines scientific expertise and industrial vision. Sweetch Energy benefits from the support of many renowned European and French institutions. It is financially supported by deeptech and climate-tech investors (Go Capital, Demeter Ventures, Future Positive Capital) as well as by the BPI and ADEME, and cooperates closely with French research institutions, in particular teams led by Professor Lydéric Bocquet (CNRS, ENS). Sweetch Energy won the Mondial Innovation, I-Nov and I-Lab competitions and participated in the European Nanophlow consortium founded by H2020 as part of the FET-Open programme.
Board Member, Investor
2022
Buy or rent a solar system for your rooftop? There’s a better way! Sunvigo offers you a solar system for free combined with a flexible electricity contract. You only pay for what you actually use. And Sunvigo does the work. Learn more at www.sunvigo.de.
early stageUtilities
Board Member, Investor
2022
We make everyday products safe and sustainable. We aim to end chemical pollution in consumer products by replacing harmful petro-based ingredients.
Board Member, Investor
2021
The UK is undergoing a once-in-a-generation energy transition. This unique market is created by the phasing out of coal, nuclear and large-scale gas plants at the same time as exponential growth in renewables. This change is creating a totally new power requirement in the UK with large-scale renewables needing support from energy storage and flexible generation. Development of flexible and smart infrastructure is critical to support the UK’s targets to decarbonise. IBNE is a commercially responsible energy company that is capitalising on the exponential growth in supporting the transition to net zero, enabling renewables deployment. We are at the forefront of this transition with our flexible generation potential and are currently developing more than 500MW of assets with another 1.5GW under appraisal.
Board Member, Investor
2021
B–ON is a leading provider of electric vehicles, smart productivity-enhancing tools, and electric solutions for commercial fleets. With seasoned employees working together across Europe, Asia, and North America, B–ON is focused on creating SPACE in cities with productive and all-electric commercial transportation solutions. For more information, check us out on our website at www.b-on.com.
Experience · 12 entries
All (12)
Investments (7)
Founder (1)
Board (7)
2026
Board Member, Investor
Apr 2026
Exergy3 is clean-tech spinout from the University of Edinburgh. We are developing and commercialising a novel form of ultra-high temperature energy storage technology. We use this technology to decarbonise industrial processes, district heating systems and combined heat and power. To find out more, join our mailing list: getintouch@exergy3.com
2023
Board Member, Investor
2023
Sweetch Energy is a renewable energy company specialising in osmotic energy, and committed to a carbon neutral world. Our INOD® technology enables the production of clean and competitive electricity from salt water, a permanent and abundant source of energy yet untapped. Driven by a desire to expand the frontiers of renewable energy, our multicultural and highly qualified team combines scientific expertise and industrial vision. Sweetch Energy benefits from the support of many renowned European and French institutions. It is financially supported by deeptech and climate-tech investors (Go Capital, Demeter Ventures, Future Positive Capital) as well as by the BPI and ADEME, and cooperates closely with French research institutions, in particular teams led by Professor Lydéric Bocquet (CNRS, ENS). Sweetch Energy won the Mondial Innovation, I-Nov and I-Lab competitions and participated in the European Nanophlow consortium founded by H2020 as part of the FET-Open programme.
Venture Partner
2023
Axeleo Capital is a Venture Capital firm specializing in early-stage investments across Europe in B2B Software and Greentech sectors. With a strong track record since its founding in 2017, Axeleo Capital empowers talented tech entrepreneurs to build ambitious, high-impact companies, driving innovation and sustainability. With a strong entrepreneurial DNA and led by a diverse and seasoned team in Paris, London and Lyon, Axeleo Capital currently manages €300M in assets and maintains an active portfolio of over 45 companies. Some of our portfolio highlights include companies such as Alsid (acquired by Tenable), Triver, Kestra, Sweetch Energy, Adagio and Trustpair. Discover more about us at www.axc.vc Startups founders: apply@axc.vc LPs & Investors: development@axc.vc
2022
Board Member, Investor
2022
Buy or rent a solar system for your rooftop? There’s a better way! Sunvigo offers you a solar system for free combined with a flexible electricity contract. You only pay for what you actually use. And Sunvigo does the work. Learn more at www.sunvigo.de.
early stageUtilities
Operating Partner
2022
Sparta Capital Management Ltd is a London based alternative investment manager founded by Franck Tuil in 2021.
Show all 12 entries ↓
Investment activity
2015–2026 · 7 investments
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