William Stewart

Private Aviation l UHNW Single-Family Office l Investor

📍 London, England Metropolitan Area, United Kingdom🔄 Updated September 2026💼 6 investments📅 10 years investing🗓 Last invested Jul 2016
VC🌍 United Kingdom
6
Total investments
2
Early stage
2
Mid stage
1
Late stage
10y
Years active

Portfolio

6 investments · sorted by recency
All investments
Early stage
Mid stage
Late stage
Investor
Jul 2016
🏆 "Best Investments Provider"​ - British Bank Awards 2018, 2019 & 2021. 🏆 "Most Innovative Provider"​ - Good Money Guide Awards 2019. 🏆 "Best Alternative Investment Account" - Good Money Guide Awards 2021. WiseAlpha is the UK’s leading digital corporate bond market. WiseAlpha provides Fractional Bond trading and automated portfolio services for individuals and institutions to gain exposure to the corporate bond asset class. ✉️ investing@wisealpha.com
Investor
Apr 2016
At Hybrid Air Vehicles we are encouraging customers to Rethink the Skies and consider new approaches to solving some of the toughest challenges facing aerospace today. Airlander can take off and land from virtually any flat surface and offers a powerful combination of flexibility, persistence, payload capacity, and efficiency. Airlander is the future of zero-carbon aviation. #RethinkTheSkies
Investor
Apr 2016
Clean. Instantly deployment. Easy to Use. Renovagen builds mobile, renewable hybrid power solutions that are reliable, rugged, silent and painlessly deployable, even in the most remote of locations. Renovagen takes solar power and energy storage where those have never gone before, enabling our peacekeeping, humanitarian and remote commercial customers to access clean, reliable power in remote sites with a reduced logistics burden and environment impact. Renovagen has a range revolutionizing cleantech accessories to be operated in remote locations including metal electrowinning and water prurification. Renovagen further provides protective coatings to keep existing or newly deployed PV systems operating at high yields in all environmental conditions throughout the system life cycle.
Investor
Apr 2016
At Powervault, we are on a mission to pioneer a sustainable energy future. We provide the most intelligent, economic and sustainable energy storage systems for homes and businesses. Our products store solar energy and affordable electricity from the grid, helping save you money while you help protect the environment. We design and manufacture Powervault here in the UK. In its initial market application the product stores ‘free’ electricity generated by solar panels during the day, then releases the stored energy during the evening when household demand peaks, delivering a 50% reduction on electricity bills. The initial addressable UK market of 1m solar PV owners is about to expand rapidly as regulation drives the roll out of smart meters enabling ‘smart tariffs’. This will allow any of the 26m UK homes to benefit from storing electricity when it is cheap to use at expensive ‘peak’ times.
Investor
Apr 2016
Power From Motion. Witt Limited: The developer behind technology known as the ‘WITT’. Enabling simple movements to be converted into electricity. Motional energy is all around us, on land, sea and in the air, and now there is a technology that can capture this motion and convert it into usable electrical power. How does the WITT convert all this motion into electricity? Contained within a sealed unit, WITTs utilize a 3D pendulum which drives the transmission system, converting all motion, in any combination of the six degrees of freedom, into a single unidirectional rotation of a flywheel, to produce electricity! WITT's harvest chaotic motion, fast, slow or erratic, turning into useable power. We have built prototypes to demonstrate how our technology can generate electricity from motion. We have used these prototypes to show our potential customers, engineering partners, agents, technology experts and global businesses how good the WITT is. These contacts share our excitement about what the WITT is able to achieve in terms of generating renewable power where it is needed and are engaging with us to bring our technology to market. The WITT is fully scalable from centimetres to metres thus offering a diverse range of products in the future with applications in many different markets. Please visit http://www.witt-energy.com for more information And checkout our social media platforms at: https://linktr.ee/witt_limited
Investor
Jan 2016
ONGallery brings you the art you like at prices you'll love, professionally framed and delivered to your door in 15 days; anywhere in the world. Search our online gallery and special collections for beautiful art that you'll enjoy every day
early stageFine Art
Experience · 8 entries
All (8)
Investments (6)
Founder (1)
2024
Co-Founder & CEO
Aug 2024
Everest Global Capital is a discreet, independent advisory and transaction partner serving High-Net-Worth and Ultra-High-Net-Worth individuals, family offices, and financial institutions. We specialise in the confidential acquisition and sale of high-value and legacy assets - from fine art and rare automobiles to strategic investments and private capital placements. Our team blends deep market expertise with legal, financial, and fiduciary insight, ensuring every transaction is managed with precision, and integrity. Discretion is our foundation, protecting individual legacies.
early stageCapital Markets
2022
Partnerships Coordinator
May 2022
VistaJet is the first and only global business aviation company, leading the industry by setting higher standards of service and safety for 20 years. On its fleet of silver and red business jets, VistaJet has flown corporations, governments and private clients to 187 countries, covering 96% of the world. Founded in 2004, the company pioneered an innovative business model where customers have access to an entire fleet whilst paying only for the hours they fly, free of the responsibilities and asset risks linked to aircraft ownership. VistaJet’s signature Program membership offers clients a bespoke subscription of flight hours with guaranteed access to the Vista Members’ fleet of global aircraft, to fly them anytime, anywhere. VistaJet is part of Vista — the world’s first private aviation ecosystem, integrating a unique portfolio of companies offering asset free solutions to cover all key aspects of business aviation.   20 years making private flying history. More VistaJet information and news at vistajet.com
2016
Investor
Jul 2016
🏆 "Best Investments Provider"​ - British Bank Awards 2018, 2019 & 2021. 🏆 "Most Innovative Provider"​ - Good Money Guide Awards 2019. 🏆 "Best Alternative Investment Account" - Good Money Guide Awards 2021. WiseAlpha is the UK’s leading digital corporate bond market. WiseAlpha provides Fractional Bond trading and automated portfolio services for individuals and institutions to gain exposure to the corporate bond asset class. ✉️ investing@wisealpha.com
Investor
Apr 2016
At Hybrid Air Vehicles we are encouraging customers to Rethink the Skies and consider new approaches to solving some of the toughest challenges facing aerospace today. Airlander can take off and land from virtually any flat surface and offers a powerful combination of flexibility, persistence, payload capacity, and efficiency. Airlander is the future of zero-carbon aviation. #RethinkTheSkies
Investor
Apr 2016
Clean. Instantly deployment. Easy to Use. Renovagen builds mobile, renewable hybrid power solutions that are reliable, rugged, silent and painlessly deployable, even in the most remote of locations. Renovagen takes solar power and energy storage where those have never gone before, enabling our peacekeeping, humanitarian and remote commercial customers to access clean, reliable power in remote sites with a reduced logistics burden and environment impact. Renovagen has a range revolutionizing cleantech accessories to be operated in remote locations including metal electrowinning and water prurification. Renovagen further provides protective coatings to keep existing or newly deployed PV systems operating at high yields in all environmental conditions throughout the system life cycle.
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