Founders Fund
Founders Fund is a San Francisco-based venture capital firm that backs science and technology companies across multiple stages, from seed to late-stage. It pursues transformative technologies and follows a founder-friendly investment approach that provides substantial support with minimal interference. The firm invests in ventures solving difficult problems across sectors such as aerospace and transportation, artificial intelligence, advanced computing, energy, healthcare, biotechnology, cybersecurity, fintech, consumer internet, software, robotics, and related technology fields. It has backed notable companies early, including SpaceX, Palantir, and Facebook, reflecting a history of partnering with ambitious founders to scale breakthrough technologies.
Past deals in Nuclear Energy
General Matter
Venture Round in 2025
General Matter is a nuclear energy company specializing in the operation of energy infrastructure for scalable power generation. It offers compact, resilient systems that function independently of geographical or weather conditions, utilizing non-emitting baseload power sources. These systems support critical applications in various sectors, including computing, industrial manufacturing, and operations in remote environments, enabling consistent and secure power access to meet rising energy demands. Additionally, the company is involved in the production of enriched uranium.
Radiant
Series C in 2024
Radiant is a clean energy startup based in Los Angeles, California, that specializes in the development of portable nuclear microreactors. Founded in 2019, the company aims to provide an alternative to fossil fuels for both military and commercial applications. Its flagship product, the Kaleidos microreactor, is designed to fit within a shipping container, allowing for transportation by air, ship, and road. This innovative microreactor serves as a zero-emissions power source, making it particularly suitable for remote locations and critical applications where traditional diesel generators are typically used.
Avalanche Energy
Series A in 2023
Avalanche Energy develops compact fusion reactors for distributed energy applications. Its modular reactor design enables clean energy production with high energy density, facilitating decarbonization efforts.
Radiant
Series B in 2023
Radiant is a clean energy startup based in Los Angeles, California, that specializes in the development of portable nuclear microreactors. Founded in 2019, the company aims to provide an alternative to fossil fuels for both military and commercial applications. Its flagship product, the Kaleidos microreactor, is designed to fit within a shipping container, allowing for transportation by air, ship, and road. This innovative microreactor serves as a zero-emissions power source, making it particularly suitable for remote locations and critical applications where traditional diesel generators are typically used.
Transatomic Power
Seed Round in 2015
Transatomic Power Corporation is a nuclear reactor design company based in Cambridge, Massachusetts, founded in 2010. The company specializes in developing the Waste-Annihilating Molten Salt Reactor (WAMSR), a 520 MW reactor that converts high-level nuclear waste into clean, carbon-free electric power. Transatomic Power's innovative technology utilizes liquid nuclear fuel, which enhances safety features, improves fuel efficiency, and offers the potential for significant cost savings. The company's focus on designing reactors that are safe, proliferation-resistant, and economically viable positions it at the forefront of efforts to address energy challenges through advanced nuclear solutions.
Transatomic Power
Seed Round in 2014
Transatomic Power Corporation is a nuclear reactor design company based in Cambridge, Massachusetts, founded in 2010. The company specializes in developing the Waste-Annihilating Molten Salt Reactor (WAMSR), a 520 MW reactor that converts high-level nuclear waste into clean, carbon-free electric power. Transatomic Power's innovative technology utilizes liquid nuclear fuel, which enhances safety features, improves fuel efficiency, and offers the potential for significant cost savings. The company's focus on designing reactors that are safe, proliferation-resistant, and economically viable positions it at the forefront of efforts to address energy challenges through advanced nuclear solutions.
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