Marathon Fusion
Marathon Fusion designs and develops fuel cycle and processing technologies for fusion energy, including advanced pumping systems, isotope separation, and neutron-driven transmutation of materials. Their work focuses on improving the efficiency, economics, and scalability of fusion power plants.
verified 17 July 2026
↗ Fellows Project Marathon Fusion↗ Marathon Fusion: Funding, Team & Investors↗ Marathon FusionFact sheet
- Founded in 2023↗ Fellows Project Marathon Fusion↗ CX-270890: Marathon Fusion, Inc. - Partial Ionization Centrifuge Enabling Differential Pumping and Lithium Isotope Separation for Fusion Energy | Department of Energy↗ Marathon Fusion: Funding, Team & Investors↗ Marathon Fusion - Company Profile↗ Marathon Fusion↗ Marathon Fusion
- HQ in San Francisco, California, USA↗ Fellows Project Marathon Fusion↗ CX-270890: Marathon Fusion, Inc. - Partial Ionization Centrifuge Enabling Differential Pumping and Lithium Isotope Separation for Fusion Energy | Department of Energy↗ Marathon Fusion: Funding, Team & Investors↗ Marathon Fusion - Company Profile↗ Marathon Fusion↗ Marathon Fusion
- Total funding of approximately $12.8 million↗ Fellows Project Marathon Fusion↗ CX-270890: Marathon Fusion, Inc. - Partial Ionization Centrifuge Enabling Differential Pumping and Lithium Isotope Separation for Fusion Energy | Department of Energy↗ Marathon Fusion: Funding, Team & Investors↗ Marathon Fusion - Company Profile↗ Marathon Fusion↗ Marathon Fusion
- Key technology: fuel cycle and processing systems for fusion energy↗ Fellows Project Marathon Fusion↗ CX-270890: Marathon Fusion, Inc. - Partial Ionization Centrifuge Enabling Differential Pumping and Lithium Isotope Separation for Fusion Energy | Department of Energy↗ Marathon Fusion: Funding, Team & Investors↗ Marathon Fusion - Company Profile↗ Marathon Fusion↗ Marathon Fusion
- Key technology: metal foil pumps for tritium management↗ Fellows Project Marathon Fusion↗ CX-270890: Marathon Fusion, Inc. - Partial Ionization Centrifuge Enabling Differential Pumping and Lithium Isotope Separation for Fusion Energy | Department of Energy↗ Marathon Fusion: Funding, Team & Investors↗ Marathon Fusion - Company Profile↗ Marathon Fusion↗ Marathon Fusion
- Key technology: partial ionization plasma centrifuges for isotope separation↗ Fellows Project Marathon Fusion↗ CX-270890: Marathon Fusion, Inc. - Partial Ionization Centrifuge Enabling Differential Pumping and Lithium Isotope Separation for Fusion Energy | Department of Energy↗ Marathon Fusion: Funding, Team & Investors↗ Marathon Fusion - Company Profile↗ Marathon Fusion↗ Marathon Fusion
- Notable partners include US Department of Energy, ARPA-E, and Breakthrough Energy Fellows↗ Fellows Project Marathon Fusion↗ CX-270890: Marathon Fusion, Inc. - Partial Ionization Centrifuge Enabling Differential Pumping and Lithium Isotope Separation for Fusion Energy | Department of Energy↗ Marathon Fusion: Funding, Team & Investors↗ Marathon Fusion - Company Profile↗ Marathon Fusion↗ Marathon Fusion
Connections
- Fusion Industry Association — Industry body whose 2026 Global Fusion Industry report tracks the broader funding and company landscape within which Marathon Fusion operates.↗ Fusion Industry Attracts Record Annual Funding of $4.48bn, Raising Total to $14.24bn - Fusion Industry Association
- Rh3ova — UKAEA–Eni joint venture offering commercial tritium processing and handling services, operating in the same fusion fuel-cycle domain as Marathon Fusion.↗ Fusion Industry Attracts Record Annual Funding of $4.48bn, Raising Total to $14.24bn - Fusion Industry Association
- Tokamak Energy — UK-based fusion company advancing integrated tritium fuel-cycle architecture, a technology area directly adjacent to Marathon Fusion's tritium and fusion fuel-cycle focus.↗ Fusion Industry Attracts Record Annual Funding of $4.48bn, Raising Total to $14.24bn - Fusion Industry Association
Recent developments
Marathon Fusion appears in a startup directory listing on Startup Intros, which also reveals additional investors including Caffeinated Capital, Chaac Ventures, and Gaingels participated in funding rounds.
Read more ↗startupintros.com12 Jul