Impact startupClimateSeed
Marathon Fusion
Marathon Fusion is a startup that develops tritium fuel systems for fusion power and produces isotopes for radiopharmaceuticals, based in San Francisco.
CEO and Co-founder
Kyle Schiller
Who it reaches
Patients in targeted cancer therapy, through radioisotope supply, and fusion power developers that need tritium and lithium-6 fuel.
Marathon Fusion funding rounds
| Date | Round | Amount |
|---|---|---|
| Jul 18, 2024 | seed | $5.9 million |
Key facts
- founded
- 2023, per the company's July 18, 2024 releasesource
- seed round
- $5.9 million, announced July 18, 2024, led by 1517 Fund and Anglo Americansource
- total funding
- $6.9M including an ARPA-E CREATE award, per the July 18, 2024 releasesource
- stage
- Seed-stage startup eyeing a Series A, per Heatmap on 27 August 2026source
- self-description
- A leader in isotope production for the radiopharma and fusion industries, per its August 27, 2026 releasesource
WYDE coverage of Marathon Fusion
WYDE Newsroom has published one article about Marathon Fusion, on Oct 24, 2026. Marathon Fusion is the subject of 1 story. The most recent is Marathon Fusion Says Its Neutrons Can Make Medical Isotopes and Gold at 10x CERN Rate.
Reported alongside Marathon Fusion
- CERN · in 1 story with Marathon Fusion
- Adam Rutkowski · in 1 story with Marathon Fusion
- Jason Parisi · in 1 story with Marathon Fusion
- Kyle Schiller · in 1 story with Marathon Fusion
Sources
- PR Newswire: Marathon Fusion Closes $5.9m Seed Round to Process Fuel for Fusion Energy
- TechCrunch: Without this company's technology, future fusion power plants might never light up
- Heatmap: Exclusive: Marathon Fusion Achieves Reactor Fuel Breakthrough
- PR Newswire: Marathon Fusion Demonstrates Lithium and Hydrogen Isotope Enrichment Using Proprietary Plasma Centrifuge Technology
- Marathon Fusion homepage
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