Helion Energy Stock
| Valuation | $15.5B1, 2 |
| Valuation Date | Jun 4, 2026 |
| Implied Valuation | $17.68B |
| Last Price | $74.16 |
| 52-Week High | $74.16 |
| 52-Week Low | $65.00 |
| YTD Return | +14.09% |
| 1-Year Return | +14.09% |
| 3-Year Return | n/a |
| Total Funding | $1.5B1 |
| Latest Round Amount | $500M3 |
| Latest Round | Series G |
| Funding Rounds | n/a |
| IPO Status | Unknown |
| Expected IPO Date | n/a |
| Revenue | n/a |
| Revenue Type | n/a |
| P/S Ratio | n/a |
About Helion Energy
Helion Energy is a fusion energy company working to build the world's first commercial fusion power plant. Its generators use a pulsed magneto-inertial design that compresses plasma with magnetic fields and recovers electricity directly from the fusion reaction, running on deuterium and helium-3 fuel. The company makes money by selling electricity under long-term power purchase agreements. It signed the world's first fusion power deal with Microsoft in 2023 to supply at least 50 megawatts from 2028 and has a separate agreement with steelmaker Nucor for a 500 megawatt plant. Its first plant is under construction in Malaga, Washington. OpenAI CEO Sam Altman has been the company's most prominent backer since 2015.
Invest in Helion Energy
Helion Energy is a private company, so you can't purchase it with a regular brokerage account. However, its shares are available on Clarity (formerly Hiive).
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News
Goodwin Advises Helion on $500 Million Series G Financing
Helion completed the final close of its upsized $500 million Series G round in September 2026 with sovereign wealth, pension, and crossover investors.
Helion funding round grows to $500M amid uncertainty over fusion startup's Microsoft timeline
Helion added $35 million to its June Series G, bringing the round total to $500 million. CEO David Kirtley said new crossover, pension, and sovereign-wealth investors joined after the initial close.
Helion hedges on how soon it expects to sell electricity from fusion
Helion updated Orion project messaging to say the plant will begin initial operations in 2028, while a company executive said full 50 MW operation is unlikely before 2029 or 2030.
Everett-based Fusion Startup Helion Adds Seattle Office, Hits 800 Employees
Helion opened a downtown Seattle office for its business team as headcount grew to about 800, while continuing construction of the Orion fusion plant in Malaga, Washington.
Helion's Polaris prototype achieves 150 million degree plasma temperature
Helion said its Polaris prototype became the first private fusion machine to use deuterium-tritium fuel and reached plasma temperatures of 150 million degrees Celsius.
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Helion secures world's first fusion power plant regulatory licenses
Helion received Radioactive Materials and Radioactive Air Emissions licenses from Washington state for its Orion fusion plant in Malaga, WA, becoming the first company with regulatory approvals to bui...
Helion secures world-first fusion power plant licenses in Washington
Washington state granted Helion radioactive materials and air emissions licenses for its Orion fusion plant in Malaga, the first regulatory approvals of their kind for a commercial fusion facility.
Helion clears key regulatory milestone on the path to building and operating the world's first fusion power plant
Helion received Washington Department of Health radioactive materials and air-emissions licenses for its Orion fusion plant site in Malaga, Washington, becoming the first company with state regulatory...
Helion clears key regulatory milestone on the path to building and operating the world's first fusion power plant
Helion became the first company in the world to secure the regulatory licenses needed for a fusion power plant, receiving a Radioactive Materials License and a Radioactive Air Emissions License from t...
Nuclear startup Helion hits $15.5 billion valuation in latest funding round
Helion said on June 4, 2026, it raised $465 million in a Series G led by Thrive Capital at a $15.5 billion post-money valuation, bringing total funding to about $1.5 billion.
Helion hits $15.5B valuation with $465M in new cash as it aims to commercialize fusion this decade
GeekWire reported Helion's June 2026 Series G brought total capital above $1.5 billion, with investors including Lux Capital, Peak XV, and Bill Ford joining Thrive Capital.
Helion Raises $465 Million Series G Funding Round
Helion announced a $465 million Series G round led by Thrive Capital at a $15.5 billion post-money valuation to scale fusion manufacturing and deployment.
Microsoft-backed fusion firm Helion raises $465m in Series G funding round
Helion's Series G financing led by Thrive Capital valued the fusion startup at $15.5 billion, nearly tripling its prior valuation from early 2025.
Helion, the Sam Altman-backed fusion startup, raises $465M to build a power plant for Microsoft
Helion raised a $465 million Series G round led by Thrive Capital at a $15.5 billion post-money valuation, bringing its total funding to $1.5 billion as it races to complete its first power plant.
OpenAI CEO Sam Altman's stake in Helion Energy draws scrutiny in Musk trial and on Capitol Hill
Sam Altman faced pointed questions about his financial ties to the Everett, Wash.
Sam Altman Testifies He Owns One Third Of Helion Energy—Worth $1.65 Billion
OpenAI cofounder and CEO Sam Altman testified he has $2 billion worth of personal stakes in companies that conduct business with the ChatGPT maker, including owning a third of power company Helion Ene...
OpenAI CEO Sam Altman exits Helion Energy's board as firms explore partnership
Sam Altman stepped down from Helion's board of directors as OpenAI and Helion began exploring a potential large-scale energy partnership, with Altman recusing himself from deal negotiations.
Sam Altman-backed fusion startup Helion in talks to sell power to OpenAI
Sam Altman stepped down as Helion's board chair amid reported early-stage talks for a deal that could guarantee OpenAI a share of Helion's future power production, reportedly five gigawatts by 2030 an...
Helion Achieves New Industry-First Fusion Energy Milestones, Accelerating Path to Commercial Fusion
Helion's Polaris prototype became the first privately developed fusion machine to demonstrate measurable deuterium-tritium fusion and reached plasma temperatures of 150 million degrees Celsius.
Helion Energy starts construction on nuclear fusion plant to power Microsoft data centers
Helion Energy, a startup backed by OpenAI's Sam Altman and SoftBank's venture capital arm, has started construction on a site for a planned nuclear fusion power plant that will supply power to Microso...
Helion raises $425 mln from SoftBank's venture arm, hits $5.4 bln valuation
Helion raised $425 million in a Series F round including SoftBank Vision Fund 2 and Lightspeed Venture Partners, valuing the fusion company at $5.4 billion to accelerate development of its next-genera...
Helion and Nucor announce collaboration to deploy 500 MWe fusion power plant
Helion and steelmaker Nucor agreed to develop a 500 MWe fusion power plant at a Nucor steel manufacturing facility, with Nucor making a $35 million direct investment in Helion. It was the first fusion...
Helion Energy will provide Microsoft with fusion power starting in 2028
Helion, the clean energy company with its eye firmly on the fusion prize, announced a couple of years ago that it had secured $2.2 billion of funding to help it develop cleaner, safer energy at a comm...
Helion secures $2.2B to commercialize fusion energy
Helion closed a $500 million Series E led by Sam Altman, with an additional $1.7 billion in commitments tied to performance milestones. It was the largest venture round in fusion to date.