Co-founder
David Kirtley
David Kirtley is a co-founder of Helion. The company’s founding and leadership material provides context for its work in fusion energy.
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Energy / COMPANY INTELLIGENCE
Helion
Develops pulsed fusion systems intended to convert fusion energy directly into electricity, with prototype development and commercial power plant work underway.
01 / THE BUSINESS
How Helion creates value.
Fusion systems aim to deliver commercial electricity. Technical validation, manufacturing repeatability and delivered power economics must be assessed separately from financing announcements.
SectorEnergy
Founder coverage2 profiles
Research checkedSep 18, 2026
02 / PEOPLE BEHIND THE COMPANY
Meet the builders.
Co-founder
Chris Pihl
Chris Pihl is a co-founder of Helion. The company’s founding and leadership material provides context for its work in fusion energy.
Explore founderSelected founders; historical founding roles are distinct from current management positions.
03 / CAPITAL & OWNERSHIP
Follow the financing.
Selected disclosed events, newest first. Announcement values describe that transaction and date; they are not current share prices. Debt, equity and secondary transactions are identified separately.
- Equity
Series G final close update
Disclosed amount$500M totalPost-money basis at initial close$15.5BNamed participants: Thrive Capital · Lux Capital · Lightspeed Venture Partners · Mithril Capital · SoftBank Vision Fund 2 · Capricorn Technology Impact Funds
September update increased the same round from the initial $465M announced June 4. The final-close update does not restate a new valuation; investors shown were named at the initial close.
Read the announcement
Explore the named investors.
Thrive CapitalLux CapitalLightspeed Venture PartnersMithril CapitalSoftBank Vision Fund 2Capricorn Technology Impact Funds
Names refer to the cited transactions. They do not establish current ownership, ownership percentages, or endorsement of this website.
04 / IN THEIR OWN WORDS
Watch. Listen. Form your view.
Helion
Helion — official video channel
Product demonstrations, company presentations and original updates, linked from the company’s own website.
Visit original material ↗Interviews reflect the speaker’s perspective at publication. Company statements are not independent verification.
05 / EDITORIAL ANALYSIS
The opportunity. The open questions.
Our interpretation of the business model and cited sources, not a valuation or a recommendation.
The case to investigate
- A differentiated technical architecture paired with commercial delivery commitments.
- A stronger product position becomes economically meaningful when customers renew, expand and pay enough to cover delivery costs.
Pressure-test the thesis
- Scientific validation.
- Schedule risk.
- Capital intensity.
What to watch next
01
Machine milestones — what changed in the latest original disclosure?
02
Power delivery progress — what changed in the latest original disclosure?
03
Component reliability — what changed in the latest original disclosure?
YOUR RESEARCH WORKSPACE
Keep the questions that matter.
Use this checklist to record what you have investigated. Your notes stay in this browser.
06 / RESEARCH TRAIL
Go straight to the source.
Company FAQ: technology and ownership statushelionenergy.com · May 18, 2026Company background and development historyhelionenergy.comFounding & leadership backgroundhelionenergy.comSeries G final close updatehelionenergy.com · Sep 2026
Research checked Sep 18, 2026. Selected public disclosures, not a complete capitalization table or securities-filing search. Missing information is left unconfirmed. No investment availability or IPO date is implied.