The Altman Network Study · entity profile · 3 June 2026
Helion Energy is the nuclear fusion company that represents Sam Altman’s single largest personal financial holding — approximately $1.7 billion as of December 31, 2025 — and the second instance of the Prong 3 “repeating resignation template” alongside Oklo. [1][2] Altman invested personally in 2015, became chairman, led the company’s $500M Series E with $375M of his own money (describing Helion and Retro Biosciences as “all my liquid net worth”), and then stepped down from the board in March 2026 as OpenAI was negotiating to buy its power — retaining his financial stake while claiming recusal from the deal. [2][3][4]
The recusal is the contested point. Altman testified under oath that he personally asked OpenAI’s board to explore working with Helion and “vouched for it being a good deal” — before later claiming recusal from “the decision to proceed and the final approval of terms.” The question this profile asks is not whether the recusal was procedurally correct. It is whether recusing from the vote while retaining $1.7 billion in the counterparty and having initiated the relationship constitutes meaningful separation. [3][5]
Formal Profile
Entity: Helion Energy, Inc. Type: Private fusion energy company. HQ: Everett, Washington. Founded: 2013 by David Kirtley (CEO/co-founder). Pre-revenue: Yes — no fusion power plant has delivered electricity. Valuation: $15.5 billion (Series G, June 4, 2026). Total raised: $1.5 billion+. [6][7]
What it does. Helion develops a field-reversed configuration (FRC) pulsed fusion reactor using deuterium-helium-3 (D-He3) fuel, targeting direct electricity generation via magnetic compression. Its 7th-generation prototype Polaris (operational late 2024) became the first privately funded fusion machine to operate with deuterium-tritium fuel and exceeded 150 million °C plasma temperature — ten times the temperature at the Sun’s core. Its first commercial fusion plant, Orion, is under construction in Malaga, Chelan County, Washington, targeting delivery of 50MW of electricity to Microsoft by 2028 under the world’s first fusion power purchase agreement. [6][7][8]
Funding History and Altman’s Investment Arc
| Date | Round | Amount | Valuation | Altman’s Role | Key Investors |
|---|---|---|---|---|---|
| 2013 | Government grants | ~$7M | — | None | NASA, DOE, DoD |
| 2014 | Seed | $1.5M | — | YC president (recruited Helion to YC) | Y Combinator, Mithril Capital (Peter Thiel) |
| 2015 | Personal investment | $9.5M | — | Becomes chairman. Age 30. | Altman personal |
| Nov 2021 | Series E | $500M | — | Led the round. $375M personal. | Altman ($375M), Dustin Moskovitz, Reid Hoffman, others |
| Jan 2025 | Series F | $425M | $5.4B | Chairman | — |
| Mar 2026 | — | — | — | Steps down as chairman | — |
| Jun 4, 2026 | Series G | $465M | $15.5B | Former chairman, retains ~1/3 stake | Led by Thrive Capital. New: Lux Capital, Ford Motor Co (Bill Ford), Alta Park, BoxGroup, Peak XV |
Total invested to date in Helion: $1.5 billion+. Valuation tripled from $5.4B to $15.5B in 17 months. [6][7][9]
Altman described his Helion and Retro Biosciences positions as “all my liquid net worth” at the time of the Series E. Yet within months he was making nine-figure investments in other companies: Wave Mobile Money’s $200M Series A (September 2021), Hermeus’s $100M Series B (March 2022). By June 2024, his total portfolio was documented at approximately $2.8 billion across 400+ companies (WSJ). [3][10]
The Conflict Timeline — From Chairman to “Recused” Counterparty
Late 2022: Altman testified under oath that he “asked OpenAI’s board to explore working with Helion” and that he “vouched for it being a good deal.” He was simultaneously Helion’s chairman and OpenAI’s CEO. [3][5]
May 2023: Microsoft (OpenAI’s primary financial backer and 49% partner in OpenAI Global LLC) signed a power purchase agreement with Helion — the world’s first fusion PPA, targeting 50MW by 2028. Altman was simultaneously Helion’s chairman and OpenAI’s CEO when this deal was signed. [8]
2024: Helion signed an agreement to supply future energy to OpenAI directly. Reported terms (via Axios): OpenAI to receive 12.5% of Helion’s production. Altman testified he was “recused from it on both sides” and did not sign the agreement. [3][5]
March 23, 2026: Reuters reported Altman stepped down from Helion’s board while OpenAI and Helion were “exploring a large-scale partnership” with “advanced discussions to purchase power” — potentially 5 GW by 2030 and 50 GW by 2035. Altman said he would keep his financial interest in Helion but recuse himself from any deal negotiations. [4]
May 12, 2026 (Musk v. Altman testimony): Altman testified he had recused himself from OpenAI’s Helion dealings, defining recusal as covering “the decision to proceed and the final approval of terms.” But he acknowledged:
- OpenAI had a 2024 agreement with Helion as an option/opportunity for future power
- He was aware of a second agreement in March 2026, though he said he was “not familiar with the details” [5]
May 8, 2026: House Oversight Committee sent Altman a letter requesting documents on OpenAI conflict-of-interest handling, specifically citing Helion, with concern about “donated/charitable-purpose funds being used to increase the market value of companies where an executive or board member has an interest.” [11]
June 4, 2026: Helion raised $465M Series G at $15.5B valuation — framed around the Microsoft power plant, not a confirmed new OpenAI offtake. [7]
The Prong 3 Template (Mirror of Oklo)
The resignation pattern is identical across both instances, 11 months apart:
| Element | Oklo (April 2025) | Helion (March 2026) |
|---|---|---|
| Resign board/chair | ✅ April 22, 2025 | ✅ March 23, 2026 |
| Retain financial stake | ✅ ~4.8% equity | ✅ ~1/3 stake (~$1.7B) |
| Frame as voluntary conflict-clearance | ✅ “not due to any disagreement” | ✅ recusal from negotiations |
| Time it to OpenAI commercial relationship | ✅ OpenAI exploring power deal | ✅ “advanced discussions” for 5-50 GW |
| Initiated the relationship | ✅ recruited to YC, seeded, chaired | ✅ “asked the board to explore,” “vouched for it” |
The analyst line (from Keya’s research): The recusal did not end the OpenAI-Helion relationship. At minimum, it coincided with or immediately followed a March 2026 second agreement and continuing scrutiny over a possible large-scale OpenAI power relationship. The test is not merely whether Altman signed the agreement; it is whether the recusal meaningfully separated him from deal formation, strategic direction, valuation benefit, and OpenAI’s energy-procurement pathway. [5]
The Energy Investment Cluster
Helion sits inside a broader personal investment cluster covering every non-grid energy category currently being developed for AI data centers: [12]
| Company | Energy Type | Altman’s Role |
|---|---|---|
| Helion Energy | Nuclear fusion | Chairman 2015-2026; $375M personal; ~$1.7B holding |
| Oklo | Nuclear fission | Chairman 2015-2025; AltC SPAC; ~4.8% equity |
| Exowatt | Solar-thermal for data centers | Personal investment |
| Boom Supersonic | Natural gas turbines for data centers | Board member; asked for the product pivot |
His company OpenAI is the primary driver of the demand all four are positioned to serve. Whether this represents deliberate vertical positioning or emergent adjacent investing, the structural outcome is documentable: one person financially exposed to every energy layer feeding the demand his primary company creates. [12]
Nodes of Interest
N-A · Altman initiated the relationship, then claimed recusal from it. He testified he “asked OpenAI’s board to explore working with Helion” and “vouched for it being a good deal” — then later said he was “recused from the decision to proceed and the final approval of terms.” Initiating and vouching for a deal, then recusing from the vote, is not the same as being uninvolved in the deal’s existence. [3][5]
N-B · The “$1.7 billion counterparty” problem. Altman’s Helion stake is his largest single holding. Every deal between OpenAI and Helion increases Helion’s commercial viability, its valuation, and therefore the value of Altman’s personal position. When Microsoft signed the PPA in May 2023, Helion went from “fusion startup with no revenue” to “company with a contract from the world’s most valuable tech company.” Altman was Helion’s chairman AND OpenAI’s CEO when that happened. [1][2]
N-C · The “all my liquid net worth” claim vs. the $2.8B portfolio. Altman described Helion + Retro as “all my liquid net worth” at the time of the 2021 Series E. Within months he was making nine-figure investments elsewhere. By 2024, WSJ documented ~$2.8B across 400+ companies. [3][10]
N-D · Brockman holds Helion too. OpenAI President Greg Brockman also holds Helion stakes — disclosed per OpenAI’s conflict-of-interest policy. The CEO and the president both have financial exposure to the same counterparty. [1]
N-E · Microsoft sits on both sides. Microsoft is OpenAI’s 49% partner in OpenAI Global LLC AND has a power purchase agreement with Helion. Microsoft benefits from both the AI side (OpenAI) and the energy side (Helion) of any deal. [8]
Open Questions
Did the OpenAI-Helion relationship materially advance after the March 2026 recusal statement? As of June 5, 2026, no finalized new OpenAI-Helion power purchase agreement has been publicly confirmed after the March 23 recusal. The June 4 Series G was framed around Microsoft, not OpenAI. But the March 2026 “second agreement” Altman acknowledged in testimony remains undisclosed in detail.
What are the exact terms of the 2024 OpenAI-Helion agreement? Reported as an “option/opportunity” for future power. The full agreement is not public.
Does Altman’s recusal definition (“the decision to proceed and the final approval of terms”) address deal formation, strategic direction, and valuation influence, or only the final vote?
What is Altman’s current Helion stake size and through which vehicles? The ~one-third figure and $1.7B valuation are from the court filing (December 2025). The Series G at $15.5B would significantly increase the notional value.
Sources
- [Archive] “OpenAI chief Altman has over $2 billion stake in companies that dealt with OpenAI, court filing shows,” Reuters, May 13, 2026 — Helion ~$1.7B (largest holding); Altman recused “on both sides”; Brockman also holds Helion; Microsoft PPA.
- [Archive] “Sam Altman Holds Over $2B Stake in Firms Tied to OpenAI,” BanklessTimes / US News, May 14, 2026 — court exhibit itemizing holdings; Helion ~$1.7B; Stripe ~$633M; Retro ~$258M.
- [Archive] The Altman Network Study, prior-session findings — full Helion investment timeline; “asked the board to explore” and “vouched for it being a good deal” testimony; “all my liquid net worth” quote; $2.8B WSJ portfolio.
- [Archive] Reuters, March 23, 2026 — Altman stepped down from Helion board; OpenAI and Helion exploring large-scale partnership; advanced discussions for 5 GW by 2030, 50 GW by 2035; Altman retaining financial interest.
- [Archive] Musk v. Altman trial testimony, May 12, 2026 — recusal defined as “the decision to proceed and the final approval of terms”; 2024 agreement acknowledged; aware of March 2026 second agreement; “not familiar with the details.”
- [Archive] Helion Energy website / press releases — founded 2013 by David Kirtley; Polaris prototype (7th gen); D-T fusion first; 150M°C; Orion plant under construction in Malaga, WA: https://www.helionenergy.com
- [Archive] “Helion Raises $465 Million Series G Funding Round,” BusinessWire, June 4, 2026 — $465M at $15.5B post-money; led by Thrive Capital; total raised $1.5B+; Polaris milestones.
- [Archive] Microsoft-Helion PPA, May 2023 — first fusion PPA; 50MW by 2028; Helion to deliver electricity to Microsoft data center in Central Washington.
- [Archive] “Helion Energy Secures $425 Million,” January 2025 — Series F at $5.4B; early funding: $7M from NASA/DOE/DoD; YC + Mithril seed $1.5M (2014).
- [Archive] WSJ (Berber Jin et al., June 2024) — Altman’s “opaque investment empire”: ~$2.8B across 400+ companies; Altman HoldCo with JPMorgan debt line.
- [Archive] House Oversight Committee letter to Sam Altman, May 8, 2026 — requesting documents on conflict-of-interest handling; specifically citing Helion; concern about charitable funds increasing market value of executive-held companies: https://oversight.house.gov
- [Archive] The Altman Network Study — energy investment cluster: Helion (fusion) + Oklo (fission) + Exowatt (solar-thermal) + Boom Supersonic (gas turbines) = every non-grid energy category for AI data centers.
Change Log
| # | Element | Before | After | Reason |
|---|---|---|---|---|
| — | Initial profile build | — | — | Profile assembled 3 June 2026 from court filings, Reuters reporting, Musk trial testimony, prior-session research, and the Series G announcement (June 4, 2026). |