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Sam Altman, co-founder and chief executive officer of OpenAI Inc., speaks during TechCrunch Disrupt 2019 in San Francisco, California, on Thursday, Oct. 3, 2019.
David Paul Morris | Bloomberg | Getty Images

Nuclear fusion is the ephemeral holy grail of climate technology. It would provide nearly limitless amounts of clean energy without the byproduct of long-lasting radioactive waste to be managed.

It’s also the biggest bet Silicon Valley luminary Sam Altman has ever made.

“This is the biggest investment I’ve ever made,” Altman told CNBC of his $375 million investment in Helion Energy, announced Friday. It’s part of a larger $500 million round that the start-up will use to complete the construction of a fusion facility near its headquarters in Everett, Washington.

Altman was the president of the Silicon Valley start-up shop Y Combinator from 2014 through 2019 and is now the CEO of Open AI, an organization that researches artificial intelligence, which he co-founded with Elon Musk and others. (Musk has since stepped away, citing conflicts of interest with Tesla’s AI pursuits.) Altman has also been a big proponent of universal basic income, the idea that the government should give every citizen a basic living wage to compensate for technological disruptions that make some jobs irrelevant.

Years ago, Altman had made a list of the technologies he wanted to get involved in, and artificial intelligence and energy topped that list.

Altman visited four fusion companies, and made his first investment of $9.5 million into Helion 2015.

“I immediately upon meeting the Helion founders thought they were the best and their technical approach was the best by far,” he said.

Helion’s approach to fusion

Nuclear fusion is the opposite reaction of nuclear fission: Where fission splits a larger atom into two smaller atoms, releasing energy, fusion happens when two lighter nuclei slam together to form a heavier atom. It’s the way the sun makes energy, and the basis of hydrogen bombs. Helion is one of a handful of start-ups working to control and commercialize fusion as an energy source, including Commonwealth Fusion Systems and TAE Technologies.

Perhaps the best-known fusion project is Iter in Southern France, where about 35 nations are collaborating to build a donut-shaped fusion machine called a tokamak.

Helion does not use a tokamak, said David Kirtley, Helion’s co-founder and CEO. The fusion machine Helion is building is long and narrow.

Helion’s fusion machine
Courtesy Helion

Helion uses “pulsed magnetic fusion,” Kirtley explained. That means the company uses aluminum magnets to compress its fuel and then expand it to get electricity out directly.

Extremely high temperatures are needed to create the create and maintain the delicate state of matter called plasma, where electrons are separated from nuclei, and where fusion can occur.

In June, Helion announced it exceeded 100 million degrees Celsius in its 6th fusion generator prototype, Trenta.

Kirtley compares Helion’s fusion machine to a diesel engine, while older technologies are more like a campfire. With a campfire, you stoke the fire to generate heat. In a diesel engine, you inject the fuel into a container, then compress and heat the fuel until it begins to burn. “And then you use the expansion of it to directly do useful work,” said Kirtley.

“By taking this new fresh approach and some of the old physics, we can we can move forward and do it fast,” Kirtley said. “The systems end up being a lot smaller, a lot faster to iterate, and then that gets us to commercially useful electricity, which is solving the climate change problem, as soon as possible.”

Helion Energy is using aneutronic fusion, meaning “they don’t have a lot high energy neutrons present in their fusion reaction,” according to Brett Rampal, the Director of Nuclear Innovation at the non-profit Clean Air Task Force.

There are still unknowns with aneutronic fusion, Rampal said.

“An aneutronic approach, like Helion Energy is pursuing, could have potential benefits that other approaches do not, but could also have different downsides and challenges to achieving commercial fusion energy production,” Rampal said.

Overall, though, Rampal believes the wave of investment and innovation in fusion over the last two decades is good news for the industry.

“With so much left to be proven for true commercial fusion approaches, coming at the problem from multiple different angles and trying to determine where the best pros and cons lie with individual technologies is exactly where the fusion industry should be right now,” Rampal told CNBC.

Altman’s three-part utopian vision

For Altman, fusion is part of his overall vision of increasing abundance through technological innovation — a vision that stands apart from many investors and thinkers in the climate space.

“Number one, I think it is our best shot to get out of the climate crisis,” Altman said.

More generally, “decreasing the cost of energy is one of the best ways to improve people’s quality of lives,” Altman said. “The correlation there is just incredibly big.”

Altman’s utopian vision encompasses three parts.

Artificial intelligence, Altman said, will drive the cost of goods and services down with exponential increases in productivity. Universal basic income will be necessary to pay people’s cost of living in the transition period where many jobs are eliminated. And virtually limitless, low-cost, green energy is the third part of Altman’s vision for the world.

Helion Energy co-founders, Chris Pihl (L) and David Kirtley (R).
Photo courtesy Helion Energy

“So for the same reason I’m so interested in AI, I think that fusion, as a path to abundant energy, is sort of the other part of the equation to get to abundance,” Altman told CNBC.

“I think fundamentally today in the world, the two limiting commodities you see everywhere are intelligence, which we’re trying to work on with AI, and energy, which I think Helion has the most exciting thing in the entire world happening for right now.”

But Altman knows that fusion has been elusive for decades. “The joke in fusion is that it’s been 30 years away for 50 years,” he said.

Kirtley was similarly dismayed by the seemingly impossibly time frames to commercialize fusion. “I got into fusion, spent a couple of years learning everything I could about fusion and all the typical approaches, and actually pivoted away from fusion. I said that these timelines don’t help us,” Kirtley told CNBC.

He worked with NASA, the Air Force and the Defense Advanced Research Projects Agency (DARPA) working on space propulsion technology to help humans travel to Mars and beyond.

But the idea of using approaching fusion with new technologies drew Kirtley back.

Kirtley joined his co-founders John Slough, George Votroubek and Chris Pihl to launch Helion in 2013. “We were able to show that there are actually new approaches to fusion that take modern technology — electronics, and fiber optics and computers — that haven’t been applied to the fusion industry as a whole,” Kirtley said.

The Helion Energy team.
Photo courtesy Helion

The money from the round announced on Friday will be used to complete the construction of Polaris, Helion’s 7th generation fusion facility, which it broke ground on in July and which it aims to use to demonstrate net electricity production in 2024.

Other investors in Helion include LinkedIn founder Reid Hoffman, and Dustin Moskovitz, a Facebook co-founder. Moskovitz also participated again in Friday’s funding round.

The mission is personal for Kirtley, as tackling climate change is for so many. He moved from Southern California to Washington in 2008.

“I watch now Washington summers where we have fires now, and we didn’t when I first moved here,” he said. The urgency is tangible as they are “watching the glaciers melt on Mount Rainier.”

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USDC stablecoin issuer Circle files for IPO as public markets open to crypto

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USDC stablecoin issuer Circle files for IPO as public markets open to crypto

Jeremy Allaire, Co-Founder and CEO, Circle 

David A. Grogan | CNBC

Circle, the company behind the USDC stablecoin, has filed for an initial public offering with the U.S. Securities and Exchange Commission.

The S1 lays the groundwork for Circle’s long-anticipated entry into the public markets.

While the filing does not yet disclose the number of shares or a price range, sources told Fortune that Circle plans to move forward with a public filing in late April and is targeting a market debut as early as June.

JPMorgan Chase and Citi are reportedly serving as lead underwriters, and the company is seeking a valuation between $4 billion and $5 billion, according to Fortune.

This marks Circle’s second attempt at going public. A prior SPAC merger with Concord Acquisition Corp collapsed in late 2022 amid regulatory challenges. Since then, Circle has made strategic moves to position itself closer to the heart of global finance — including the announcement last year that it would relocate its headquarters from Boston to One World Trade Center in New York City.

Read more about tech and crypto from CNBC Pro

Circle is best known as the issuer of USDC, the world’s second-largest stablecoin by market capitalization.

Pegged one-to-one to the U.S. dollar and backed by cash and short-term Treasury securities, USDC has roughly $60 billion in circulation.

Circle is best known as the issuer of USDC, the world’s second-largest stablecoin by market capitalization.

Pegged one-to-one to the U.S. dollar and backed by cash and short-term Treasury securities, USDC has roughly $60 billion in circulation. It makes up about 26% of the total market cap for stablecoins, behind Tether‘s 67% dominance. Its market cap has grown 36% this year, however, compared with Tether’s 5% growth.

Coinbase CEO Brian Armstrong said on the company’s most recent earnings call that it has a “stretch goal to make USDC the number 1 stablecoin.” 

The company’s push into public markets reflects a broader moment for the crypto industry, which is navigating renewed political favor under a more crypto-friendly U.S. administration. The stablecoin sector is ramping up as the industry grows increasingly confident that the crypto market will get its first piece of U.S. legislation passed and implemented this year, focusing on stablecoins.

Stablecoins’ growth could have investment implications for crypto exchanges like Robinhood and Coinbase as they integrate more of them into crypto trading and cross-border transfers. Coinbase also has an agreement with Circle to share 50% of the revenue of its USDC stablecoin.

The stablecoin market has grown about 11% so far this year and about 47% in the past year, and has become a “systemically important” part of the crypto market, according to Bernstein. Historically, digital assets in this sector have been used for trading and as collateral in decentralized finance (DeFi), and crypto investors watch them closely for evidence of demand, liquidity and activity in the market.

More recently, however, rhetoric around stablecoins’ ability to help preserve U.S. dollar dominance – by exporting dollar utility internationally and ensuring demand for U.S. government debt, which backs nearly all dollar-denominated stablecoins – has grown louder.

A successful IPO would make Circle one of the most prominent crypto-native firms to list on a U.S. exchange — an important signal for both investors and regulators as digital assets become more entwined with the traditional financial system.

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Hims & Hers shares rise as company adds new weight-loss medications to platform

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Hims & Hers shares rise as company adds new weight-loss medications to platform

The Hims app arranged on a smartphone in New York on Feb. 12, 2025.

Gabby Jones | Bloomberg | Getty Images

Hims & Hers Health shares closed up 5% on Tuesday after the company announced patients can access Eli Lilly‘s weight loss medication Zepbound and diabetes drug Mounjaro, as well as the generic injection liraglutide, through its platform.

Zepbound, Mounjaro and liraglutide are part of the class of weight loss medications called GLP-1s, which have exploded in popularity in recent years. Hims & Hers launched a weight loss program in late 2023, but its GLP-1 offerings have evolved as the company has contended with a volatile supply and regulatory environment.

Lilly’s weekly injections Zepbound and Mounjaro will cost patients $1,899 a month, according to the Hims & Hers website. The generic liraglutide will cost $299 a month, but it requires a daily injection and can be less effective than other GLP-1 medications.

“As we look ahead, we plan to continue to expand our weight loss offering to deliver an even more holistic, personalized experience,” Dr. Craig Primack, senior vice president of weight loss at Hims & Hers, wrote in a blog post.

A Lilly spokesperson said in a statement that the company has “no affiliation” with Hims & Hers and noted that Zepbound is available at lower costs for people who are insured for the product or for those who buy directly from the company. 

In May, Hims & Hers started prescribing compounded semaglutide, the active ingredient in Novo Nordisk‘s GLP-1 weight loss medications Ozempic and Wegovy. The offering was immensely popular and helped generate more than $225 million in revenue for the company in 2024.

But compounded drugs can traditionally only be mass produced when the branded medications treatments are in shortage. The U.S. Food and Drug Administration announced in February that the shortage of semaglutide injections products had been resolved.

That meant Hims & Hers had to largely stop offering the compounded medications, though some consumers may still be able to access personalized doses if it’s clinically applicable. 

During the company’s quarterly call with investors in February, Hims & Hers said its weight loss offerings will primarily consist of its oral medications and liraglutide. The company said it expects its weight loss offerings to generate at least $725 million in annual revenue, excluding contributions from compounded semaglutide.

But the company is still lobbying for compounded medications. A pop up on Hims & Hers’ website, which was viewed by CNBC, encourages users to “use your voice” and urge Congress and the FDA to preserve access to compounded treatments.

With Tuesday’s rally, Hims and Hers shares are up about 27% in 2025 after soaring 172% last year.

WATCH: Hims & Hers shares tumble over concerns around weight-loss business

Hims & Hers shares tumble over concerns around weight-loss business

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Meta’s head of AI research announces departure

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Meta's head of AI research announces departure

Meta CEO Mark Zuckerberg holds a smartphone as he makes a keynote speech at the Meta Connect annual event at the company’s headquarters in Menlo Park, California, on Sept. 25, 2024.

Manuel Orbegozo | Reuters

Meta’s head of artificial intelligence research announced Tuesday that she will be leaving the company. 

Joelle Pineau, the company’s vice president of AI research, announced her departure in a LinkedIn post, saying her last day at the social media company will be May 30. 

Her departure comes at a challenging time for Meta. CEO Mark Zuckerberg has made AI a top priority, investing billions of dollars in an effort to become the market leader ahead of rivals like OpenAI and Google.

Zuckerberg has said that it is his goal for Meta to build an AI assistant with more than 1 billion users and artificial general intelligence, which is a term used to describe computers that can think and take actions comparable to humans.

“As the world undergoes significant change, as the race for AI accelerates, and as Meta prepares for its next chapter, it is time to create space for others to pursue the work,” Pineau wrote. “I will be cheering from the sidelines, knowing that you have all the ingredients needed to build the best AI systems in the world, and to responsibly bring them into the lives of billions of people.”

Vice President of AI Research and Head of FAIR at Meta Joelle Pineau attends a technology demonstration at the META research laboratory in Paris on February 7, 2025.

Stephane De Sakutin | AFP | Getty Images

Pineau was one of Meta’s top AI researchers and led the company’s fundamental AI research unit, or FAIR, since 2023. There, she oversaw the company’s cutting-edge computer science-related studies, some of which are eventually incorporated into the company’s core apps. 

She joined the company in 2017 to lead Meta’s Montreal AI research lab. Pineau is also a computer science professor at McGill University, where she is a co-director of its reasoning and learning lab.

Some of the projects Pineau helped oversee include Meta’s open-source Llama family of AI models and other technologies like the PyTorch software for AI developers.

Pineau’s departure announcement comes a few weeks ahead of Meta’s LlamaCon AI conference on April 29. There, the company is expected to detail its latest version of Llama. Meta Chief Product Officer Chris Cox, to whom Pineau reported to, said in March that Llama 4 will help power AI agents, the latest craze in generative AI. The company is also expected to announce a standalone app for its Meta AI chatbot, CNBC reported in February

“We thank Joelle for her leadership of FAIR,” a Meta spokesperson said in a statement. “She’s been an important voice for Open Source and helped push breakthroughs to advance our products and the science behind them.” 

Pineau did not reveal her next role but said she “will be taking some time to observe and to reflect, before jumping into a new adventure.”

WATCH: Meta awaits antitrust fine from EU

Meta awaits antitrust fine from EU

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