New York, June 20, 2026, 15:03 EDT
- Oklo ended at $61.17, rising 4.0% on June 18. U.S. markets were shut Friday for Juneteenth.
- Centrus has a letter in place for domestic HALEU fuel tied to as many as five Aurora powerhouses. Deliveries start in 2029.
- This week, Oklo’s path depends on getting fuel, recycling, and construction projects out of the MOU and letter stage and into firm contracts.
Oklo Inc shares climbed in the shortened week after the advanced nuclear company signed a fuel supply letter with Centrus Energy. Investors saw the move as progress on the fuel supply challenge for next-generation reactors. The stock finished Thursday at $61.17, up 4.0% for the day and about 6.4% above last Friday’s close. U.S. markets were closed Friday for Juneteenth and will stay shut through the weekend.
Oklo’s story is shifting now—from policy talk to proof in the supply chain. High-assay low-enriched uranium, or HALEU, is uranium with enrichment levels between 5% and less than 20% uranium-235. Many advanced reactor designs use it to pull more energy from smaller cores.
Centrus said it agreed in a June 18 letter of intent to provide enough HALEU from its American Centrifuge Plant in Ohio for up to five Oklo Aurora powerhouses over several years. Oklo said separately that Kiewit Nuclear Solutions has signed an MOU for engineering, procurement and construction planning tied to the first Aurora units in southern Ohio.
Oklo CEO Jacob DeWitte said the Centrus deal links “power generation, fuel, and customer demand.” Centrus chief Amir Vexler said it’s a move toward “reliable HALEU supply.” That’s the main pitch to investors, who are still looking for proof that nuclear projects can lock up fuel supply before betting on large power campus plans.
Oklo and Standard Nuclear signed an MOU earlier this week to look into recycling used nuclear fuel and tapping U.S. surplus plutonium for new advanced reactor fuel. Oklo CEO Jacob DeWitte said the company wants to take used fuel and surplus material and make reactor fuel from it. Standard Nuclear CEO Kurt Terrani said the agreement might supply his company with feedstock for TRISO fuel and radioisotope power systems.
The move wasn’t limited to Oklo. Shares of Centrus jumped 12.4% Thursday. NuScale Power added 13.5%. Nano Nuclear Energy was up 11.6%. The fuel news lifted much of the speculative nuclear group, not only the company in the deal.
Oklo has a clear read-through, but things are far from settled. The company still needs to nail down definitive deals, permits, fuel production steps, construction, and customers ready to put up capital for the long term. Its most recent quarterly filing listed $2.54 billion in cash, cash equivalents and marketable debt securities as of March 31, but showed a $33.1 million net loss and ongoing operating losses.
A deeper risk is in focus this week under all the fuel headlines. Reuters on Monday said U.S. plans to make Cold War-era plutonium into nuclear fuel could bring heavy security costs and possible delays. Ross Matzkin-Bridger, a former Energy Department and National Nuclear Security Administration official, called the stuff “weapons-usable plutonium.” Ex-Energy Secretary Ernest Moniz told Reuters he figured the government would pay “a hell of a lot” to secure it. Reuters
Looking into the week, investors want to see some real progress on the Centrus and Standard Nuclear deals. They’re waiting for a signed fuel contract, more on prepayments, any regulatory filings, or fresh details about the southern Ohio site linked to Meta’s data center. Oklo says its 1.2-gigawatt Ohio project targets Meta’s local data centers, and plans to go for a Nuclear Regulatory Commission commercial license for the Aurora builds at that location.
Oklo’s stock could be waiting for more than the next news alert. The company got a boost this week after locking up fuel access, but the market wants to see if Oklo can put it all together. How it executes will likely drive the next leg for the shares.
