Oklo acquires ARMEC to boost reactor manufacturing capability

Oklo did not just buy a shop in Oak Ridge. It brought in a precision manufacturing and engineering firm with the kind of hands-on capability advanced nuclear companies usually struggle to build fast enough: machining, prototyping, fabrication, inspection, procurement support and mechanical engineering.

The company closed the ARMEC acquisition on June 4 and announced it on June 8. ARMEC is based in Oak Ridge, Tennessee, and Oklo said the firm adds roughly 40 engineers, fabricators, machinists, welders and technical staff with nuclear-industry experience. Oklo did not disclose the purchase price, but it said ARMEC generated positive free cash flow in its most recent fiscal year, which makes this more than a talent grab. It is an operating asset being folded into a reactor developer’s industrial stack.

The real tell is in the hardware. Oklo said ARMEC had already helped mature nozzle manufacturing from early test-fit hardware into controlled workflows, including drawing development, inspection planning, quality assurance procedures and supplier troubleshooting. That is the unglamorous work that decides whether an advanced reactor program moves cleanly from design packages to repeatable parts and, eventually, to construction and licensing milestones. In this business, a beautiful reactor rendering means little if the welds, tolerances and inspection records do not hold up.

Oak Ridge matters because it gives Oklo a foothold in one of the country’s most recognizable nuclear and engineering clusters, with Oak Ridge National Laboratory and a deep industrial base tied to nuclear work. It also stacks neatly onto Oklo’s Tennessee fuel strategy. In September 2025, the company chose Oak Ridge for what it describes as the nation’s first privately funded commercial nuclear fuel recycling and fuel manufacturing facility, a project it says represents up to a $1.68 billion investment and more than 800 jobs. Adding ARMEC around that center of gravity pulls more engineering and manufacturing control into the same corridor.

That is why this deal reads like a manufacturing story first and a corporate one second. Oklo is still designing and deploying advanced fission power plants, but the ARMEC purchase shows where the bottleneck really is: not in the slide deck, but in the shop floor. The company is betting that if it can own more of the machining, inspection and fabrication loop in Oak Ridge, it can turn advanced nuclear from a plan into a buildable product.