Lightbridge reported a wider third-quarter loss as it increased spending on research and development and administrative operations, while advancing plans to test and manufacture its experimental nuclear fuel. The company also said it had been selected for a U.S. Department of Energy program that offers a route toward authorization for a pilot fuel factory at Idaho National Laboratory (INL). That authorization is not yet in place.
The company ended September with $236.7 million in cash and cash equivalents, up from $201.9 million at the end of 2025. It raised capital by selling shares through its at-the-market stock program.
Fuel development and manufacturing
- A potential pilot-factory pathway: Lightbridge was selected in August for the DOE Nuclear Energy Launch Pad program at INL, administered through the National Reactor Innovation Center. The selection provides an accelerated pathway toward DOE authorization to design, build and operate a pilot factory at INL to make lead test assemblies for demonstration in U.S. commercial reactors.
- Authorization remains outstanding: Lightbridge is negotiating agreements and project scope with the program and INL. Construction and operation of the factory still require additional agreements, reviews and authorizations.
- Irradiation testing planned for fuel rodlets: In August, Lightbridge entered into a second project task statement under its research agreement with Battelle Energy Alliance, INL’s operating contractor. The work covers the design, preparation, irradiation and subsequent handling of enriched uranium-zirconium fuel rodlets with cladding, in cylindrical and multi-lobe designs. Testing is planned in the Advanced Test Reactor’s loop facility under controlled conditions intended to represent a commercial reactor.
- Earlier fuel samples are being examined: The first batch of Lightbridge fuel material coupon samples was discharged from the Advanced Test Reactor in May, on schedule, and is undergoing post-irradiation examination at INL. These are separate from the clad rodlets covered by the newer testing work.
- Patent progress in Japan: Japan’s patent office issued a notice of allowance in September for Lightbridge’s multi-zone fuel element application. The allowed claims cover the fuel design, an assembly containing it and a method of producing it using additive manufacturing. The company cited Japan’s 32 operating or returning-to-service reactors and its target for nuclear power to supply about 20% of electricity by fiscal 2040 as relevant market context.
Financial position and spending
- Cash and working capital increased: Cash and cash equivalents totaled $236.7 million at September 30, compared with $201.9 million at December 31, 2025. Working capital was approximately $234.2 million, up from $201.7 million. Cash equivalents consisted primarily of U.S. Treasury instruments with maturities of 30 to 90 days.
- Operating cash use rose: Lightbridge used $13.2 million in operating cash during the first nine months of 2026, versus $8.1 million in the same period of 2025. The increase reflected higher research and development and general and administrative spending, partly offset by higher interest income.
- Share sales contributed to cash: Financing activities provided $48.1 million during the first nine months, compared with $121.4 million a year earlier. Lightbridge sold about 4.3 million shares through its at-the-market program for net proceeds of $48.9 million, including 579,685 shares that raised $4.5 million in the third quarter. About $91.4 million remained available under the company’s $150 million program at quarter-end.
- Quarterly expenses rose: Third-quarter general and administrative expense was $5.0 million, up from $3.2 million a year earlier. Research and development expense rose to $5.3 million from $2.0 million. The increases included higher compensation and stock-based awards, more professional and consulting work, higher computing costs and additional INL project costs.
- Net loss widened: Lightbridge reported a third-quarter net loss of $8.3 million, or 23 cents per basic and diluted share. Non-cash stock-based compensation was $2.4 million, compared with $1.6 million in the prior-year quarter. Other income, mainly interest earned on cash invested largely in Treasury bills, was $2.0 million, up from $1.1 million.
What changes for investors
Lightbridge’s development plan now includes a defined DOE/INL pathway for a pilot factory and planned loop irradiation testing of clad fuel rodlets, but both depend on further work and approvals. Financially, the higher cash balance was supported in part by issuing shares: the company has substantial authorization remaining under its stock-sale program, while operating cash use and development spending have increased.