December 9, 2025

Montgomery County-Based X-Energy Celebrates $700 million Series D Investment in November 

As global demand for reliable, clean-energy grows, Montgomery County continues to cement its position as a destination for the companies leading innovation in that space. One of the clearest examples is Rockville-based X-energy, a next-generation nuclear reactor and fuel technology company that is shaping the future of clean energy. 

X-energy celebrated another win last month, when it announced the company closed an oversubscribed Series D funding round of approximately $700 million, bringing the company’s total funding to just over $2 billion. X-energy expects to use the funding to help continue the expansion of its supply chain and commercial pipeline.  

“The response and commitment from the participants in this financing round is a strong affirmation of the role X-energy expects to play in shaping the future of energy,” said Kam Ghaffarian, Ph.D., Founder and Executive Chairman of X-energy. “When I founded X-energy, I envisioned a company that could redefine how to make advanced nuclear energy accessible, affordable, and essential to an energy abundant future. With the support of our investors, both new and existing, we are closer to realizing that vision.” 

Investor interest in X-energy has been high recently and last week’s news follows a $500 million dollar investment in 2024 anchored by Amazon, and a $235 million Series C financing round in 2023.  

In July, the company announced a major investment in Montgomery County, by consolidating its two Rockville offices into a new 125,000-square-foot headquarters at Washingtonian Center in Gaithersburg, Maryland. The company plans to retain 260 full-time employees and create more than 525 new jobs over the next six years. These combined investments position X-energy for long-term growth while strengthening Maryland’s emerging leadership in advanced nuclear energy solutions. 

As the world moves toward cleaner, more reliable energy systems, X-energy’s success represents the future of energy innovation that is happening right here in Montgomery County. With strong private-sector investment and a deep commitment to next-generation technology, X-energy exemplifies the type of forward-looking companies fueling Montgomery County’s economic engine.