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Deep Fission (FISN) publicly released its U.S. Department of Energy–approved Nuclear Safety Design Agreement (NSDA) for the Gravity™ pilot reactor in Parsons, Kansas. DOE approval of the NSDA is described as the initial step in the safety review process under the DOE Reactor Pilot Program established by Executive Order 14301.
The NSDA sets the agreed safety framework, defining design requirements, planned safety analysis, and regulatory engagement for the underground small modular pressurized water reactor, which uses standard low‑enriched uranium fuel. Deep Fission is the first company in the program to publish its complete NSDA, with limited security‑related redactions, and the company intends, subject to further DOE authorization and NRC licensing, to convert the pilot unit to commercial operation rather than decommission it after initial testing.
Deep Fission (FISN) successfully installed and retrieved a full-size prototype reactor canister using standard commercial drilling equipment operated by a commercial crew.
On September 3, 2026, the team lowered a 20-foot, non-nuclear canister to a depth of 100 feet inside a 34-inch-wide borehole, aligned it, and brought it back to the surface, demonstrating the emplacement and retrieval sequence underlying the company’s deployment model. The canister is a full-scale replica of the planned Gravity™ pressurized water reactor housing.
The company highlights that all equipment used is already in commercial service and that its design relies on mature commercial drilling and pressurized water reactor technology. Deep Fission also recently received U.S. Department of Energy approval of its Nuclear Safety Design Agreement for the Gravity™ reactor under the DOE Reactor Pilot Program.
Deep Fission (Nasdaq: FISN) has appointed veteran HR executive ShawnTrell Scales as its first Chief People Officer, leading people strategy as the company moves from first-of-a-kind nuclear reactor demonstration toward commercial deployment. Scales brings over 20 years of HR leadership across energy, manufacturing, and agtech, most recently serving as Chief Human Resources Officer at Farmer's Business Network. Her remit includes talent strategy, organizational design, employee relations, and culture as Deep Fission scales its workforce to support development of its underground Gravity™ Nuclear Reactor. The company recently received U.S. Department of Energy approval for its Nuclear Safety Design Agreement, targeting delivery of its first full-power reactor in 2027.
Deep Fission (Nasdaq: FISN) announced that the U.S. Department of Energy has approved its Nuclear Safety Design Agreement (NSDA) for the Gravity™ underground nuclear reactor, a key regulatory milestone enabling advancement within the DOE Reactor Pilot Program.
The NSDA approval sets the safety framework for continued development and progression toward demonstration. Deep Fission is advancing its commercial pilot at Great Plains Industrial Park in Parsons, Kansas, where it has drilled a 6,000-foot data acquisition well and delivered a prototype reactor canister, aiming for a demonstration unit intended to transition to Nuclear Regulatory Commission-licensed commercial operation after initial testing and DOE authorization.
Deep Fission (Nasdaq: FISN) announced that Co-Founder and CEO Liz Muller will present at Canaccord Genuity’s 46th Annual Growth Conference in Boston, MA on Tuesday, August 11, 2026 at 1:30 p.m. ET. The company develops advanced nuclear energy solutions using small modular pressurized water reactors deployed one mile underground.
According to Deep Fission, investors can register for a live webcast of the presentation, and Muller will also hold one-on-one meetings with institutional investors on August 11–12, 2026, which can be requested through Canaccord Genuity representatives or Deep Fission’s investor relations email.
Deep Fission (Nasdaq:FISN) announced arrival of its non-nuclear prototype reactor canister at its Parsons, Kansas site, a key milestone in its Proof-of-Concept Well and Gravity Nuclear Reactor™ program. The canister has completed fabrication, hydrostatic testing, and delivery, enabling upcoming large-diameter borehole testing under real-world, non-nuclear conditions.
The company is advancing permitting with the Kansas Department of Health and Environment for a non-nuclear borehole, progressing a full-scale nuclear demonstration borehole and primary heat exchanger design, and participating in the U.S. Department of Energy’s Reactor Pilot Program.
Deep Fission (Nasdaq:FISN) will join DOE Secretary Wright at Idaho National Laboratory’s Golden Era of Nuclear Power event on June 25 in Idaho Falls. The advanced nuclear company was selected for the DOE’s Reactor Pilot Program and is developing its underground Gravity Nuclear Reactor.
According to Deep Fission, participation follows its Nasdaq listing and a customer pipeline of up to 18.5 GW of potential capacity via Letters of Intent, including a first reactor project in Parsons, Kansas.
Deep Fission (Nasdaq:FISN), an advanced nuclear company, announced signed non-binding LOIs with data centers, co-developers, industrial parks, and partners representing up to 18.5 GW of potential generation capacity.
The company is advancing its first reactor project in Kansas under the DOE Reactor Pilot Program and targets first commercial operations in 2027–2028, subject to technical progress, financing, and regulatory approvals.
Deep Fission (Nasdaq:FISN), an advanced nuclear energy company developing underground small modular pressurized water reactors, closed a public offering of 2,500,000 shares at $16.00 per share, raising $40 million in gross proceeds.
The company granted underwriters a 30-day option for 375,000 additional shares and plans to use proceeds for working capital, R&D, licensing, and construction of its first pilot nuclear reactor.
Deep Fission (Nasdaq:FISN) priced a public offering of 2,500,000 common shares at $16.00 per share, targeting $40 million in gross proceeds. Underwriters hold a 30-day option for 375,000 extra shares.
Trading on Nasdaq is expected to begin June 18, 2026, with closing on June 22, 2026. Proceeds will fund working capital and development of its first pilot nuclear reactor.