Company Announcements

Company’s participation follows Nasdaq listing and announcement of customer pipeline representing up to 18.5 GW of potential generation capacity

IDAHO FALLS, Idaho--(BUSINESS WIRE)--Jun. 25, 2026-- Deep Fission, Inc. (Nasdaq: FISN) (“Deep Fission” or the “Company”), an advanced nuclear energy company developing small modular pressurized water reactors installed one mile underground, will participate in the Golden Era of Nuclear Power event at Idaho National Laboratory’s (INL) Materials and Fuels Complex in Idaho Falls, Idaho on Thursday, June 25.

This event comes just ahead of the 250^th anniversary of the United States, underscoring the country’s progress in the nuclear renaissance. Deep Fission was selected as one of 10 companies to participate in the Department of Energy’s (DOE) Reactor Pilot Program. Authorized under Executive Order 14301, the Reactor Pilot Program marks a historic shift in federal policy, enabling reactor testing and deployment on sites outside of national laboratories.

Deep Fission will be represented at the event by Liz Muller, Co-Founder and CEO, alongside members of the Deep Fission team. The event will bring together leaders across the nuclear energy ecosystem to highlight the next generation of nuclear technologies, and the role advanced reactors will play in meeting growing demand for reliable, around-the-clock energy.

Deep Fission’s participation follows its recent public offering on Nasdaq under the ticker “FISN,” as well as the Company’s announcement of a customer pipeline representing up to 18.5 gigawatts (GW) of potential generation capacity through Letters of Intent with data centers, industrial partners, and strategic collaborators.

Deep Fission is developing its Gravity Nuclear Reactor™ approach, which places a small modular pressurized water reactor in a borehole approximately one mile underground. The Company is currently advancing development of its first reactor project in Parsons, Kansas, as part of the DOE’s Reactor Pilot Program.

About Deep Fission

Deep Fission is developing technology that places a small modular pressurized water reactor in a borehole approximately one mile underground. The Company’s Gravity Nuclear Reactor™ approach combines established pressurized water reactor technology with a novel underground deployment model designed to simplify construction, enhance safety, and support scalable commercial deployment. Deep Fission is focused on delivering reliable, low-carbon baseload power to meet growing electricity demand from utilities, industrial customers, and data centers. The Company is currently advancing the development of its first reactor project in Parsons, Kansas and was selected for the U.S. Department of Energy’s Reactor Pilot Program.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the federal securities laws. Forward-looking statements include, but are not limited to, statements regarding Deep Fission’s business strategy, technology development plans, potential commercial deployments, potential demand represented by non-binding LOIs, expected regulatory activities, planned project milestones, potential commercialization, potential revenue recognition, and the timing, feasibility, scalability, safety, and performance of the Company’s technology. These statements are based on current expectations and assumptions and are subject to risks and uncertainties that could cause actual results to differ materially from those expressed or implied.

Important factors that may cause actual results to differ materially include, among others, risks related to the Company’s early stage of development; the non-binding nature of the LOIs; the Company’s ability to negotiate and enter into definitive commercial agreements; technical, engineering, drilling, construction, regulatory, licensing, financing, supply chain, and deployment risks; the Company’s ability to obtain required approvals from the NRC, DOE, and other governmental authorities; market adoption of the Company’s technology; and the other risks described under “Risk Factors” and “Cautionary Note Regarding Forward-Looking Statements” in Deep Fission’s filings with the Securities and Exchange Commission.

Forward-looking statements speak only as of the date of this press release. Deep Fission undertakes no obligation to update any forward-looking statements, except as required by law.

View source version on businesswire.com: https://www.businesswire.com/news/home/20260625837525/en/

Media Contact
Chloe Frader
media@deepfission.com

Investor Relations Contact
Bob Prag
IR@deepfission.com
(858) 794-9500

Elevate IR
(720) 330-2829

Source: Deep Fission, Inc.