Deep Fission, Inc. (Nasdaq: FISN) (“Deep Fission” or the “Company”), an advanced nuclear energy company working to place small modular pressurized water reactors (SMRs) in boreholes approximately one mile underground, today announced that management will participate in the following upcoming investor conferences:

ROTH Emerging Nuclear Technology Conference
Management will participate in the ROTH Emerging Nuclear Technology Conference in New York City on Thursday, October 1, 2026, and will host one-on-one meetings with investors throughout the day.

TD Cowen 11^th Annual Nuclear Roundtable
Management will participate in the virtual TD Cowen 11th Annual Nuclear Roundtable on Thursday, October 8, 2026, and will host one-on-one meetings with investors throughout the day.

Maxim Growth Summit 2026
Management will participate in the Maxim Growth Summit 2026, taking place October 12-14, 2026 in New York City. The Company will host one-on-one meetings with investors on October 13, 2026.

Investors interested in scheduling a meeting with Deep Fission management are encouraged to contact their respective conference representative or the Company’s investor relations team at FISN@elevate-ir.com.

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.

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