DEEP FISSION, INC.

We do not currently own any real property. Other than the lease described below, we do not currently lease any facilities. Our corporate, administrative, and engineering functions operate in a decentralized manner, with employees working through a combination of remote and in-person arrangements. Design, development, regulatory, and site-related activities are conducted in person as required by the nature of those functions and applicable regulatory requirements.

In February 2026, in connection with our participation in the DOE Reactor Pilot Program, we entered into a long-term lease for approximately 100 acres located within the Great Plains Industrial Park in Parsons, Kansas. The Kansas Site is being evaluated to support potential future reactor deployment. The lease includes provisions that, upon the satisfaction of specified conditions, require us to purchase the underlying property.

We believe our current operating arrangements and facilities are adequate to meet our present needs. As our development activities progress, we expect to secure additional facilities, land, or site access arrangements as necessary to support future reactor development, testing, and commercial deployment.