Current Report · Items 8.01, 9.01 · 8-K

Deep Fission, Inc.

FISNNASDAQEQUITYCurrent

Other Events

Filed Jul 29, 2026Accepted Jul 29, 2026, 4:02 PM EDTCIK 1918102Accession 0001104659-26-088125

Company context

Deep Fission, Inc. (“Deep Fission,” the “Company,” “we,” “our,” or “us”) is a nuclear energy technology company developing a small modular reactor (“SMR”) based on established pressurized water reactor (“PWR”) technology, with novel emplacement in deep boreholes approximately one mile below the Earth’s surface. Our reactor, which we refer to as the Gravity Reactor, will leverage subsurface conditions to support key containment and operating functions, including the use of hydrostatic pressure from a water column within the borehole to support reactor operating pressure and cooling, and the surrounding geological formation to provide structural confinement and shielding. This approach is intended to reduce reliance on large surface containment structures and other safety-related infrastructure associated with conventional nuclear power plants, support faster deployment timelines, improve security, enhance safety, and enable lower capital and operating costs relative to conventional nuclear facilities, while reducing exposure to environmental and other surface-level hazards.

Current securities

FISNNASDAQ · EQUITY · Current

Recent company filings

Disclosure sections

Items 8.01, 9.01

Select an item to read the extracted section. The as-filed document remains the primary evidence.

Item 8.01Item 8.01 - Other Events

Item 8.01 Other Events. On July 23, 2026, the Board of Directors (the “Board”) of Deep Fission, Inc. (the “Company”), upon the recommendation of the Compensation Committee of the Board (the “Compensation Committee”), modified the Company’s Non-Employee Director Compensation Policy as follows, to better align the compensation provided with market practice: Increased the value of the annual equity award to $175,000; Increased the value of the initial award provided to newly appointed directors to $350,000; Increased retainers for the chairs of committees to $25,000 for the Audit Committee of the Board (the “Audit Committee”) and $15,000 for the Compensation Committee and the Nominating and Corporate Governance Committee of the Board (the “NomGov Committee”); and Added retainers for committee members in the amount of $10,000 for the Audit Committee, $7,500 for the Compensation Committee and $5,000 for the NomGov Committee. The Board and the Compensation Committee also approved an additional retainer for an independent chair of the Board or for a lead independent director, as applicable, in the event that an independent chair or lead independent director is appointed. All incremental amounts provided under the modified policy will be provided entirely through additional grants of restricted stock units, subject to a one-year vesting condition, until otherwise determined by the Board or the Compensation Committee.