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Deep Fission, Inc., a pre‑revenue nuclear energy technology company developing a small modular “Gravity Reactor” in deep boreholes, reported a substantially larger loss for the quarter ended June 30, 2026.
Operating expenses rose to $31.6 million from $2.1 million a year earlier, driven by higher research and development and general and administrative spending, including increased stock‑based compensation. Net loss for the quarter was $31.0 million, and for the first six months of 2026 it totaled $52.4 million, compared with $6.9 million in the prior‑year period.
Cash and cash equivalents increased to $93.0 million from $23.7 million at December 31, 2025, primarily from an $80.0 million February 2026 private placement and $34.3 million in net IPO proceeds in June 2026. Despite this, management states that current cash and the recent offering proceeds will not fund planned operations for 12 months, and it cites substantial doubt about the company’s ability to continue as a going concern absent additional financing.
Deep Fission, Inc. reported that on July 23, 2026, its Board of Directors, following a recommendation from the Compensation Committee, modified the company’s Non-Employee Director Compensation Policy to better align director pay with market practice. The Board and Compensation Committee also approved an additional retainer for an independent chair of the Board or a lead independent director, if such a role is appointed. All incremental compensation provided under the modified policy will be delivered entirely as additional restricted stock units with a one-year vesting period, unless the Board or Compensation Committee later determines otherwise.
GLANVILLE THOMAS S reported acquisition or exercise transactions in this Form 4 filing.
DEEP FISSION, INC. director GLANVILLE THOMAS S received a grant of 19,156 restricted stock units on July 23, 2026. Each unit represents a contingent right to receive one share of common stock and will vest on July 20, 2027, provided he continues to provide service through that date. Following this award, his directly held RSU balance is 19,156 units.
JANOVER BLAKE reported acquisition or exercise transactions in this Form 4 filing.
DEEP FISSION, INC. reported that director Janover Blake received a grant of 18,962 Restricted Stock Units on July 23, 2026. Each unit represents a right to one share of common stock and will vest on July 20, 2027, contingent on continued service, leaving 18,962 RSUs held directly.
Goldman Tepper Leslie reported acquisition or exercise transactions in this Form 4 filing.
DEEP FISSION, INC. director Goldman Tepper Leslie received a grant of 19,204 restricted stock units on July 23, 2026. Each unit represents a right to receive one share of common stock and vests on July 20, 2027, subject to continued service, resulting in direct holdings of 19,204 units.
Angell Jonathon reported acquisition or exercise transactions in this Form 4 filing.
DEEP FISSION, INC. director Jonathon Angell received an equity compensation grant of 16,973 restricted stock units on July 23, 2026. Each unit represents a contingent right to receive one share of common stock and vests on July 20, 2027, provided he continues to provide service through that date. Following the award, he directly holds 16,973 restricted stock units linked to the issuer's common stock.
Deep Fission, Inc. held its 2026 annual stockholder meeting, where stockholders approved an amendment to the 2025 Equity Incentive Plan to increase the number of shares of common stock authorized for issuance under the plan by 5,000,000 shares.
Stockholders elected Leslie Goldman Tepper (35,294,762 for; 457,363 withheld) and Blake E. Janover (35,346,726 for; 405,399 withheld) as Class I directors to serve until the 2029 annual meeting. They also ratified Grant Thornton LLP as independent registered public accounting firm for the fiscal year ending December 31, 2026 with 30,680,096 votes for and 5,072,029 abstentions, and approved the equity plan amendment with 30,648,430 votes for, 423,732 against, and 4,679,963 abstentions.
Deep Fission, Inc. has completed a public offering of 2,500,000 shares of common stock at $16.00 per share, raising gross proceeds of $40 million before fees and expenses. The company’s shares trade on the Nasdaq Global Market under the symbol FISN.
The company granted underwriters a 30‑day option to buy up to 375,000 additional shares at the same public price, less underwriting discounts and commissions. Deep Fission plans to use net proceeds for general working capital and corporate purposes, including engineering, research and development, licensing and construction of its first pilot nuclear reactor and related technologies.
Deep Fission, Inc. is offering 2,500,000 shares of common stock at a public offering price of $16.00 per share, for gross proceeds of $40,000,000 and estimated proceeds to the company of $37,200,000 before expenses. The underwriters have a 30-day option to purchase up to 375,000 additional shares. Delivery is expected on or about June 22, 2026.
The prospectus describes Deep Fission’s subsurface small modular Gravity Reactor concept, its phased deployment plan (pilot demonstration under the DOE Reactor Pilot Program, NRC licensing plans, and commercial scale targets), and reactor-level conceptual economics and assumptions for 2x2 and 3x3 fuel configurations. The filing discloses a restatement of previously issued financial statements (identified April 9, 2026) related to SAFE valuations and stock-based compensation and reports material weaknesses in internal control over financial reporting as of March 31, 2026. The offering includes non-binding Cornerstone Investor interest aggregating up to $10 million at the public offering price.