Deep Fission, Inc. entered a binding 25-year Master Energy Purchase Agreement with the Great Plains Development Authority for a planned commercial power project at the Great Plains Industrial Park in Parsons, Kansas. The agreement turns the parties’ December 2025 letter of intent into a definitive contract and commits Deep Fission to pursue the project and supply electricity once licensed and operating, subject to the agreement’s terms and conditions.
The initial phase is up to 150 MW, with commercial operation targeted for September 30, 2028. Later phases could bring capacity to up to 2,000 MW by 2031, pending further demand growth. The Authority is to purchase electricity generated and made available to meet park tenants’ needs, up to contracted capacity; there is no minimum purchase obligation, and purchases depend on actual tenant demand. The Authority may assign purchase obligations to qualifying tenants. The project is subject to regulatory approvals and other conditions to commercial operation. Deep Fission describes its Gravity reactor as a pressurized water reactor using standard low-enriched uranium fuel, designed for placement approximately one mile underground.
Deep Fission, Inc. (FISN) reported a new collaboration with Youngquist Brothers, LLC, a commercial drilling contractor specializing in large-diameter boreholes, to evaluate and test drilling and borehole-construction methods for Deep Fission’s underground nuclear reactor deployment model.
The companies will jointly advance and test methods for constructing deep, large-diameter boreholes to support Deep Fission’s Gravity Nuclear Reactor™, which uses a small modular pressurized water reactor placed roughly a mile underground in a water-filled borehole. On September 3, they completed an equipment demonstration in Fort Myers, Florida, successfully lowering and retrieving a 30-inch full-size prototype reactor canister into a 34-inch borehole to a depth of about 100 feet using Youngquist’s proprietary drilling technology.
Deep Fission states that Youngquist has drilled large-diameter boreholes exceeding 8,000 feet in depth, providing a foundation for adapting commercial drilling practices to the reactor deployment concept. The company is advancing its first reactor project in Parsons, Kansas, has been selected for the U.S. Department of Energy’s Reactor Pilot Program, and is targeting initial commercial deployment as early as 2027.
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.