Recent 8-K filings for FISN

• July 29, 2026, 4:02 PM ET other materiality 0.25 neutral item 8.01item 9.01

  Deep Fission amends director compensation policy; increases equity awards and committee retainers

  Annual equity award for non-employee directors increased to $175,000; initial award for new directors set at $350,000.

• July 17, 2026, 4:06 PM ET other material materiality 0.50 neutral item 5.02item 5.07item 9.01

  Deep Fission shareholders approve 5M share increase to 2025 Equity Plan

  Shareholders approved amendment to 2025 Equity Plan increasing authorized shares by 5,000,000.

• June 22, 2026, 4:20 PM ET other material materiality 0.75 positive item 8.01

  Deep Fission completes IPO, raises $40M at $16.00 per share; stock begins trading on Nasdaq

  Offered 2.5M shares at $16.00/share; gross proceeds of $40M.

• April 22, 2026, 7:59 PM ET other material materiality 0.70 neutral item 7.01item 9.01

  Deep Fission confidentially submits draft S-1 for proposed IPO of common stock

  Confidential submission of Form S-1 to SEC for a proposed public offering of common stock.

• April 9, 2026, 7:59 PM ET regulatory materiality 0.85 negative item 4.02 ◈ Auditor Changes

  Deep Fission restates financials due to SAFE and stock-comp valuation errors

  Board determined Q2/Q3 2025 interim and FY 2024 audited statements are unreliable due to valuation model input errors for SAFEs and stock-based compensation.

• March 5, 2026, 6:59 PM ET regulatory materiality 0.50 neutral item 4.01item 9.01 ◈ Auditor Changes ×2

  Deep Fission replaces auditor dbbmckennon with Grant Thornton; material weakness in internal controls disclosed

  Audit committee approved Grant Thornton as new independent auditor; dbbmckennon dismissed effective Feb 27, 2026.

• February 25, 2026, 6:59 PM ET leadership materiality 0.50 neutral item 5.02

  Deep Fission appoints Chief Nuclear Officer; CEO receives $380K bonus

  Mark Pérès appointed Chief Nuclear Officer effective Feb 19, 2026; base salary $300,000, target bonus 30%, 25,000 RSUs with service- and liquidity-based vesting.

• February 10, 2026, 6:59 PM ET other material materiality 0.75 positive item 1.01item 3.02item 7.01item 8.01item 9.01 ◈ Equity Issuances ×2◈ Material Agreements ×2

  Deep Fission raises $80M in private placement, forms strategic relationship with Blue Owl

  Net proceeds ~$76M from sale of 5,333,333 shares at $15/sh; use for working capital, R&D for first nuclear reactor.

• December 22, 2025, 6:59 PM ET leadership materiality 0.30 neutral item 5.02item 8.01item 9.01

  Deep Fission appoints two independent directors, adopts insider trading policy

  Board expanded to five members; Blake E. Janover (Class I) and Thomas S. Glanville (Class II) appointed effective Dec 19, 2025.

• December 11, 2025, 6:59 PM ET leadership materiality 0.55 neutral item 5.02item 9.01

  Deep Fission CEO Elizabeth Muller receives new compensation package with $475K salary, equity grants

  Annual base salary of $475,000; target performance bonus of 50% of salary.

• December 4, 2025, 6:59 PM ET regulatory materiality 0.70 positive item 7.01item 9.01

  Deep Fission selects Kansas site for DOE advanced reactor pilot; groundbreaking Dec 9

  Pilot site selected at Great Plains Industrial Park in Parsons, Kansas; groundbreaking Dec 9, 2025.

• November 21, 2025, 6:59 PM ET regulatory materiality 0.65 positive item 1.01item 9.01 ◈ Material Agreements

  Deep Fission signs DOE reactor authorization agreement for underground test reactor

  DOE and Deep Fission executed Other Transaction Agreement effective Nov 14, 2025, under EO 14301 pilot program.

• November 12, 2025, 6:59 PM ET leadership materiality 0.60 neutral item 5.02item 9.01

  Deep Fission appoints COO, GC, and two new directors; Muller resigns from board

  Richard A. Muller resigned from board to focus on CTO role; no disagreement with company.

• November 7, 2025, 6:59 PM ET other material materiality 0.80 positive item 7.01item 9.01

  Deep Fission selected for DOE reactor pilot; partnership with Endeavour for 2 GW data center power

  Selected as one of 11 companies for DOE Nuclear Reactor Pilot Program; target criticality by July 4, 2026.

• September 11, 2025, 7:59 PM ET other material materiality 0.85 neutral item 1.01item 2.01item 3.02item 3.03item 4.01item 5.01item 5.02item 5.03item 5.06item 9.01 ◈ Governance Changes ×3

  Deep Fission completes reverse merger with Surfside, raises $30M for nuclear reactors

  Merger closed Sept 5, 2025; Deep Fission becomes public via reverse merger with Surfside Acquisition.

• July 28, 2022, 7:59 PM ET other material materiality 0.30 neutral item 4.01

  Surfside Acquisition appoints Grassi & Co. as new independent auditor for FY2022

  Grassi & Co. appointed as independent registered public accounting firm for fiscal year ending Dec 31, 2022.

• July 19, 2022, 7:59 PM ET other material materiality 0.65 negative item 4.01item 9.01

  Surfside Acquisition's auditor REM resigns; audit report includes going concern paragraph

  Raich Ende Malter & Co. resigned as independent auditor effective July 13, 2022.

Materiality & sentiment trend

Max materiality 0.85 · Median 0.65 · Most common event other_material

5 positive 2 negative 10 neutral

source · FISN on sec.gov