Deep Fission, Inc. has made headlines with its latest filing, revealing an important update regarding its shareholder structure. The company reported that Mark N. Tompkins holds 3.4% of its common stock, which translates to 2,026,767 shares. This filing is significant as it highlights the increasing engagement of shareholders in the electric services sector.

Background

Deep Fission, Inc. operates in the electric services industry, classified under the SIC code 4911. The company trades on the Nasdaq under the ticker symbol FISN. Recently, it has filed several forms with the SEC, including a Schedule 13G/A on November 13, 2026, and a 10-Q on November 4, 2026. The company is categorized as a non-accelerated filer, smaller reporting company, and emerging growth company.

What the Filing Says

The Schedule 13G/A filing indicates that Mark N. Tompkins beneficially owns 2,026,767 shares of Deep Fission, representing 3.4% of the total shares outstanding. The filing states, "The percentage is calculated based on 59,779,233 shares of Common Stock of the Issuer issued and outstanding as of September 30, 2026." This update marks the third amendment to the previous filings regarding Tompkins' shareholding.

Impact

This filing may impact various stakeholders, including existing shareholders, potential investors, and competitors in the electric services industry. The increase in shareholding by Tompkins could signal a growing confidence in Deep Fission's business prospects and strategies. As the electric services sector evolves, other companies may need to evaluate their positions and strategies in light of this update.

What's Next

The filing does not say what happens next. However, it is likely that stakeholders will be watching for further developments and any additional disclosures from Deep Fission, Inc.