3/5DEEP FISSION, INC. (FISN): Auditor change

Market data

Price before filing: n/a (n/a close, split/dividend-adjusted)
Market cap at flag: n/a · Latest: $190.1M (2026-10-16)

What happened next

Return from the last close before the filing date to the first close on/after the window end. Pending windows have not fully elapsed. Past performance says nothing certain about the future.

Insider trading around this filing

90 days before the flag: 1 insider sold $2 (1 sale); 1 insider bought $2 (1 purchase)
30 days after: none reported.

Open-market purchases and sales (Form 4 codes P and S) by officers, directors and 10% owners, by transaction date, from 2025-06-13 to 2025-10-11. Excludes option exercises, grants, gifts and tax withholding. Amended filings replace the originals; joint filings count once. Foreign private issuers do not file Form 4. Many insider sales are pre-scheduled (10b5-1 plans) and are not by themselves a sign of wrongdoing.

Verified excerpt

"Change in Fiscal Year" and (ii) the private placement is presented below under Item 2.01, "Completion of Acquisition or Disposition of Assets–The Private Placement" and under Item 3.02, "Unregistered Sales of Equity Securities." In addition, in connection with the Merger, the Board appointed new directors and executive officers."

Quoted from the filing. Source

What this means

The company changed its outside auditor (8-K Item 4.01). A dismissal or resignation, especially near an annual report or with reported disagreements, is a warning sign. Changes caused by audit firms merging are usually routine.

Type: routine (post-merger auditor consolidation)
Disagreements reported: no
Former auditor: Grassi & Co., CPAs, P.C.

Why this score: routine: auditor replaced after company merger/SPAC deal; also within 90 days: Going-concern doubt