Deep Fission (FISN): CEO bought ~$3

~$3

Approx. value · 25K sh @ $0.0001

275K

Holds after · shares reported

Traded

Aug 26, 2025

Filed

Aug 28, 2025

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

1. Aug 26, 2025 · this disclosureInsider · 10 days before an 8-KCEO purchased ~$3 of FISN shares in the open market

What came next

1. Aug 26, 2025InsiderDirector sold ~$3 of FISN shares in the open market
2. Sep 5, 2025Company filing · Form 8-K · Material agreement, Acquisition or saleCompleted buying or selling a business or assets, and changed its auditor (and 7 more items)“Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers; Compensatory Arrangements of Certain Officers.”
3. Nov 7, 2025Company filing · Form 8-K · Executive changeChanged a top executive or board member“On November 7, 2025, Richard A. Muller resigned from the Board of Directors of Deep Fission to focus on his continuing responsibilities as the Company’s Chief Technology Officer.”
4. Nov 17, 2025Company filing · Form 8-K · Material agreementSigned an important agreement
5. Dec 9, 2025Company filing · Form 8-K · Executive changeChanged a top executive or board member“On December 9, 2025, Deep Fission, Inc. entered into an offer letter with Elizabeth Muller, the Company’s President and Chief Executive Officer and Chair of the Board.”
6. Dec 19, 2025Company filing · Form 8-K · Executive change, Other newsChanged a top executive or board member, and reported other company news“On December 19, 2025, the Board of Directors (the “ Board ”) of Deep Fission, Inc. (the “ Company ”) increased the size of the Board to five members and appointed Blake E. Janover and Thomas S. Glanville to the Board, effective immediately.”

How to read SEC Form 4

Form 4 is the filing that officers, directors and owners of more than 10% of a US-listed company must send to the SEC within two business days after they buy, sell or otherwise change their holding of the company's stock.

Full guide: What is an SEC Form 4?

What else is on file for Deep Fission

For Deep Fission, OQRO holds 1 insider filing (SEC Form 4 or Form 144) and 1 fund holdings report (13F) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its FISN page.

How this filing works

• SEC Form 4
• Open-market purchase
• Rule 10b5-1 trading plans

Other disclosures at Deep Fission

• SEC Form 4Nov 13, 2026
• SEC Schedule 13GNov 13, 2026
• SEC Form 4Aug 28, 2025

Everything OQRO holds on this company is on its FISN page.