{"schema_version":"secwatch.filing_event.v1","accession":"0001213900-25-086894","form_type":"8-K","ticker":"FISN","cik":"0001918102","company_name":"DEEP FISSION, INC.","filed_at":"2025-09-11T23:59:59+00:00","discovered_at":"2026-05-14T18:02:45.586296+00:00","generated_at":"2026-05-17T06:54:40.659987+00:00","sec_items":["1.01","2.01","3.02","3.03","4.01","5.01","5.02","5.03","5.06","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.85,"calibrated_materiality_score":0.85,"confidence":"high","headline":"Deep Fission completes reverse merger with Surfside, raises $30M for nuclear reactors","bullets":["Merger closed Sept 5, 2025; Deep Fission becomes public via reverse merger with Surfside Acquisition.","Raised $30M ($3/share) in private placement; net ~$26M for R&D, working capital, and pilot reactor.","New leadership: Elizabeth Muller (CEO), Richard Muller (CTO), William 'Mark' Schmitz (CFO).","50.8M shares outstanding post-merger; Legacy Deep Fission holders get 38.5M shares.","Company developing 15 MWe underground pressurized water nuclear reactors in boreholes one mile deep."],"urls":{"canonical":"https://secwatch.observer/filing/0001213900-25-086894","json":"https://secwatch.observer/filing/0001213900-25-086894.json","markdown":"https://secwatch.observer/filing/0001213900-25-086894.md","text":"https://secwatch.observer/filing/0001213900-25-086894.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1918102/000121390025086894/0001213900-25-086894-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1918102/000121390025086894/ea0256443-8k_deep.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-17T06:54:40.659987+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"4595960caa48579541ee70bf4778efc1a968bd11","claim":"DEEP FISSION, INC.: Ceased to be a shell company as a result of the merger.","evidence_excerpt":"As a result of the Merger, we have ceased to be a shell company.","evidence_source":"SEC 8-K Item 5.03/5.05/5.06","evidence_url":"https://www.sec.gov/Archives/edgar/data/1918102/000121390025086894/0001213900-25-086894-index.htm","confidence":0.9,"family_label":"Governance Changes","details":[{"label":"Change","value":"shell status"}],"fact_type":"governance_change"},{"claim_id":"5537701dfb24424bf1cabf630ad421daa1dd6b8e","claim":"DEEP FISSION, INC.: Amended and restated bylaws in their entirety at the effective time of a merger.","evidence_excerpt":"At the Effective Time, we amended and restated our bylaws in their entirety.","evidence_source":"SEC 8-K Item 5.03/5.05/5.06","evidence_url":"https://www.sec.gov/Archives/edgar/data/1918102/000121390025086894/0001213900-25-086894-index.htm","confidence":0.9,"family_label":"Governance Changes","details":[{"label":"Change","value":"bylaw amendment"}],"fact_type":"governance_change"},{"claim_id":"6912e6870a4feabc7a1e4f2efe0a8c06ba14ceb9","claim":"DEEP FISSION, INC.: Amended and restated certificate of incorporation at the effective time of a merger.","evidence_excerpt":"At the Effective Time, we amended and restated our certificate of incorporation.","evidence_source":"SEC 8-K Item 5.03/5.05/5.06","evidence_url":"https://www.sec.gov/Archives/edgar/data/1918102/000121390025086894/0001213900-25-086894-index.htm","confidence":0.9,"family_label":"Governance Changes","details":[{"label":"Change","value":"charter amendment"}],"fact_type":"governance_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}