{"filing":{"accession_number":"0001292814-26-004722","cik":"0001848309","ticker":"SGML","company_name":"Sigma Lithium Corp","form":"6-K","filing_date":"2026-09-28","report_date":"2026-09-28","primary_document":"sgml20260928_6k.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/1848309/000129281426004722/sgml20260928_6k.htm"},"events":[{"id":35319,"run_id":32527,"accession_number":"0001292814-26-004722","anchor_item_number":"EX-99.1","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.72,"summary":"This exhibit is a press release announcing Sigma Lithium's recognition at UN-Climate Week for sustainability and cleantech innovation in lithium oxide industrialization, combined with an operational update addressing recent legal challenges in Brazil. The primary disclosure is operational and strategic (company recognition, production capacity, job creation), but the material substance lies in the company's response to unspecified \"ongoing legal reviews\" affecting its mining concessions and environmental licenses. The company states operations \"continue normally\" and mining rights are \"not affected,\" but the defensive tone and references to Federal Courts reviewing appeals and District Attorneys' filings suggest material legal/regulatory uncertainty that could affect operations. This does not fit neatly into a single category—it is neither a discrete legal event (no specific litigation or covenant breach disclosed) nor purely operational, but rather a mixed operational-legal disclosure addressing regulatory risk.","company_name":"Sigma Lithium Corp","ticker":"SGML","filing_date":"2026-09-28","form":"6-K","submitted_at":null,"items":[{"id":39333,"accession_number":"0001292814-26-004722","item_number":"EX-99.1","item_title":"ex99-1.htm","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.72,"reasoning":"This exhibit is a press release announcing Sigma Lithium's recognition at UN-Climate Week for sustainability and cleantech innovation in lithium oxide industrialization, combined with an operational update addressing recent legal challenges in Brazil. The primary disclosure is operational and strategic (company recognition, production capacity, job creation), but the material substance lies in the company's response to unspecified \"ongoing legal reviews\" affecting its mining concessions and environmental licenses. The company states operations \"continue normally\" and mining rights are \"not affected,\" but the defensive tone and references to Federal Courts reviewing appeals and District Attorneys' filings suggest material legal/regulatory uncertainty that could affect operations. This does not fit neatly into a single category—it is neither a discrete legal event (no specific litigation or covenant breach disclosed) nor purely operational, but rather a mixed operational-legal disclosure addressing regulatory risk.","classifier_version":"claude-haiku-4-5-20251001+prompt-6be895f9","taxonomy_version":"v1.3","classified_at":"2026-09-28T12:08:16.191823+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":39333,"accession_number":"0001292814-26-004722","item_number":"EX-99.1","item_title":"ex99-1.htm","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.72,"reasoning":"This exhibit is a press release announcing Sigma Lithium's recognition at UN-Climate Week for sustainability and cleantech innovation in lithium oxide industrialization, combined with an operational update addressing recent legal challenges in Brazil. The primary disclosure is operational and strategic (company recognition, production capacity, job creation), but the material substance lies in the company's response to unspecified \"ongoing legal reviews\" affecting its mining concessions and environmental licenses. The company states operations \"continue normally\" and mining rights are \"not affected,\" but the defensive tone and references to Federal Courts reviewing appeals and District Attorneys' filings suggest material legal/regulatory uncertainty that could affect operations. This does not fit neatly into a single category—it is neither a discrete legal event (no specific litigation or covenant breach disclosed) nor purely operational, but rather a mixed operational-legal disclosure addressing regulatory risk.","classifier_version":"claude-haiku-4-5-20251001+prompt-6be895f9","taxonomy_version":"v1.3","classified_at":"2026-09-28T12:08:16.191823+00:00","company_name":"Sigma Lithium Corp","ticker":"SGML","filing_date":"2026-09-28"}]}