{"filing":{"accession_number":"0001193125-26-371263","cik":"0001705181","ticker":"ETCG","company_name":"Grayscale Ethereum Classic Trust (ETC)","form":"8-K","filing_date":"2026-08-27","report_date":"2026-08-27","primary_document":"etcg-20260827.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/1705181/000119312526371263/etcg-20260827.htm"},"events":[{"id":30010,"run_id":27507,"accession_number":"0001193125-26-371263","anchor_item_number":"8.01","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.75,"summary":"The Trust is disclosing a material change in its NAV calculation methodology effective September 1, 2026, transitioning from the CoinDesk Ethereum Classic Price Index to the CoinDesk Ethereum Classic Benchmark Extended Rate. This operational change affects how the Trust values its ETC holdings and calculates NAV per share, which directly impacts investor valuations. While the disclosure is primarily operational/procedural in nature, the detailed explanation of the new index methodology, constituent platform selection criteria, and calculation algorithm indicates this is a significant operational event material to shareholders.","company_name":"Grayscale Ethereum Classic Trust (ETC)","ticker":"ETCG","filing_date":"2026-08-27","form":"8-K","submitted_at":null,"items":[{"id":32489,"accession_number":"0001193125-26-371263","item_number":"8.01","item_title":"Other Events.","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.75,"reasoning":"The Trust is disclosing a material change in its NAV calculation methodology effective September 1, 2026, transitioning from the CoinDesk Ethereum Classic Price Index to the CoinDesk Ethereum Classic Benchmark Extended Rate. This operational change affects how the Trust values its ETC holdings and calculates NAV per share, which directly impacts investor valuations. While the disclosure is primarily operational/procedural in nature, the detailed explanation of the new index methodology, constituent platform selection criteria, and calculation algorithm indicates this is a significant operational event material to shareholders.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-08-27T20:09:03.834445+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":32489,"accession_number":"0001193125-26-371263","item_number":"8.01","item_title":"Other Events.","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.75,"reasoning":"The Trust is disclosing a material change in its NAV calculation methodology effective September 1, 2026, transitioning from the CoinDesk Ethereum Classic Price Index to the CoinDesk Ethereum Classic Benchmark Extended Rate. This operational change affects how the Trust values its ETC holdings and calculates NAV per share, which directly impacts investor valuations. While the disclosure is primarily operational/procedural in nature, the detailed explanation of the new index methodology, constituent platform selection criteria, and calculation algorithm indicates this is a significant operational event material to shareholders.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-08-27T20:09:03.834445+00:00","company_name":"Grayscale Ethereum Classic Trust (ETC)","ticker":"ETCG","filing_date":"2026-08-27"}]}