{"schema_version":"secwatch.filing_event.v1","accession":"0001104659-25-100076","form_type":"8-K","ticker":"HSDT","cik":"0001610853","company_name":"Solana Co","filed_at":"2025-10-16T23:59:59+00:00","discovered_at":"2026-05-14T18:02:39.914932+00:00","generated_at":"2026-05-17T03:33:06.906947+00:00","sec_items":["4.01","9.01"],"event_type":"other_material","sentiment":"negative","materiality_score":0.65,"calibrated_materiality_score":0.65,"confidence":"high","headline":"Solana Company auditor switches from Baker Tilly to CBIZ; prior reports flagged going concern","bullets":["Baker Tilly US, LLP resigned as independent auditor on October 15, 2025; Audit Committee accepted.","No disagreements or reportable events in fiscal years 2023, 2024 or interim period through Oct 15, 2025.","Baker Tilly's prior reports contained explanatory paragraph expressing substantial doubt about going concern.","New auditor CBIZ CPAs P.C. appointed for fiscal year ending December 31, 2025; no prior consultations."],"urls":{"canonical":"https://secwatch.observer/filing/0001104659-25-100076","json":"https://secwatch.observer/filing/0001104659-25-100076.json","markdown":"https://secwatch.observer/filing/0001104659-25-100076.md","text":"https://secwatch.observer/filing/0001104659-25-100076.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1610853/000110465925100076/0001104659-25-100076-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1610853/000110465925100076/hsdt-20251015x8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-17T03:33:06.906947+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":"2627a8b490d3f93aa6bae756ca4906584f0ba156","claim":"Solana Co engaged CBIZ CPAs P.C. as its auditor.","evidence_excerpt":"On October 15, 2025, the Committee approved the appointment of CBIZ CPAs P.C. (“CBIZ CPAs”) as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2025.","evidence_source":"SEC 8-K Item 4.01/4.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1610853/000110465925100076/0001104659-25-100076-index.htm","confidence":0.9},{"claim_id":"ef70a427826d8f18809a7e240ef5c5b9547303a9","claim":"Baker Tilly US, LLP resigned as auditor of Solana Co.","evidence_excerpt":"On October 15, 2025, the Audit Committee (the “Committee”) of the Board of Directors of Solana Corporation (formerly known as Helius Medical Technologies, Inc.) (the “Company”) received the resignation of Baker Tilly US, LLP (“Baker Tilly”) as the Company’s independent registered public accounting firm, effective immediately.","evidence_source":"SEC 8-K Item 4.01/4.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1610853/000110465925100076/0001104659-25-100076-index.htm","confidence":0.9}],"comparable_filings":[{"accession":"0000911147-26-000031","ticker":"CNTY","company_name":"CENTURY CASINOS INC /CO/","filed_at":"2026-05-28T20:11:41+00:00","headline":"Century Casinos dismisses Grant Thornton, appoints EY as new auditor; cites material weaknesses","event_type":"other_material","sec_items":["4.01","9.01"],"materiality_score":0.7,"calibrated_materiality_score":0.7,"match_reasons":["same fact type: auditor_change","same SEC item: 4.01, 9.01","same event type: other_material","similar materiality"],"urls":{"canonical":"https://secwatch.observer/filing/0000911147-26-000031","json":"https://secwatch.observer/filing/0000911147-26-000031.json","markdown":"https://secwatch.observer/filing/0000911147-26-000031.md","edgar_index":"https://www.sec.gov/Archives/edgar/data/911147/000091114726000031/0000911147-26-000031-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/911147/000091114726000031/cnty-20260522x8k.htm"},"side_by_side_evidence":{"fact_type":"auditor_change","source_excerpt":"On October 15, 2025, the Committee approved the appointment of CBIZ CPAs P.C. 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(“CBIZ CPAs”) as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2025.","source_evidence_url":"https://www.sec.gov/Archives/edgar/data/1610853/000110465925100076/0001104659-25-100076-index.htm","comparable_excerpt":"On May 21, 2026, the Audit Committee and Board of Directors approved the engagement of M&K CPAs, PLLC as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2025, subject to completion of customary client acceptance procedures and execution of a final engagement letter.","comparable_evidence_url":"https://www.sec.gov/Archives/edgar/data/1515139/000149315226025033/0001493152-26-025033-index.htm"}},{"accession":"0001628280-26-035328","ticker":"TUSK","company_name":"MAMMOTH ENERGY SERVICES, INC.","filed_at":"2026-05-15T12:29:32+00:00","headline":"Mammoth Energy Services replaces auditor Deloitte with Carr, Riggs & Ingram","event_type":"other_material","sec_items":["4.01","9.01"],"materiality_score":0.55,"calibrated_materiality_score":0.55,"match_reasons":["same fact type: auditor_change","same SEC item: 4.01, 9.01","same event type: other_material","similar materiality"],"urls":{"canonical":"https://secwatch.observer/filing/0001628280-26-035328","json":"https://secwatch.observer/filing/0001628280-26-035328.json","markdown":"https://secwatch.observer/filing/0001628280-26-035328.md","edgar_index":"https://www.sec.gov/Archives/edgar/data/1679268/000162828026035328/0001628280-26-035328-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1679268/000162828026035328/tusk-20260513.htm"},"side_by_side_evidence":{"fact_type":"auditor_change","source_excerpt":"On October 15, 2025, the Committee approved the appointment of CBIZ CPAs P.C. 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(“CRI”) as its new independent registered public accounting firm.","comparable_evidence_url":"https://www.sec.gov/Archives/edgar/data/1679268/000162828026035328/0001628280-26-035328-index.htm"}},{"accession":"0001493152-26-021570","ticker":"QWTR","company_name":"Quest Water Global, Inc.","filed_at":"2026-05-07T23:59:59+00:00","headline":"Quest Water Global's auditor Fruci resigns; no successor yet","event_type":"other_material","sec_items":["4.01","9.01"],"materiality_score":0.75,"calibrated_materiality_score":0.75,"match_reasons":["same fact type: auditor_change","same SEC item: 4.01, 9.01","same event type: other_material","similar materiality"],"urls":{"canonical":"https://secwatch.observer/filing/0001493152-26-021570","json":"https://secwatch.observer/filing/0001493152-26-021570.json","markdown":"https://secwatch.observer/filing/0001493152-26-021570.md","edgar_index":"https://www.sec.gov/Archives/edgar/data/1487091/000149315226021570/0001493152-26-021570-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1487091/000149315226021570/form8-k.htm"},"side_by_side_evidence":{"fact_type":"auditor_change","source_excerpt":"On October 15, 2025, the Committee approved the appointment of CBIZ CPAs P.C. 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