---
schema_version: "secwatch.filing_event.v1"
accession: "0001477932-23-006876"
form_type: "8-K"
ticker: "BCHT"
cik: "0000728385"
company_name: "Birchtech Corp."
filed_at: "2023-09-14T23:59:59+00:00"
generated_at: "2026-06-10T18:10:19.181152+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.35
calibrated_materiality_score: 0.35
confidence: "high"
source: SEC EDGAR
---

# Midwest Energy Emissions dismisses Marcum LLP, engages RRBB P.A. as new auditor

## Summary
- Audit Committee approved dismissal of Marcum effective immediately on September 11, 2023.
- Engaged Rosenberg Rich Baker Berman, P.A. as independent auditor for fiscal year ending Dec 31, 2023.
- No disagreements with Marcum on accounting principles, disclosures, or audit scope.
- Marcum's 2022 audit report was unqualified; prior material weaknesses previously disclosed in Form 10-K.
- Company provided Marcum with disclosure letter; Marcum's response filed as Exhibit 16.1.

## SEC filing metadata
- accession: 0001477932-23-006876
- form_type: 8-K
- ticker: BCHT
- cik: 0000728385
- company_name: Birchtech Corp.
- filed_at: 2023-09-14T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.35
- calibrated_materiality_score: 0.35
- confidence: high
- sec_items: 4.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/728385/000147793223006876/0001477932-23-006876-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/728385/000147793223006876/meec_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001477932-23-006876
- JSON: https://secwatch.observer/filing/0001477932-23-006876.json
- Plain text: https://secwatch.observer/filing/0001477932-23-006876.txt

## Key facts
- Auditor Changes
  Birchtech Corp. dismissed Marcum LLP as its auditor.
  - Action: dismissal
  - Auditor: Marcum LLP
  - Successor: Rosenberg Rich Baker Berman, P.A.
  source text: (the “Company”) approved the dismissal of Marcum LLP (“Marcum”) as the Company’s independent registered public accounting firm effective immediately and the engagement of Rosenberg Rich Baker Berman, P.A. (“RRBB P.A.”) as its new independent registered public accounting firm as of and for the year ended December 31, 2023. As previously reported, Marcum was engaged as the Company’s independent registered accounting firm on August 3, 2022. As described below, the change in independent registered public accounting firm is not the result of any disagreement with Marcum. Marcum reported on the Company’s financial statements for the fiscal year ended December 31, 2022. Marcum’s audit report on the financial statements for the fiscal year ended December 31, 2022 did not provide an adverse opinion or a disclaimer of opinion to the Company’s financial statements, nor modify its opinion as to unc
  evidence_url: https://www.sec.gov/Archives/edgar/data/728385/000147793223006876/0001477932-23-006876-index.htm
- Auditor Changes
  Birchtech Corp. engaged Rosenberg Rich Baker Berman, P.A. as its auditor.
  - Action: engagement
  - Auditor: Rosenberg Rich Baker Berman, P.A.
  source text: (the “Company”) approved the dismissal of Marcum LLP (“Marcum”) as the Company’s independent registered public accounting firm effective immediately and the engagement of Rosenberg Rich Baker Berman, P.A. (“RRBB P.A.”) as its new independent registered public accounting firm as of and for the year ended December 31, 2023. As previously reported, Marcum was engaged as the Company’s independent registered accounting firm on August 3, 2022.
  evidence_url: https://www.sec.gov/Archives/edgar/data/728385/000147793223006876/0001477932-23-006876-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.