Birchtech

2 serious warning signs in Birchtech’s filings.

We look for five warning signs: doubt it can keep going, weak checks on its own accounts, a notice that its past accounts can't be relied on, a change of auditor, and one customer bringing in a big share of sales. We don't check lawsuits, investigations or debt yet.

We checked the auditor's report, internal controls, restatement notices, auditor changes and big customers in the 10-K filed 31 Mar 2026, plus the 10-Q filed 13 Aug 2026 and 3 later 8-Ks.

• Weak checks on its own accounts

  Serious

  The company said its checks on its own accounts did not work at the end of its latest quarter. Mistakes could slip into the numbers.

  “Based on that evaluation, our principal executive officer and principal financial officer concluded, as of the end of the period covered by this report, that the Company’s disclosure controls and procedures were not effective as a result of material weaknesses in our internal control over financial reporting.”

  Show the full paragraph

  Under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we have evaluated the effectiveness of our disclosure controls and procedures (as defined in Rule 13a-15(e) and Rule 15d-15(e) of the Exchange Act) as of the end of the period covered by this report. Disclosure controls and procedures are designed to ensure that information required to be disclosed in reports filed or submitted under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms, and that such information is accumulated and communicated to management, including our principal executive officer and principal financial officer, to allow timely decisions regarding required disclosure. Based on that evaluation, our principal executive officer and principal financial officer concluded, as of the end of the period covered by this report, that the Company’s disclosure controls and procedures were not effective as a result of material weaknesses in our internal control over financial reporting. The ineffectiveness of our disclosure controls and procedures was due to the following material weaknesses in our internal control over financial reporting: (i) lack of a sufficient complement of personnel commensurate with the Company’s reporting requirements; and (ii) insufficient written documentation or training of our internal control policies and procedures which provide staff with guidance or framework for accounting and disclosing financial transactions.

  From the 10-Q filed 13 August 2026, Part I, Item 4. Controls and Procedures. Read it in the filing

• Its past accounts can't be relied on

  Serious

  It told the SEC its earlier accounts should no longer be relied on, usually because they contained errors.

  8-K Item 4.02 filed 31 Mar 2025: the company said its earlier financial statements should no longer be relied on.

  From an 8-K filed 31 March 2025: Previously issued accounts should no longer be relied on. Open the filing

• One big customer

  Worth knowing

  One customer brings in a big share of sales: 29% last year. Losing that customer would hurt.

  “For the year ended December 31, 2025, three customers represented 29%, 11%, and 9% of the Company’s revenues, and for the year ended December 31, 2024, three customers represented 32%, 13%, and 10% of the Company’s revenues.”

  From the 10-K filed 31 March 2026, Item 1A. Risk Factors. Read it in the filing