NLS Pharmaceutics AG has announced a change in its independent registered public accounting firm following the acquisition of Marcum LLP's attestation business by CBIZ CPAs P.C. As of September 17, 2025, Marcum LLP resigned as the company's auditor, and CBIZ was engaged to take over the role for the fiscal year ending December 31, 2025. The transition was approved by the Audit Committee of NLS Pharmaceutics' Board of Directors. Notably, Marcum's report on the company's financial statements for the fiscal year ended December 31, 2024, did not contain any adverse opinions or disclaimers but did highlight substantial doubt about the company's ability to continue as a going concern. Additionally, the company disclosed material weaknesses in its internal control over financial reporting, specifically related to a lack of trained accounting professionals and insufficient segregation of duties.