On April 8, 2025, Xenetic Biosciences, Inc. was notified that Marcum LLP resigned as its independent auditor due to Marcum's acquisition by CBIZ CPAs P.C., and on April 9, 2025, CBIZ was engaged as the new auditor. Marcum's audit reports for 2024 and 2023 were unqualified and there were no disagreements or reportable events during that period.