On May 2, 2023, Nicole Steinmetz, Ph.D., advised the board of directors of Mosaic ImmunoEngineering, Inc. of her intention to resign as a member of the board of directors and acting Chief Scientific Officer effective immediately. Dr. Steinmetz confirmed to the Company's board of directors that her resignation is not due to a disagreement with the Company on any matter relating to the Company's operations, policies or practices. Dr. Steinmetz will remain engaged with the Company as a scientific advisor.