Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangement of Certain Officers.

On December 12, 2022, the Board of Directors of Rubicon Technology, Inc. (the "Company") and Timothy Brog, the Company's Chief Executive Officer, President, and Acting Chief Financial Officer, mutually agreed that the Company's operational staffing requirements have changed and that a new Chief Executive Officer is needed. Mr. Brog will remain employed by the Company until the earlier of January 6, 2023, or the hiring of his replacement(s). Mr. Brog's departure was not the result of any disagreements with the Company on any matters relating to its operations, policies or practices. It is expected that Mr. Brog will serve as a consultant to the Company following his departure in order to affect a smooth transition. The terms (including compensation and duration) of such consultancy have not been agreed to as of the date hereof and will be approved by the Board of Directors.

The Company has begun a search for a new Chief Executive Officer.


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