On December 8, 2023, the Board of Directors of Sphere Entertainment Co. appointed David F. Byrnes, 53, as Executive Vice President and Treasurer effective as of December 8, 2023. Mr. Byrnes joins the Company from Madison Square Garden Entertainment Corp., where he served as Executive Vice President and Chief Financial Officer since February 2023.

Prior to joining the Company and MSGE, Mr. Byrnes served as Executive Vice President, Corporate Finance at ViacomCBS Inc., a role he assumed in December 2019 following the merger of CBS Corporation (?CBS?) and Viacom Inc. Previously, at CBS, Mr. Byrnes assumed the role of Senior Vice President, Controller and Chief Accounting Officer in 2019; Senior Vice President, Internal Audit in 2015; Senior Vice President, Finance, CBS Technology in 2014; Vice President, Finance at Simon & Schuster, LLC in 2009; and Vice President, Corporate Development in 2008. Before joining CBS, Mr. Byrnes held various financial leadership positions at Automatic Data Processing Inc., including Divisional CFO and Vice President of Financial Reporting and Policy. He began his career in the audit practice at KPMG LLP, where he spent 11 years.

Mr. Byrnes, a certified public accountant, received his undergraduate degree in public accounting from Pace University in 1992 and MBA in finance from the Columbia Business School in 1998.