X0206 3 2023-12-08 0 0001795250 Sphere Entertainment Co. SPHR 0001768583 Byrnes David F. TWO PENNSYLVANIA PLAZA NEW YORK NY 10121 0 1 0 0 EVP, CFO & Treasurer No Securities Owned 0 D Restricted Stock Units 0.00 2024-09-15 Class A Common Stock 2472 D Restricted Stock Units 0.00 2025-09-15 Class A Common Stock 9327 D Each restricted stock unit ("RSU") was granted on April 20, 2022 under the Sphere Entertainment Co. 2020 Employee Stock Plan, as amended (the "2020 Employee Stock Plan"), and represents a right to receive one share of Class A Common Stock or the cash equivalent thereof. The RSUs will vest and settle on September 15, 2024. Each RSU was granted on August 31, 2022 under the 2020 Employee Stock Plan, and represents a right to receive one share of Class A Common Stock or the cash equivalent thereof. The RSUs will vest and settle in two equal installments on September 15, 2024 and September 15, 2025. David F. Byrnes became an officer of Sphere Entertainment Co. on December 8, 2023. Exhibit Index: Exhibit 24 - Power of Attorney /s/ Mark C. Cresitello, Attorney-in-Fact for David F. Byrnes 2023-12-12