X0508 4 2024-02-26 0 0001795250 Sphere Entertainment Co. SPHR 0000933028 DOLAN JAMES LAWRENCE TWO PENNSYLVANIA PLAZA NEW YORK NY 10121 1 1 0 1 Executive Chairman / CEO Member of 13(d) Group 0001480991 Dolan Kristin A TWO PENNSYLVANIA PLAZA NEW YORK NY 10121 1 0 0 0 0 Class A Common Stock 2024-02-26 4 P 0 55093 41.0754 A 439619 D Class A Common Stock 2024-02-26 4 P 0 4281 41.5907 A 443900 D Class A Common Stock 14119 I By Spouse Class A Common Stock 746 I By Minor Children This transaction was executed in multiple trades at prices ranging from $40.48 to $41.46 per share. The price reported above reflects the weighted average sale price. The reporting persons hereby undertake to provide upon request to the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected. Includes shares held jointly with spouse. This transaction was executed in multiple trades at prices ranging from $41.49 to $41.73 per share. The price reported above reflects the weighted average sale price. The reporting persons hereby undertake to provide upon request to the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected. Securities held directly by Kristin A. Dolan, James L. Dolan's spouse. Mr. Dolan disclaims beneficial ownership of these securities beneficially owned or deemed to be beneficially owned by Ms. Dolan (other than securities in which he has a direct pecuniary interest) and this report shall not be deemed to be an admission that Mr. Dolan is, for the purposes of Section 16 or for any other purpose, the beneficial owner of such securities. The reporting persons disclaim beneficial ownership of all securities of SPHR beneficially owned and deemed to be beneficially owned by their minor children and this report shall not be deemed an admission that reporting persons are, for the purposes of Section 16 or for any other purpose, the beneficial owner of such securities. /s/ James L. Dolan 2024-02-28 /s/ Kristin A. Dolan 2024-02-28