Jennifer Koester - 13 Mar 2026 Form 4 Insider Report for Sphere Entertainment Co. (SPHR)

Role: President & COO, Sphere
Signature: /s/ Mark C. Cresitello, Attorney-in-Fact for Jennifer Koester
Issuer symbol: SPHR
Transactions as of: 13 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 17 Mar 2026, 16:05:07 UTC
Previous filing: 13 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Koester Jennifer	President & COO, Sphere	TWO PENNSYLVANIA PLAZA, NEW YORK	/s/ Mark C. Cresitello, Attorney-in-Fact for Jennifer Koester	17 Mar 2026	0002008791

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SPHR	Class A Common Stock	Options Exercise		+17,254	+77%	$0.000000^*	39,726	13 Mar 2026	Direct	F1
transaction	SPHR	Class A Common Stock	Tax liability		-8,808	-22%	$105.70^*	30,918	13 Mar 2026	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	SPHR	Restricted Stock Units	Options Exercise		-17,254	-33%	$0.000000^*	34,509	13 Mar 2026	Class A Common Stock	17,254		Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each restricted stock unit ("RSU") was granted on March 12, 2025 under the Sphere Entertainment Co. ("SPHR") 2020 Employee Stock Plan, as amended and represents a right to receive one share of Class A Common Stock or the cash equivalent thereof. One-third of the RSUs vested and were settled on March 13, 2026. One-third of the RSUs are scheduled to vest and settle on March 15, 2027. The remaining one-third of the RSUs are scheduled to vest and settle on March 15, 2028.
F2	Represents RSUs of SPHR withheld to satisfy tax withholding obligations in connection with the vesting and settlement of RSUs described in footnote 1, exempt under Rule 16b-3.

Content

Each restricted stock unit ("RSU") was granted on March 12, 2025 under the Sphere Entertainment Co. ("SPHR") 2020 Employee Stock Plan, as amended and represents a right to receive one share of Class A Common Stock or the cash equivalent thereof. One-third of the RSUs vested and were settled on March 13, 2026. One-third of the RSUs are scheduled to vest and settle on March 15, 2027. The remaining one-third of the RSUs are scheduled to vest and settle on March 15, 2028.

Represents RSUs of SPHR withheld to satisfy tax withholding obligations in connection with the vesting and settlement of RSUs described in footnote 1, exempt under Rule 16b-3.