Jennifer Koester - 15 Sep 2026 Form 4 Insider Report for Sphere Entertainment Co. (SPHR)

Reporting relationship: President & COO, Sphere
Issuer ticker: SPHR
Reported as of: 15 Sep 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 17 Sep 2026, 16:05:28 UTC
Prior SEC filing: 17 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Mark C. Cresitello, Attorney-in-Fact for Jennifer Koester

Key filing fact

Jennifer Koester filed Form 4 for Sphere Entertainment Co. (SPHR) on 17 Sep 2026.

Key facts

This page summarizes Jennifer Koester's Form 4 filing for Sphere Entertainment Co. (SPHR).
10 reported transactions and 4 derivative rows are listed below.
Accepted by SEC: 17 Sep 2026, 16:05.

Change

Previous filing in this sequence was filed on 17 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002008791 Primary reporting owner

Koester Jennifer

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

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

SPHR transaction

Class A Common Stock

Options Exercise

Transaction value
Shares: +11,988
Change %: +39%
Price: $0.000000^*
Shares after: 42,906
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F1

SPHR transaction

Class A Common Stock

Options Exercise

Transaction value
Shares: +6,829
Change %: +16%
Price: $0.000000^*
Shares after: 49,735
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F1

SPHR transaction

Class A Common Stock

Options Exercise

Transaction value
Shares: +8,269
Change %: +17%
Price: $0.000000^*
Shares after: 58,004
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F2

SPHR transaction

Class A Common Stock

Tax liability

Transaction value
Shares: -13,826
Change %: -24%
Price: $144.12^*
Shares after: 44,178
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F3

SPHR transaction

Class A Common Stock

Options Exercise

Transaction value
Shares: +20,487
Change %: +46%
Price: $0.000000^*
Shares after: 64,665
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F4

SPHR transaction

Class A Common Stock

Tax liability

Transaction value
Shares: -10,458
Change %: -16%
Price: $144.12^*
Shares after: 54,207
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F5

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

SPHR transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -11,988
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 15 Sep 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 11,988
Exercise price
Footnotes: F1

SPHR transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -6,829
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 15 Sep 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 6,829
Exercise price
Footnotes: F1

SPHR transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -8,269
Change %: -50%
Price: $0.000000^*
Shares after: 8,270
Date: 15 Sep 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 8,269
Exercise price
Footnotes: F2

SPHR transaction Derivative

Performance Restricted Stock Units

Options Exercise

Transaction value
Shares: -20,487
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 15 Sep 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 20,487
Exercise price
Footnotes: F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

Each restricted stock unit ("RSU") was granted on April 22, 2024 under the Sphere Entertainment Co. ("SPHR") 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. One-third of the RSUs vested and were settled on September 13, 2024. One-third of the RSUs vested and were settled on September 15, 2025. The remaining one-third of the RSUs vested and were settled on September 15, 2026.

Footnote F2

Each RSU was granted on August 27, 2024 under the 2020 Employee Stock Plan 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 September 15, 2025. One-third of the RSUs vested and were settled on September 15, 2026. The remaining one-third of the RSUs are scheduled to vest and settle on September 15, 2027.

Footnote F3

Represents RSUs of SPHR withheld to satisfy tax withholding obligations in connection with the vesting and settlement of RSUs described in footnotes 1 and 2, exempt under Rule 16b-3.

Footnote F4

Each performance restricted stock unit ("PSU") was granted on April 22, 2024 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 Compensation Committee of the Board of Directors of SPHR deemed such PSUs earned at 100% of target. The PSUs vested and were settled on September 15, 2026.

Footnote F5

Represents PSUs of SPHR withheld to satisfy tax withholding obligations in connection with the vesting and settlement of PSUs described in footnote 4, exempt under Rule 16b-3.