UNITED ~~STATES~~STATESSECURITIES AND EXCHANGE COMMISSIONWASHINGTON, DC 20549

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of ~~the~~The Securities Exchange Act of 1934

Date of ~~Report~~report (Date of earliest event reported): ~~September 22~~November 4, 2025

SPHERE ENTERTAINMENT CO.

(Exact Name of Registrant as Specified in Charter)

Nevada	~~001-39245~~	001-39245	~~84-3755666~~	84-3755666
(State or other jurisdiction of incorporation)	(Commission File Number)		(IRS Employer Identification No.)
(State or other jurisdictionof incorporation)		(CommissionFile Number)		(IRS EmployerIdentification No.)

Two Pennsylvania Plaza, New York, NY

10121

Two Pennsylvania Plaza,

New York,

New York

10121

(Address of principal executive offices)

~~(Zip Code)~~

(Zip Code)

Registrant’s telephone number, including area code: (725) 258-0001

Not Applicable

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425).

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12).

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.-14d-2(b)).

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.-13e-4(c)).

Securities registered pursuant to Section 12(b) of the Act:

Title of ~~each~~Each ~~class~~Class TradingSymbol(s) Name of Each ~~Exchange~~Exchangeon on Which Registered Class A Common Stock SPHR New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 52.02 Results ~~Departure~~ of ~~Directors~~Operations orand ~~Certain~~Financial ~~Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers~~Condition.

On ~~September 22~~November 4, 2025, ~~Gregory~~ ~~Brunner, Senior Vice President, Controller and Principal Accounting Officer of~~ Sphere Entertainment Co. (the “Company”), ~~resigned~~announced ~~effective~~its asfinancial ofresults ~~October 17,~~for ~~2025.~~its ~~Mr. Brunner’s~~third ~~resignation~~quarter ~~from~~ended ~~the~~September ~~Company~~30, is2025. ~~not~~A acopy ~~result~~ of ~~any disagreement with~~ the ~~Company’s~~press ~~independent~~release ~~auditors~~containing orthe ~~any~~announcement ~~member~~is ofincluded ~~management~~as onExhibit ~~any~~99.1 ~~matter~~to ofthis ~~accounting~~Current ~~principles~~Report oron ~~practices,~~Form 8-K and ~~financial~~is ~~statement~~incorporated ~~disclosure~~herein orby ~~internal controls~~reference.

~~Effective~~The asinformation offurnished ~~October 17~~pursuant to this Item 2.02, ~~2025~~including Exhibit 99.1, ~~and~~shall ~~until~~not ~~such~~be ~~time~~deemed as“filed” afor ~~replacement~~purposes isof ~~named,~~Section 18 ~~Robert~~of ~~Langer,~~the Securities Exchange Act of 1934 (the ~~Company’s~~“Exchange ~~Executive~~Act”) ~~Vice~~or ~~President,~~otherwise ~~Chief~~subject ~~Financial~~to ~~Officer~~the liabilities under that Section and ~~Treasurer,~~shall ~~will~~not ~~serve~~be asdeemed to be incorporated by reference into any filing of the Company’s ~~interim~~under ~~principal~~the ~~accounting~~Securities ~~officer.~~Act of 1933 or the Exchange Act.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

99.1 Press Release dated November 4, 2025.

104 Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

~~Date~~SPHERE ENTERTAINMENT CO. (Registrant) By: ~~September 26~~/s/ Robert H. Langer Name: Robert H. Langer Title: Executive Vice President, ~~2025~~Chief Financial Officer and Treasurer

~~SPHERE ENTERTAINMENT CO. (Registrant) By~~Dated: ~~/s/~~November ~~Mark C. Cresitello Name: Mark C. Cresitello Title: Senior Vice President~~4, ~~Deputy General Counsel and Secretary~~2025

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