Dolan family group discloses 24.4% Sphere (NYSE: SPHR) ownership in 13D/A update

Rhea-AI Filing Summary

Sphere Entertainment Co. received Amendment No. 8 to a Schedule 13D from members of the Dolan family and related trusts, updating their collective ownership of the company’s Class A Common Stock.

As of March 9, 2026, the group may be deemed to beneficially own 8,698,719 shares of Class A Common Stock, including 1,831,965 existing Class A shares and 6,866,754 shares issuable upon conversion of an equal number of Class B shares. This represents approximately 24.4% of the total Common Stock deemed outstanding, based on 28,635,366 Class A shares outstanding as of January 31, 2026. The filing also adds Thomas C. Dolan as a Reporting Person and confirms there were no transactions in Class A shares by the Reporting Persons since Amendment No. 7.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 8)

Sphere Entertainment Co.

(Name of Issuer)

Class A Common Stock, par value $.01 per share

(Title of Class of Securities)

Samantha H. Crispin
Baker Botts L.L.P., 30 Rockefeller Plaza
New York, NY, 10112
212-408-2500

Sarah J. Dodson
Baker Botts L.L.P., 30 Rockefeller Plaza
New York, NY, 10112
214-953-6585

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

02/25/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

James L. Dolan

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 1,451,276.00
8	Shared Voting Power 2,028,531.00
9	Sole Dispositive Power 1,451,276.00
10	Shared Dispositive Power 2,028,531.00

11

Aggregate amount beneficially owned by each reporting person

3,479,807.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

11.2 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

Excludes 4,622,450 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which James L. Dolan disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Thomas C. Dolan

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 29,355.00
8	Shared Voting Power 1,204,735.00
9	Sole Dispositive Power 29,355.00
10	Shared Dispositive Power 1,204,735.00

11

Aggregate amount beneficially owned by each reporting person

1,234,090.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

4.1 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

Excludes 5,688,893 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which Thomas C. Dolan disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Kathleen M. Dolan, individually and as Trustee of certain trusts described herein

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 18,632.00
8	Shared Voting Power 3,674,847.00
9	Sole Dispositive Power 18,632.00
10	Shared Dispositive Power 3,674,847.00

11

Aggregate amount beneficially owned by each reporting person

3,693,479.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

11.5 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

Excludes 3,369,687 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which Kathleen M. Dolan disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Marianne Dolan Weber

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 11,606.00
8	Shared Voting Power 1,233,751.00
9	Sole Dispositive Power 11,606.00
10	Shared Dispositive Power 1,233,751.00

11

Aggregate amount beneficially owned by each reporting person

1,245,357.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

4.2 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

Excludes 5,713,228 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which Marianne Dolan Weber disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Deborah A. Dolan-Sweeney

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 10,419.00
8	Shared Voting Power 1,214,136.00
9	Sole Dispositive Power 10,419.00
10	Shared Dispositive Power 1,214,136.00

11

Aggregate amount beneficially owned by each reporting person

1,224,555.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

4.1 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

Excludes 5,783,885 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which Deborah A. Dolan-Sweeney disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Patrick F. Dolan

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 1,075.00
8	Shared Voting Power 56,947.00
9	Sole Dispositive Power 1,075.00
10	Shared Dispositive Power 56,947.00

11

Aggregate amount beneficially owned by each reporting person

58,022.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0.2 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

Excludes 6,809,807 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which Patrick F. Dolan disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Corby Dolan Leinauer, as Trustee of certain trusts described herein

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 192.00
8	Shared Voting Power 3,681,867.00
9	Sole Dispositive Power 192.00
10	Shared Dispositive Power 3,681,867.00

11

Aggregate amount beneficially owned by each reporting person

3,682,059.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

11.4 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

Excludes 3,221,008 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which Corby Dolan Leinauer disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Mary S. Dolan, as Trustee of certain trusts described herein

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 3,453.00
8	Shared Voting Power 4,277,198.00
9	Sole Dispositive Power 3,453.00
10	Shared Dispositive Power 4,277,198.00

11

Aggregate amount beneficially owned by each reporting person

4,280,651.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

13.0 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

Excludes 2,652,972 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which Mary S. Dolan disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Paul J. Dolan, as a Trustee of certain trusts described herein

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 46,607.00
8	Shared Voting Power 1,506,024.00
9	Sole Dispositive Power 46,607.00
10	Shared Dispositive Power 1,506,024.00

11

Aggregate amount beneficially owned by each reporting person

1,552,631.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

5.2 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

Excludes 5,429,259 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which Paul J. Dolan disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Charles F. Dolan Children Trust FBO Kathleen M. Dolan

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 488,579.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 488,579.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

488,579.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

1.7 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Excludes 6,402,362 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which the Charles F. Dolan Children Trust FBO Kathleen M. Dolan disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Charles F. Dolan Children Trust FBO Deborah Dolan-Sweeney

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 535,276.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 535,276.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

535,276.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

1.8 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Excludes 6,355,665 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which the Charles F. Dolan Children Trust FBO Deborah Dolan-Sweeney disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Charles F. Dolan Children Trust FBO Marianne Dolan Weber

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 474,339.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 474,339.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

474,339.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

1.6 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Excludes 6,416,602 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which the Charles F. Dolan Children Trust FBO Marianne Dolan Weber disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Charles F. Dolan Children Trust FBO Thomas C. Dolan

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 488,579.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 488,579.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

488,579.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

1.7 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Excludes 6,398,331 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which the Charles F. Dolan Children Trust FBO Thomas C. Dolan disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Charles F. Dolan Children Trust FBO James L. Dolan

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 960,498.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 960,498.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

960,498.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

3.3 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Excludes 5,950,598 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which the Charles F. Dolan Children Trust FBO James L. Dolan disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Charles F. Dolan 2009 Family Trust FBO James L. Dolan

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 1,053,283.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 1,053,283.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

1,053,283.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

3.5 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Excludes 5,820,189 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which the Charles F. Dolan 2009 Family Trust FBO James L. Dolan disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Charles F. Dolan 2009 Family Trust FBO Thomas C. Dolan

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 716,156.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 716,156.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

716,156.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

2.4 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Excludes 6,157,316 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which the Charles F. Dolan 2009 Family Trust FBO Thomas C. Dolan disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Charles F. Dolan 2009 Family Trust FBO Kathleen M. Dolan

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 621,308.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 621,308.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

621,308.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

2.1 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Excludes 6,252,164 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which the Charles F. Dolan 2009 Family Trust FBO Kathleen M. Dolan disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Charles F. Dolan 2009 Family Trust FBO Marianne E. Dolan Weber

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 653,144.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 653,144.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

653,144.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

2.2 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Excludes 6,220,328 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which the Charles F. Dolan 2009 Family Trust FBO Marianne E. Dolan Weber disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Charles F. Dolan 2009 Family Trust FBO Deborah A. Dolan-Sweeney

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 578,498.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 578,498.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

578,498.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

2.0 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Excludes 6,294,974 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which the Charles F. Dolan 2009 Family Trust FBO Deborah A. Dolan-Sweeney disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Charles F. Dolan 2009 Family Trust FBO Patrick F. Dolan

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 56,947.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 56,947.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

56,947.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0.2 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Excludes 6,809,807 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which the Charles F. Dolan 2009 Family Trust FBO Deborah A. Dolan-Sweeney disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Ryan Dolan 1989 Trust

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 7,659.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 7,659.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

7,659.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0.1 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Excludes 6,859,095 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which the Ryan Dolan 1989 Trust disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Tara Dolan 1989 Trust

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 7,659.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 7,659.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

7,659.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0.1 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Excludes 6,859,095 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which the Tara Dolan 1989 Trust disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Marianne E. Dolan Weber 2012 Descendants Trust

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 56,948.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 56,948.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

56,948.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0.2 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Excludes 6,809,806 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which the Marianne E. Dolan Weber 2012 Descendants Trust disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

CUSIP Number(s):

1

Name of reporting person

Kathleen M. Dolan 2012 Descendants Trust

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 56,947.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 56,947.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

56,947.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0.2 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Excludes 6,809,807 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock held by other Reporting Persons hereto as to which the Kathleen M. Dolan 2012 Descendants Trust disclaims beneficial ownership. This report shall not be construed as an admission that such person is the beneficial owner of such securities.

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Class A Common Stock, par value $.01 per share
(b)	Name of Issuer: Sphere Entertainment Co.
(c)	Address of Issuer's Principal Executive Offices: TWO PENNSYLVANIA PLAZA, NEW YORK, NEW YORK , 10121.
Item 1 Comment: This Amendment No. 8 to Schedule 13D ("Amendment No. 8") is being filed jointly by (i) the individuals (in their individual capacity and/or as trustee or co-trustee of specified trusts) and trusts listed in Item 2(a) below (the "Group Members") who may be deemed to beneficially own all of the shares of Class B Common Stock, par value $0.01 per share (the "Class B Common Stock"), of Sphere Entertainment Co. (the "Issuer"), which shares of Class B Common Stock are convertible share for share at the option of the holder into Class A Common Stock of the Issuer, par value $0.01 per share (the "Class A Common Stock," and together with the Class B Common Stock, the "Common Stock"), and a certain number of shares of Class A Common Stock, in each case as described herein, and (ii) certain trustees of such Group Members (the persons referred to in clauses (i) and (ii) collectively, the "Reporting Persons") to report, among other things, the inclusion of Thomas C. Dolan as a Reporting Person. The Schedule 13D filed by the original Reporting Persons on April 24, 2020, as amended and supplemented by Amendment No. 1 filed on March 30, 2021, Amendment No. 2 filed on July 14, 2021, Amendment No. 3 filed on March 1, 2024, Amendment No. 4 filed on December 31, 2024, Amendment No. 5 filed on February 4, 2025, Amendment No. 6 filed on September 10, 2025 and, for the Reporting Persons other than Thomas C. Dolan, Amendment No. 7 filed on February 27, 2026 (as amended, the "Schedule 13D"), is hereby amended and supplemented as set forth below in this Amendment No. 8.
Item 5.	Interest in Securities of the Issuer
(a)	The disclosure in Item 5(a) and (b) is hereby amended and supplemented as follows: (a) and (b) As of March 9, 2026, the Group Members may be deemed to beneficially own an aggregate of 8,698,719 shares of Class A Common Stock as a result of their beneficial ownership of (i) 1,831,965 shares of Class A Common Stock (inclusive of exercisable options, restricted stock units vesting within 60 days of the date hereof and shares held by the Dolan Family Foundation, for which certain Group Members serve as director), and (ii) 6,866,754 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock. This aggregate amount represents approximately 24.4% of the total shares of Common Stock deemed to be currently outstanding. Group Members in the aggregate may be deemed to have the current shared power to vote or direct the vote of and to dispose of or direct the disposition of 6,866,754 shares of Class A Common Stock issuable upon conversion of an equal number of shares of Class B Common Stock (representing all outstanding Class B Common Stock) because of the terms of the Class B Stockholders' Agreement (as previously defined in the Schedule 13D). Reporting Persons and individuals who are not Group Members but are trustees of trusts that are Group Members may be deemed to beneficially own an additional 58,744 shares of Class A Common Stock. Each of the Reporting Persons disclaims beneficial ownership of the securities held by the other Reporting Persons, and this report shall not be deemed to be an admission that any such person is the beneficial owner of such securities. The percentages used herein with respect to the ownership of Class A Common Stock are calculated based on 28,635,366 outstanding shares of Class A Common Stock as of January 31, 2026, as reported by the Issuer in its Annual Report on Form 10-K that was filed with the SEC on February 12, 2026. See the responses to Items 7 through 13 of each cover page to this Amendment No. 8, which are incorporated by reference. See Exhibit A for supplemental information regarding the beneficial ownership of Class A Common Stock by the Group Members and other individuals who are not Group Members but are trustees of trusts that are Group Members. See Exhibit B for additional information regarding the Reporting Persons that are trusts.
(b)	See Item 5(a) above, Exhibit A and Exhibit B.
(c)	There were no transactions in the Class A Common Stock effected by the Reporting Persons named in response to Item 5(a) since Amendment No. 7 to Schedule 13D.
Item 7.	Material to be Filed as Exhibits.
	The disclosure in Item 7 is hereby amended by adding Exhibit A.3 and Exhibit D.3 in appropriate order as follows: Exhibit A.3: Supplemental Beneficial Ownership Information Exhibit D.3: Joint Filing Agreement, dated as of March 9, 2026.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

James L. Dolan

Signature:	/s/ James L. Dolan
Name/Title:	James L. Dolan
Date:	03/09/2026

Thomas C. Dolan

Signature:	/s/ Thomas C. Dolan
Name/Title:	Thomas C. Dolan
Date:	03/09/2026

Kathleen M. Dolan, individually and as Trustee of certain trusts described herein

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact
Date:	03/09/2026

Marianne Dolan Weber

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact
Date:	03/09/2026

Deborah A. Dolan-Sweeney

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact
Date:	03/09/2026

Patrick F. Dolan

Signature:	/s/ Dennis H. Haver
Name/Title:	Dennis H. Javer as Attorney-in-Fact
Date:	03/09/2026

Corby Dolan Leinauer, as Trustee of certain trusts described herein

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact
Date:	03/09/2026

Mary S. Dolan, as Trustee of certain trusts described herein

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact
Date:	03/09/2026

Paul J. Dolan, as a Trustee of certain trusts described herein

Signature:	/s/ Paul J. Dolan
Name/Title:	Paul J. Dolan
Date:	03/09/2026

Charles F. Dolan Children Trust FBO Kathleen M. Dolan

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Kathleen M. Dolan, Trustee
Date:	03/09/2026

Signature:	/s/ Paul J. Dolan
Name/Title:	Paul J. Dolan, Trustee
Date:	03/09/2026

Charles F. Dolan Children Trust FBO Deborah Dolan-Sweeney

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Kathleen M. Dolan, Trustee
Date:	03/09/2026

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Mary S. Dolan, Trustee
Date:	03/09/2026

Charles F. Dolan Children Trust FBO Marianne Dolan Weber

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Kathleen M. Dolan, Trustee
Date:	03/09/2026

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Matthew J. Dolan, Trustee
Date:	03/09/2026

Charles F. Dolan Children Trust FBO Thomas C. Dolan

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Kathleen M. Dolan, Trustee
Date:	03/09/2026

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Matthew J. Dolan, Trustee
Date:	03/09/2026

Charles F. Dolan Children Trust FBO James L. Dolan

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Kathleen M. Dolan, Trustee
Date:	03/09/2026

Signature:	/s/ Paul J. Dolan
Name/Title:	Paul J. Dolan, Trustee
Date:	03/09/2026

Charles F. Dolan 2009 Family Trust FBO James L. Dolan

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Mary S. Dolan, Trustee
Date:	03/09/2026

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Corby Dolan Leinauer, Trustee
Date:	03/09/2026

Charles F. Dolan 2009 Family Trust FBO Thomas C. Dolan

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Mary S. Dolan, Trustee
Date:	03/09/2026

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Corby Dolan Leinauer, Trustee
Date:	03/09/2026

Charles F. Dolan 2009 Family Trust FBO Kathleen M. Dolan

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Mary S. Dolan, Trustee
Date:	03/09/2026

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Corby Dolan Leinauer, Trustee
Date:	03/09/2026

Charles F. Dolan 2009 Family Trust FBO Marianne E. Dolan Weber

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Mary S. Dolan, Trustee
Date:	03/09/2026

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Corby Dolan Leinauer, Trustee
Date:	03/09/2026

Charles F. Dolan 2009 Family Trust FBO Deborah A. Dolan-Sweeney

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Mary S. Dolan, Trustee
Date:	03/09/2026

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Corby Dolan Leinauer, Trustee
Date:	03/09/2026

Charles F. Dolan 2009 Family Trust FBO Patrick F. Dolan

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Mary S. Dolan, Trustee
Date:	03/09/2026

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Corby Dolan Leinauer, Trustee
Date:	03/09/2026

Ryan Dolan 1989 Trust

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Kathleen M. Dolan, Trustee
Date:	03/09/2026

Tara Dolan 1989 Trust

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Kathleen M. Dolan, Trustee
Date:	03/09/2026

Marianne E. Dolan Weber 2012 Descendants Trust

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Richard Baccari, Trustee
Date:	03/09/2026

Kathleen M. Dolan 2012 Descendants Trust

Signature:	/s/ Paul J. Dolan
Name/Title:	Paul J. Dolan, Trustee
Date:	03/09/2026

Signature:	/s/ Brian G. Sweeney
Name/Title:	Brian G. Sweeney as Attorney-in-Fact for Mary S. Dolan, Trustee
Date:	03/09/2026

FAQ

What ownership stake in Sphere Entertainment Co. (SPHR) does the Dolan group report in this Schedule 13D/A?

The Dolan group may be deemed to beneficially own 8,698,719 shares of Sphere Entertainment Class A Common Stock, representing about 24.4% of total Common Stock deemed outstanding, based on 28,635,366 Class A shares reported outstanding as of January 31, 2026.

How is the Dolan group’s 8,698,719 Sphere Entertainment (SPHR) shares composed?

The reported 8,698,719 Class A shares include 1,831,965 existing Class A shares and 6,866,754 Class A shares issuable upon conversion of an equal number of Class B shares, reflecting both current holdings and potential conversion rights held by the group.

Did the Dolan Reporting Persons trade Sphere Entertainment (SPHR) Class A shares before this Amendment No. 8?

The filing states there were no transactions in Sphere Entertainment Class A Common Stock effected by the Reporting Persons named in Item 5(a) since Amendment No. 7, indicating the amendment reflects updated ownership details rather than recent trading activity.

What change does Amendment No. 8 report regarding Dolan family Reporting Persons in Sphere Entertainment (SPHR)?

Amendment No. 8 reports the inclusion of Thomas C. Dolan as a new Reporting Person, alongside other Dolan family members and related trusts that together may be deemed to beneficially own shares of Sphere Entertainment’s Class A and Class B Common Stock.

How much Sphere Entertainment (SPHR) stock is tied to conversion of Class B shares held by the Dolan group?

The group may be deemed to beneficially own 6,866,754 shares of Class A Common Stock issuable upon conversion of an equal number of Class B shares, which also equals all outstanding Class B shares covered by the Class B Stockholders’ Agreement.

What individual Sphere Entertainment (SPHR) ownership does James L. Dolan report in this filing?

James L. Dolan reports beneficial ownership of 3,479,807 Class A shares, or about 11.2% of the class, including 1,451,276 shares with sole voting and dispositive power and 2,028,531 shares with shared voting and dispositive power, while disclaiming ownership of certain additional convertible shares.

On what share count does the Dolan group base its ownership percentage in Sphere Entertainment (SPHR)?

The reported ownership percentages for Class A Common Stock are calculated using 28,635,366 outstanding Class A shares as of January 31, 2026, as disclosed by Sphere Entertainment in its Annual Report on Form 10-K filed with the SEC on February 12, 2026.