SCHEDULE 13D/A

SPHERE ENTERTAINMENT CO CL A

Class A Common Stock, par value $.01 per share · CUSIP: 55826T102

Event date: 2026-10-20

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• James L. DolanReported CIK 0000933028

  Shares: 4,756,964.00 · Class: 14.5%

• Thomas C. DolanReported CIK 0000933029

  Shares: 1,234,090.00 · Class: 4.1%

• Kathleen M. Dolan, individually and as Trustee of certain trusts described hereinReported CIK 0000933026

  Shares: 3,692,543.00 · Class: 11.3%

• Marianne Dolan WeberReported CIK 0001098901

  Shares: 1,245,357.00 · Class: 4.1%

• Deborah A. Dolan-SweeneyReported CIK 0000933025

  Shares: 1,224,555.00 · Class: 4.1%

• Patrick F. DolanReported CIK 0000932963

  Shares: 58,022.00 · Class: 0.2%

• Corby Dolan Leinauer, as Trustee of certain trusts described hereinReported CIK 0001788337

  Shares: 3,681,909.00 · Class: 11.3%

• Mary S. Dolan, as Trustee of certain trusts described hereinReported CIK 0000933022

  Shares: 4,280,651.00 · Class: 12.9%

• Paul J. Dolan, as Trustee of certain trusts described hereinReported CIK 0001025983

  Shares: 1,552,631.00 · Class: 5.1%

• Charles F. Dolan Children Trust FBO Kathleen M. DolanReported CIK 0001505843

  Shares: 488,579.00 · Class: 1.7%

• Charles F. Dolan Children Trust FBO Deborah Dolan-SweeneyReported CIK 0001505845

  Shares: 535,276.00 · Class: 1.8%

• Charles F. Dolan Children Trust FBO Marianne Dolan WeberReported CIK 0001505849

  Shares: 474,339.00 · Class: 1.6%

• Charles F. Dolan Children Trust FBO Thomas C. DolanReported CIK 0001505848

  Shares: 488,579.00 · Class: 1.7%

• Charles F. Dolan Children Trust FBO James L. DolanReported CIK 0001505850

  Shares: 960,498.00 · Class: 3.2%

• Charles F. Dolan 2009 Family Trust FBO James L. DolanReported CIK 0001505853

  Shares: 1,053,283.00 · Class: 3.5%

• Charles F. Dolan 2009 Family Trust FBO Thomas C. DolanReported CIK 0001505856

  Shares: 716,156.00 · Class: 2.4%

• Charles F. Dolan 2009 Family Trust FBO Kathleen M. DolanReported CIK 0001505858

  Shares: 621,308.00 · Class: 2.1%

• Charles F. Dolan 2009 Family Trust FBO Marianne E. Dolan WeberReported CIK 0001505857

  Shares: 653,144.00 · Class: 2.2%

• Charles F. Dolan 2009 Family Trust FBO Deborah A. Dolan-SweeneyReported CIK 0001505854

  Shares: 578,498.00 · Class: 2.0%

• Charles F. Dolan 2009 Family Trust FBO Patrick F. DolanReported CIK 0001505855

  Shares: 56,947.00 · Class: 0.2%

• Ryan Dolan 1989 TrustReported CIK 0001505841

  Shares: 7,659.00 · Class: 0.1%

• Tara Dolan 1989 TrustReported CIK 0001505842

  Shares: 7,659.00 · Class: 0.1%

• Marianne E. Dolan Weber 2012 Descendants TrustReported CIK 0001564760

  Shares: 56,948.00 · Class: 0.2%

• Kathleen M. Dolan 2012 Descendants TrustReported CIK 0001564761

  Shares: 56,947.00 · Class: 0.2%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.