Exhibit B.15

JOINT FILING AGREEMENT

Pursuant to Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned agree that the Statement on Schedule 13D to which this exhibit is attached is filed on behalf of each of them.

Date: March 29, 2021

CHARLES F. DOLAN, individually, and as a Trustee of the Charles F. Dolan 2009 Revocable Trust

Charles F. Dolan

HELEN A. DOLAN, individually

Helen A. Dolan

JAMES L. DOLAN, individually

/s/ James L. Dolan

James L. Dolan

THOMAS C. DOLAN, individually

/s/ Thomas C. Dolan

Thomas C. Dolan

MARIANNE E. DOLAN WEBER, individually

Marianne Dolan Weber

DEBORAH A. DOLAN-SWEENEY, individually

Deborah A. Dolan-Sweeney

KATHLEEN M. DOLAN, individually, and as a Trustee of the Charles F. Dolan Children Trust FBO Kathleen M. Dolan, the Charles F. Dolan Children Trust FBO Deborah Dolan-Sweeney, the Charles F. Dolan Children Trust FBO Marianne Dolan Weber, the Charles F. Dolan Children Trust FBO Thomas C. Dolan and the Charles F. Dolan Children Trust FBO James L. Dolan, and as Trustee of the Ryan Dolan 1989 Trust and the Tara Dolan 1989 Trust

Kathleen M. Dolan

CHARLES F. DOLAN 2009 REVOCABLE TRUST

/s/ Brian G. Sweeney

By: Brian G. Sweeney, Trustee

By: Charles F. Dolan, Trustee

CHARLES F. DOLAN CHILDREN TRUST FBO KATHLEEN M. DOLAN

CHARLES F. DOLAN CHILDREN TRUST FBO JAMES L. DOLAN

By: Paul J. Dolan, Trustee

CHARLES F. DOLAN CHILDREN TRUST FBO MARIANNE DOLAN WEBER

CHARLES F. DOLAN CHILDREN TRUST FBO THOMAS C. DOLAN

By: Matthew J. Dolan, Trustee

CHARLES F. DOLAN CHILDREN TRUST FBO DEBORAH DOLAN-SWEENEY

By: Mary S. Dolan, Trustee

CHARLES F. DOLAN 2009 FAMILY TRUST FBO KATHLEEN M. DOLAN

CHARLES F. DOLAN 2009 FAMILY TRUST FBO DEBORAH A. DOLAN-SWEENEY

CHARLES F. DOLAN 2009 FAMILY TRUST FBO MARIANNE E. DOLAN WEBER

CHARLES F. DOLAN 2009 FAMILY TRUST FBO THOMAS C. DOLAN

CHARLES F. DOLAN 2009 FAMILY TRUST FBO JAMES L. DOLAN

By: Mary S. Dolan, Trustee

By: Corby Dolan Leinauer, Trustee

CORBY DOLAN LEINAUER, individually, and as a Trustee of the Charles F. Dolan 2009 Family Trust FBO James L. Dolan, the Charles F. Dolan 2009 Family Trust FBO Thomas C. Dolan, the Charles F. Dolan 2009 Family Trust FBO Kathleen M. Dolan, the Charles F. Dolan 2009 Family Trust FBO Marianne E. Dolan Weber and the Charles F. Dolan 2009 Family Trust FBO Deborah A. Dolan-Sweeney

Corby Dolan Leinauer

MARY S. DOLAN, individually, and as a Trustee of the Charles F. Dolan Children Trust FBO Deborah Dolan-Sweeney, the Charles F. Dolan 2009 Family Trust FBO James L. Dolan, the Charles F. Dolan 2009 Family Trust FBO Thomas C. Dolan, the Charles F. Dolan 2009 Family Trust FBO Kathleen M. Dolan, the Charles F. Dolan 2009 Family Trust FBO Marianne E. Dolan Weber and the Charles F. Dolan 2009 Family Trust FBO Deborah A. Dolan-Sweeney

Mary S. Dolan

PAUL J. DOLAN, individually, and as a Trustee of the Charles F. Dolan Children Trust FBO Kathleen M. Dolan and the Charles F. Dolan Children Trust FBO James L. Dolan

Paul J. Dolan


*By:		/s/ Brian G. Sweeney
		Brian G. Sweeney
		as Attorney-in-Fact

MSG NETWORKS INC. SC 13D/A