13G Filing: Berkshire Hathaway and Liberty Media Corp (LSXMA)

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SCHEDULE 13G

EXHIBIT B

JOINT
FILING AGREEMENT PURSUANT TO RULE 13d-1(k)(1)

The undersigned persons hereby agree that reports on Schedule 13G, and amendments thereto, with respect
to the Series C SiriusXM Common Stock of Liberty Media Corporation may be filed in a single statement on behalf of each of such persons, and further, each of such persons designates Warren E. Buffett as its agent and Attorney-in-Fact for the purpose
of executing any and all Schedule 13G filings required to be made by it with the Securities and Exchange Commission.

Dated: April 24, 2017

/S/ Warren E. Buffett

Warren E. Buffett
Berkshire Hathaway Inc.
Dated: April 24, 2017

/S/ Warren E. Buffett

By: Warren E. Buffett
Title: Chairman of the Board
National Indemnity Company
Dated: April 24, 2017

/S/ Marc D. Hamburg

By: Marc D. Hamburg
Title: Chairman of the Board
GEICO Corporation
Dated: April 24, 2017

/S/ William E. Roberts

By: William E. Roberts
Title: President
Government Employees Insurance Company
Dated: April 24, 2017

/S/ William E. Roberts

By: William E. Roberts
Title: President
GEICO Advantage Insurance Company
Dated: April 24, 2017

/S/ William E. Roberts

By: William E. Roberts
Title: President

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