Billionaire Warren Buffett Raises Stake in Wells Fargo & Company (WFC) to 10%

Page 85 of 102

Page 85 of 102 – SEC Filing

SCHEDULE 13G

EXHIBIT B

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

AND POWER OF ATTORNEY

The undersigned persons hereby agree that reports on Schedule 13G, and amendments thereto, with respect to the Common Stock of Wells
Fargo & Company 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: February 16, 2016 /S/ Warren E. Buffett
Warren E. Buffett
Berkshire Hathaway Inc.
Dated: February 16, 2016 /S/ Warren E. Buffett
By: Warren E. Buffett
Title: Chairman of the Board
National Indemnity Company
Dated: February 16, 2016 /S/ Marc D. Hamburg
By: Marc D. Hamburg
Title: Chairman of the Board

Follow Wells Fargo & Company (NYSE:WFC)

Page 85 of 102