January 24, 2019

Athletics  sign Kyle Lobstein

Athletics  sign Eric Campbell

February 13, 2019

Athletics  place Sean Manaea on the injured list

Athletics  sign Brett Anderson as a free agent

February 15, 2019

Athletics  sign Robbie Grossman as a free agent

March 19, 2019

Athletics  place Jharel Cotton on the injured list

Athletics  place Nick Martini on the injured list

March 27, 2019

Athletics  place Chris Bassitt on the injured list

Athletics  place Matt Olson on the injured list

April 29, 2019

Athletics  place Mark Canha on the injured list

May 24, 2019

Athletics  place Khris Davis on the injured list

June 23, 2019

Athletics  place Blake Treinen on the injured list

June 30, 2019

Athletics  place Stephen Piscotty on the injured list

July 03, 2019

Athletics  designate Aaron Brooks for assignment

July 27, 2019

July 31, 2019

Athletics  place Ramon Laureano on the injured list

Tanner Roark traded from Reds  to Athletics 

August 16, 2019

Athletics  designate Dustin Garneau for assignment

August 17, 2019

Athletics  sign Matt Harvey

August 26, 2019

Athletics  place Stephen Piscotty on the injured list

Athletics  designate Nick Martini for assignment

September 01, 2019

Athletics  designate Tanner Anderson for assignment

September 09, 2019

Athletics  place Luis Barrera on the injured list

October 03, 2019

Athletics  place Lou Trivino on the injured list

October 31, 2019

Jake Diekman became a free agent

Tanner Roark became a free agent

Brett Anderson became a free agent

November 18, 2019

Athletics  sign Lucas Luetge

November 20, 2019

Athletics  designate Jharel Cotton for assignment

November 22, 2019

Athletics  sign Ryan Goins

November 23, 2019

Jharel Cotton traded from Athletics  to Cubs 

December 02, 2019

Blake Treinen became a free agent

Ryan Buchter became a free agent

December 03, 2019

Athletics  sign Jordan Weems

Athletics  sign Jake Diekman as a free agent

Athletics  sign Dillon Thomas

December 12, 2019

Vimael Machin traded from Phillies  to Athletics