January 10, 2018

Athletics  sign Nick Martini

January 29, 2018

March 12, 2018

Athletics  sign Jonathan Lucroy as a free agent

March 19, 2018

Athletics  place Jharel Cotton on the injured list

Athletics  sign Trevor Cahill as a free agent

March 20, 2018

Athletics  sign Brett Anderson

March 28, 2018

Athletics  place Paul Blackburn on the injured list

Athletics  place Renato Nunez on the injured list

April 02, 2018

Athletics  sign Dairon Blanco

April 07, 2018

Athletics  place Chad Pinder on the injured list

April 14, 2018

Athletics  place Liam Hendriks on the injured list

April 17, 2018

Athletics  designate Trayce Thompson for assignment

April 19, 2018

Trayce Thompson traded from Athletics  to White Sox 

April 27, 2018

Athletics  place Ryan Buchter on the injured list

May 09, 2018

Athletics  place Trevor Cahill on the injured list

May 19, 2018

Athletics  place Brett Anderson on the injured list

May 21, 2018

Athletics  designate Dustin Garneau for assignment

May 23, 2018

Athletics  place Khris Davis on the injured list

June 06, 2018

Athletics  place Matthew Joyce on the injured list

June 10, 2018

Athletics  sign Alfonso Rivas

June 14, 2018

Athletics  place Trevor Cahill on the injured list

June 15, 2018

Athletics  sign Jonah Bride

June 16, 2018

Athletics  place Matt Chapman on the injured list

June 25, 2018

Athletics  designate Liam Hendriks for assignment

June 27, 2018

Athletics  place Daniel Mengden on the injured list

July 07, 2018

Athletics  place Matthew Joyce on the injured list

July 08, 2018

Athletics  place Paul Blackburn on the injured list

July 21, 2018

Jeurys Familia traded from Mets  to Athletics 

July 29, 2018

Athletics  place Chad Pinder on the injured list

August 06, 2018

Mike Fiers traded from Tigers  to Athletics 

August 26, 2018

Athletics  place Sean Manaea on the injured list

August 28, 2018

Athletics  place Brett Anderson on the injured list

September 01, 2018

Athletics  place Kendall Graveman on the injured list

September 03, 2018

Athletics  designate Danny Coulombe for assignment

Aaron Brooks traded from Brewers  to Athletics 

October 29, 2018

Brett Anderson became a free agent

Jed Lowrie became a free agent

Jeurys Familia became a free agent

Matthew Joyce became a free agent

Jonathan Lucroy became a free agent

Trevor Cahill became a free agent

November 20, 2018

Tanner Anderson traded from Pirates  to Athletics 

November 30, 2018

Mike Fiers became a free agent

Kendall Graveman became a free agent

December 21, 2018

Athletics  sign Joakim Soria as a free agent

December 24, 2018

Athletics  sign Mike Fiers as a free agent