January 10, 2015
Daniel Robertson
traded from
Athletics 
to
Rays
January 14, 2015
Tyler Clippard
traded from
Nationals
to
Athletics
April 04, 2015
Athletics
place
Sean Nolin
on the injured list
Athletics
place
Josh Reddick
on the injured list
Athletics
place
Sean Doolittle
on the injured list
May 20, 2015
Athletics
place
Drew Pomeranz
on the injured list
May 22, 2015
Athletics
place
Tyler Ladendorf
on the injured list
May 30, 2015
Athletics
place
Sean Doolittle
on the injured list
June 12, 2015
Athletics
sign
James Naile
June 13, 2015
Athletics
sign
Seth Brown
June 20, 2015
June 30, 2015
Athletics
sign
Richie Martin
July 07, 2015
Athletics
sign
Ryan Brasier
July 11, 2015
Athletics
place
Jesse Hahn
on the injured list
July 23, 2015
Scott Kazmir
traded from
Athletics
to
Astros
Daniel Mengden
traded from
Astros
to
Athletics
Jacob Nottingham
traded from
Astros
to
Athletics
July 27, 2015
Tyler Clippard
traded from
Athletics
to
Mets
July 28, 2015
Aaron Brooks
traded from
Royals
to
Athletics
Sean Manaea
traded from
Royals
to
Athletics
August 24, 2015
Athletics
place
Kendall Graveman
on the injured list
September 10, 2015
Danny Coulombe
traded from
Dodgers
to
Athletics
September 16, 2015
Athletics
place
Jesse Chavez
on the injured list
November 20, 2015
Athletics
designate
Fernando Abad
for assignment
Jesse Chavez
traded from
Athletics
to
Blue Jays
Liam Hendriks
traded from
Blue Jays
to
Athletics
Athletics
sign
Rich Hill
as a free agent
November 25, 2015
Athletics
designate
Danny Coulombe
for assignment
Jed Lowrie
traded from
Astros
to
Athletics
December 02, 2015
Drew Pomeranz
traded from
Athletics
to
Padres
December 09, 2015
J.B. Wendelken
traded from
White Sox
to
Athletics
December 11, 2015
Athletics
sign
John Axford
as a free agent