January 06, 2018
Cardinals 
sign
Preston Guilmet
January 19, 2018
Dominic Leone
traded from
Blue Jays
to
Cardinals
Conner Greene
traded from
Blue Jays
to
Cardinals
Randal Grichuk
traded from
Cardinals
to
Blue Jays
March 28, 2018
Cardinals
place
Adam Wainwright
on the injured list
Cardinals
place
Alex Reyes
on the injured list
Cardinals
designate
Breyvic Valera
for assignment
March 31, 2018
Cardinals
sign
Greg Holland
as a free agent
April 01, 2018
Breyvic Valera
traded from
Cardinals
to
Dodgers
April 08, 2018
Cardinals
place
Ryan Sherriff
on the injured list
April 22, 2018
Cardinals
place
Adam Wainwright
on the injured list
May 06, 2018
Cardinals
place
Dominic Leone
on the injured list
Cardinals
place
Yadier Molina
on the injured list
May 10, 2018
Cardinals
place
Carlos Martinez
on the injured list
May 15, 2018
Cardinals
place
Adam Wainwright
on the injured list
May 17, 2018
Cardinals
place
Carson Kelly
on the injured list
May 18, 2018
Cardinals
place
Paul DeJong
on the injured list
May 26, 2018
Cardinals
place
Greg Holland
on the injured list
May 31, 2018
Cardinals
place
Alex Reyes
on the injured list
June 07, 2018
Cardinals
designate
Preston Guilmet
for assignment
June 13, 2018
Cardinals
sign
Nolan Gorman
June 14, 2018
Cardinals
sign
Brendan Donovan
Cardinals
sign
Lars Nootbaar
June 21, 2018
Cardinals
place
Michael Wacha
on the injured list
July 05, 2018
Cardinals
place
Tyler O'Neill
on the injured list
July 21, 2018
Cardinals
place
Carlos Martinez
on the injured list
July 23, 2018
Cardinals
place
Kolten Wong
on the injured list
July 27, 2018
Cardinals
designate
Greg Holland
for assignment
Seth Elledge
traded from
Mariners
to
Cardinals
July 29, 2018
Chasen Shreve
traded from
Yankees
to
Cardinals
Giovanny Gallegos
traded from
Yankees
to
Cardinals
July 31, 2018
Cardinals
place
Carlos Martinez
on the injured list
Justin Williams
traded from
Rays
to
Cardinals
Roel Ramirez
traded from
Rays
to
Cardinals
Tommy Pham
traded from
Cardinals
to
Rays
Genesis Cabrera
traded from
Rays
to
Cardinals
Conner Capel
traded from
Indians
to
Cardinals
Oscar Mercado
traded from
Cardinals
to
Indians
August 01, 2018
Cardinals
release
Greg Holland
August 04, 2018
Cardinals
place
Dexter Fowler
on the injured list
August 06, 2018
Cardinals
place
John Brebbia
on the injured list
Cardinals
place
Tyler O'Neill
on the injured list
August 11, 2018
Cardinals
place
Yairo Munoz
on the injured list
August 22, 2018
Cardinals
place
Marcell Ozuna
on the injured list
August 26, 2018
Cardinals
place
Mike Mayers
on the injured list
Cardinals
release
Ryan Sherriff
August 28, 2018
Cardinals
place
Kolten Wong
on the injured list
October 29, 2018
Adam Wainwright
became a free agent
Matt Adams
became a free agent
October 30, 2018
Cardinals
sign
Adam Wainwright
as a free agent
November 20, 2018
Cardinals
designate
Conner Greene
for assignment
December 05, 2018
Paul Goldschmidt
traded from
Diamondbacks
to
Cardinals
Luke Weaver
traded from
Cardinals
to
Diamondbacks
Carson Kelly
traded from
Cardinals
to
Diamondbacks
Andy Young
traded from
Cardinals
to
Diamondbacks
December 11, 2018
Patrick Wisdom
traded from
Cardinals
to
Rangers
December 21, 2018
Cardinals
designate
Ryan Meisinger
for assignment
Cardinals
sign
Andrew Miller
as a free agent