February 04, 2013
Max Stassi
traded from
Athletics 
to
Astros
Jed Lowrie
traded from
Astros
to
Athletics
Brad Peacock
traded from
Athletics
to
Astros
April 20, 2013
Astros
place
J.D. Martinez
on the injured list
June 13, 2013
Astros
sign
Jason Martin
June 14, 2013
Astros
sign
Jacob Nottingham
June 16, 2013
Astros
sign
Jack Mayfield
June 19, 2013
Astros
sign
Mark Appel
June 24, 2013
Astros
designate
Wade LeBlanc
for assignment
July 02, 2013
Ronald Torreyes
traded from
Cubs
to
Astros
July 04, 2013
Astros
sign
Kent Emanuel
July 27, 2013
Astros
place
J.D. Martinez
on the injured list
July 31, 2013
Josh Hader
traded from
Orioles
to
Astros
August 20, 2013
Astros
designate
Wade LeBlanc
for assignment
August 23, 2013
Astros
place
Max Stassi
on the injured list
September 05, 2013
Astros
place
Max Stassi
on the injured list
September 13, 2013
David Paulino
traded from
Tigers
to
Astros
September 17, 2013
Astros
place
Jason Castro
on the injured list
September 24, 2013
Astros
sign
Bryan De La Cruz
November 11, 2013
Astros
sign
Bryan Abreu
December 03, 2013
Jordan Lyles
traded from
Astros
to
Rockies
Dexter Fowler
traded from
Rockies
to
Astros
December 11, 2013
Anthony Bass
traded from
Padres
to
Astros