April 06, 2012

Astros  place Jed Lowrie on the injured list

May 27, 2012

Astros  place Fernando Abad on the injured list

May 31, 2012

Astros  sign Elieser Hernandez

June 07, 2012

Astros  sign Carlos Correa

June 08, 2012

Astros  place Marwin Gonzalez on the injured list

June 13, 2012

Astros  sign Brett Phillips

June 18, 2012

Astros  sign Lance McCullers

June 22, 2012

Astros  sign Tyler Heineman

June 25, 2012

Astros  sign Rio Ruiz

July 15, 2012

Astros  place Jason Castro on the injured list

Astros  place Jed Lowrie on the injured list

July 20, 2012

J.A. Happ traded from Astros  to Blue Jays 

July 25, 2012

Robbie Grossman traded from Pirates  to Astros 

August 03, 2012

Chris Devenski traded from White Sox  to Astros 

November 01, 2012

Fernando Abad became a free agent