May 25, 2010

Astros  sign Jandel Gustave as a free agent

June 15, 2010

Astros  sign R.J. Alaniz

June 18, 2010

Astros  sign Mike Foltynewicz

June 25, 2010

Astros  sign Vince Velasquez

July 29, 2010

J.A. Happ traded from Phillies  to Astros 

July 31, 2010

Mark Melancon traded from Yankees  to Astros 

August 05, 2010

Astros  sign Delino DeShields