January 14, 2015

Mike Kickham traded from Cubs  to Mariners 

March 05, 2015

Mariners  designate Ji-Man Choi for assignment

March 31, 2015

Erasmo Ramirez traded from Mariners  to Rays 

May 04, 2015

Mariners  designate Mike Kickham for assignment

May 29, 2015

Mariners  place James Paxton on the injured list

June 03, 2015

Dominic Leone traded from Mariners  to Diamondbacks 

June 15, 2015

Mariners  sign Art Warren

Mariners  sign Anthony Misiewicz

Mariners  sign Braden Bishop

Mariners  sign Drew Jackson

June 16, 2015

Mariners  sign Nick Neidert

Mariners  sign Ljay Newsome

July 31, 2015

Jake Brentz traded from Blue Jays  to Mariners 

November 05, 2015

Brad Miller traded from Mariners  to Rays 

November 12, 2015

Enyel De Los Santos traded from Mariners  to Padres 

November 16, 2015

Anthony Bass traded from Rangers  to Mariners 

November 23, 2015

Mariners  designate John Hicks for assignment

December 02, 2015

Patrick Kivlehan traded from Mariners  to Rangers 

December 07, 2015

December 09, 2015

Freddy Peralta traded from Mariners  to Brewers 

December 11, 2015

Ryne Harper traded from Braves  to Mariners 

December 14, 2015

Mariners  sign Steve Cishek as a free agent

December 17, 2015

Mariners  sign Blake Parker