January 06, 2017
Jarrod Dyson
traded from
Royals 
to
Mariners
January 11, 2017
Drew Smyly
traded from
Rays
to
Mariners
Ryan Yarbrough
traded from
Mariners
to
Rays
March 01, 2017
Mariners
designate
Mike Freeman
for assignment
Drew Jackson
traded from
Mariners
to
Dodgers
Chase De Jong
traded from
Dodgers
to
Mariners
Aneurys Zabala
traded from
Mariners
to
Dodgers
March 31, 2017
Mariners
place
Drew Smyly
on the injured list
Mariners
place
Steve Cishek
on the injured list
April 11, 2017
Mariners
place
Jean Segura
on the injured list
Mariners
designate
Paul Fry
for assignment
April 14, 2017
Paul Fry
traded from
Mariners
to
Orioles
April 26, 2017
Mariners
place
Mitch Haniger
on the injured list
May 05, 2017
Mariners
place
James Paxton
on the injured list
May 06, 2017
Mariners
place
Evan Marshall
on the injured list
May 14, 2017
Mariners
place
Ryan Weber
on the injured list
May 16, 2017
Mariners
place
Robinson Cano
on the injured list
June 02, 2017
Mariners
place
Jean Segura
on the injured list
June 18, 2017
Mariners
sign
Wyatt Mills
Mariners
sign
Darren McCaughan
Mariners
sign
Evan White
Mariners
sign
Seth Elledge
June 19, 2017
Mariners
sign
Jack Larsen
June 24, 2017
Mariners
sign
Tommy Romero
July 02, 2017
Mariners
sign
Julio Rodriguez
July 20, 2017
Pablo Lopez
traded from
Mariners
to
Marlins
David Phelps
traded from
Marlins
to
Mariners
July 21, 2017
Tyler O'Neill
traded from
Mariners
to
Cardinals
Marco Gonzales
traded from
Cardinals
to
Mariners
July 28, 2017
Steve Cishek
traded from
Mariners
to
Rays
Erasmo Ramirez
traded from
Rays
to
Mariners
July 30, 2017
Mariners
place
Mitch Haniger
on the injured list
August 06, 2017
Luis Rengifo
traded from
Mariners
to
Rays
Anthony Misiewicz
traded from
Mariners
to
Rays
August 08, 2017
Mariners
place
David Phelps
on the injured list
August 11, 2017
Mariners
place
James Paxton
on the injured list
August 19, 2017
Mariners
place
Jarrod Dyson
on the injured list
August 24, 2017
September 01, 2017
Mariners
place
David Phelps
on the injured list
November 02, 2017
Jarrod Dyson
became a free agent
November 15, 2017
Emilio Pagan
traded from
Mariners
to
Athletics
November 18, 2017
JP Sears
traded from
Mariners
to
Yankees
December 01, 2017
Drew Smyly
became a free agent
December 07, 2017
Dee Strange-Gordon
traded from
Marlins
to
Mariners
Robert Dugger
traded from
Mariners
to
Marlins
Nick Neidert
traded from
Mariners
to
Marlins
December 10, 2017
Mariners
release
Seth Frankoff
December 13, 2017
Anthony Misiewicz
traded from
Rays
to
Mariners
Shawn Armstrong
traded from
Indians
to
Mariners
December 18, 2017
Mariners
release
Andrew Albers