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Updated:  July 6, 2017

October 16, 1984 – (Sonics) – 1986 1st Round Draft Pick to Boston Celtics for Gerald Henderson
August 19, 1986 – (Mariners) – Dave Henderson & Spike Owen to Boston Red Sox for Rey Quinones, Mike Brown, Mike Trujillo, & John Christensen
April 28, 1987 – (Seahawks) – Brian Bosworth, 1st Round Supplemental Draft Pick
June 22, 1987 – (Sonics) – Scottie Pippen to Chicago Bulls for Olden Polynice
April 23, 1988 – (Seahawks) – Undisclosed Draft Picks to Phoenix Cardinals for Kelly Stouffer

April 21, 1991 – (Seahawks) – Dan McGwire, 1st Round Draft Pick
June 26, 1991 – (Sonics) – Rich King 1st Round Draft Pick
December 11, 1991 – (Mariners) – Bill Swift, Michael Jackson & Dave Burba to San Francisco Giants for Kevin Mitchell & Mike Remlinger
April 25, 1993 – (Seahawks) – Rick Mirer, 1st Round Draft Pick
September 1, 1993 – (Sonics) – Dana Barros, Eddie Johnson & 1st Round Pick to Charlotte Hornets for Kendall Gill & 1st Round Pick
December 10, 1993 – (Mariners) – Mike Hampton & Mike Felder to Houston Astros for Eric Anthony
December 20, 1993 – (Mariners) – Omar Vizquel to Cleveland Indians for Felix Fermin & Reggie Jefferson
February 25, 1994 – (Seahawks) – Nate Odomes signs 4-year, $8.4 million deal
July 18, 1994 – (Sonics) – Ricky Pierce, Carlos Rogers & Two 1995 2nd Round Picks to Golden State Warriors for Sarunas Marciulionis & Byron Houston
May 21, 1995 – (Mariners) – Shawn Estes & Wilson Delgado to San Francisco Giants for Salomon Torres
December 7, 1995 – (Mariners) – Tino Martinez, Jim Mecir & Jeff Nelson to New York Yankees for Sterling Hitchcock & Russ Davis
July 22, 1996 – (Sonics) – Jim McIlvaine signs 7-year $33.6 million deal
September 13, 1996 – (Mariners) – David Arias to Minnesota Twins for Dave Hollins
February 20, 1997 – (Mariners) – Dennis Martinez signs 1-year, $250,000 deal
July 31, 1997 – (Mariners) – Derek Lowe & Jason Varitek to Boston Red Sox for Heathcliff Slocumb
July 31, 1997 – (Mariners) – Jose Cruz Jr. to Toronto Blue Jays for Paul Spoljaric & Mike Timlin
September 25, 1997 – (Sonics) – Shawn Kemp to Cleveland Cavaliers for Vin Baker (from Milwaukee Bucks in a 3-way deal)
February 6, 1998 – (Mariners) – Bobby Ayala re-signs for 2-year, $3.3 million deal
February 14, 1998 – (Mariners) – Bill Swift signs 1-year, $425,000 deal
July 31, 1998 – (Mariners) – Randy Johnson to Houston Astros for Freddy Garcia, John Halama, & Carlos Guillen
November 13, 1998 – (Mariners) – Jose Mesa signs 2-year, $6.8 million deal
April 17, 1999 – (Seahawks) – Lamar King, 1st Round Draft Pick
August 9, 1999 – (Sonics) – Vernon Maxwell signs 3-year $5 million deal
August 18, 1999 – (Sonics) – Vin Baker re-signs for 7-year $86 million deal

April 14, 2000 – (Seahawks) – Ahman Green & 5th Round Pick to Green Bay Packers for Fred Vinson & 6th Round Pick
April 15, 2000 – (Seahawks) – Chris McIntosh, 1st Round Draft Pick
July 31, 2000 – (Mariners) – John Mabry & Tom Davey to San Diego Padres for Al Martin
September 20, 2000 – (Sonics) – Emanual Davis, Greg Foster, Horace Grant & Chuck Person to Los Angeles Lakers; Lazaro Borrell, Vernon Maxwell, Vladimir Stepania & Two 2001 2nd Round Draft Picks + One 2002 1st Round Draft Pick to New York Knicks for Patrick Ewing
October 18, 2000 – (Mariners) – Damaso Marte granted Free Agency
December 21, 2000 – (Mariners) – Raul Ibanez granted Free Agency
April 21, 2001 – (Seahawks) – Koren Robinson, 1st Round Draft Pick
June 5, 2001 – (Mariners) – Michael Garciaparra, 1st Round Draft Pick
June 27, 2001 – (Sonics) – Vladimir Radmanovic, 1st Round Draft Pick
July 31, 2001 – (Sonics) – Calvin Booth signs 6-year $34 million deal
December 16, 2001 – (Mariners) – Brian Fuentes, Jose Paniagua & Denny Stark to Colorado Rockies for Jeff Cirillo
January 30, 2002 – (Mariners) – James Baldwin signs 1-year, $1.25 million deal
April 20, 2002 – (Seahawks) – Jerramy Stevens, 1st Round Draft Pick
July 18, 2002 – (Sonics) – Jerome James re-signs 3-year $15 million deal
June 26, 2003 – (Sonics) – Luke Ridnour, 1st Round Draft Pick
December 19, 2003 – (Mariners) – Scott Spiezio Signs 3-year $9.15 million deal
January 8, 2004 – (Mariners) – Carlos Guillen to Detroit Tigers for Juan Gonzalez & Ramon Santiago
January 8, 2004 – (Mariners) – Rich Aurilia Signs 1-year $3.5 million deal
January 20, 2004 – (Mariners) – Joel Pineiro re-signs for 3-year, $14.5 million deal
March 4, 2004 – (Seahawks) – Grant Wistrom signs 6-year, $33 million deal
April 24, 2004 – (Seahawks) – Marcus Tubbs, 1st Round Draft Pick
June 24, 2004 – (Sonics) – Robert Swift, 1st Round Draft Pick
June 27, 2004 – (Mariners) – Freddy Garcia & Ben Davis to Chicago White Sox for Jeremy Reed, Mike Morse & Miguel Olivo
December 15, 2004 – (Mariners) – Richie Sexson Signs 4-year $50 million deal
December 17, 2004 – (Mariners) – Adrian Beltre Signs 5-year $64 million deal
January 4, 2005 – (Mariners) – Pokey Reese Signs 1-year $1.2 million deal
January 19, 2005 – (Mariners) – Aaron Sele signs 1-year, $700,000 deal
June 7, 2005 – (Mariners) – Jeff Clement, 1st Round Draft Pick
June 28, 2005 – (Sonics) – Johan Petro, 1st Round Draft Pick
July 30, 2005 – (Mariners) – Randy Winn to San Francisco Giants for Jesse Foppert & Yorvit Torrealba
December 22, 2005 – (Mariners) – Jarrod Washburn Signs 4-year $37.5 million deal
January 4, 2006 – (Mariners) – Carl Everett Signs 1-year $3.4 million deal
February 23, 2006 – (Seahawks) – Steve Hutchinson assigned Transition Tag
March 5, 2006 – (Seahawks) – Shaun Alexander re-signs for 8-year, $62 million deal
March 20, 2006 – (Mariners) – Matt Thornton to Chicago White Sox for Joe Borchard
March 24, 2006 – (Seahawks) – Nate Burleson signs 7-year, $49 million deal
April 29, 2006 – (Seahawks) – Kelly Jennings, 1st Round Draft Pick
June 6, 2006 – (Mariners) – Brandon Morrow, 1st Round Draft Pick
June 28, 2006 – (Sonics) – Mouhamed Sene, 1st Round Draft Pick
June 30, 2006 – (Mariners) – Asdrubal Cabrera to Cleveland Indians for Eduardo Perez
July 26, 2006 – (Mariners) – Shin-Soo Choo to Cleveland Indians for Ben Broussard
September 11, 2006 – (Seahawks) – 1st Round Pick in 2007 to New England Patriots for Deion Branch
December 7, 2006 – (Mariners) – Rafael Soriano to Atlanta Braves for Horacio Ramirez
December 14, 2006 – (Mariners) – Miguel Batista Signs 3-year $24 million deal
December 18, 2006 – (Mariners) – Emiliano Fruto & Chris Snelling to Washington Nationals for Jose Vidro
January 30, 2007 – (Mariners) – Jeff Weaver Signs 1-year $8.3 million deal
July 13, 2007 – (Mariners) – Ichiro re-signs for 5-year, $90 million deal
October 30, 2007 – (Mariners) – Jose Guillen granted Free Agency
December 20, 2007 – (Mariners) – Carlos Silva Signs 4-year $48 million deal
January 31, 2008 – (Mariners) – Brad Wilkerson Signs 1-year $3 million deal
February 8, 2008 – (Mariners) – Adam Jones, George Sherrill, Chris Tillman, Kam Mickolio & Tony Butler to Baltimore Orioles for Erik Bedard
March 4, 2008 – (Seahawks) – T.J. Duckett signs 5-year, $14 million deal
March 7, 2008 – (Seahawks) – Julius Jones signs 4-year, $11.8 million deal
April 25, 2008 – (Mariners) – Kenji Johjima re-signs for 3-year, $24 million deal
March 2, 2009 – (Seahawks) – T.J. Houshmandzadeh signs 5-year, $40 million deal
April 25, 2009 – (Seahawks) – Aaron Curry, 1st Round Draft Pick
June 9, 2009 – (Mariners *JZ*) – Dustin Ackley, 1st Round Draft Pick
November 11, 2009 – (Mariners) – Ken Griffey Jr. re-signs for 1-year, $2.35 million deal
December 8, 2009 – (Mariners) – Chone Figgins signs 4-year, $36 million deal

January 29, 2010 – (Mariners) – Eric Byrnes signs 1-year, $400,000 deal
March 17, 2010 – (Seahawks) – #40 overall draft pick & 2011 3rd round draft pick to San Diego Chargers for Charlie Whitehurst & #60 overall draft pick; Whitehurst signed to 2-year, $8 million deal
July 9, 2010 – (Mariners) – Cliff Lee & Mark Lowe to Texas Rangers for Justin Smoak, Blake Beavan, Josh Lueke, and Matt Lawson
June 6, 2011 – (Mariners) – Danny Hultzen, 1st Round Draft Pick
July 30, 2011 – (Mariners) – Doug Fister & David Pauley to Detroit Tigers for Charlie Furbush, Chance Ruffin, Casper Wells, and Francisco Martinez
January 23, 2012 – (Mariners) – Michael Pineda & Jose Campos to New York Yankees for Jesus Montero and Hector Noesi
March 11, 2013 – (Seahawks) – #25 & #214 overall draft picks & 2014 3rd round draft pick to Minnesota Vikings for Percy Harvin; Harvin signed to 6-year, $67 million deal