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Transactions listed are from November 1 of previous year to April 1 of the following year.
October 7, 1988
Released Dave Concepcion.
October 15, 1988
Skeeter Barnes granted Free Agency.
Leo Garcia granted Free Agency.
Ron Roenicke granted Free Agency.
Max Venable granted Free Agency.
October 20, 1988
Traded Buddy Bell to the Houston Astros. Received a player to be named later. The Houston Astros sent Carl Grovom (minors) (October 20, 1988) to the Cincinnati Reds to complete the trade.
November 4, 1988
Dave Collins granted Free Agency.
Ron Oester granted Free Agency.
November 5, 1988
Signed Skeeter Barnes as a free agent.
November 8, 1988
Released Leon Durham.
December 2, 1988
Signed Rick Mahler as a free agent.
Signed Ron Oester as a free agent.
December 5, 1988
Mike Smith drafted by the Baltimore Orioles in the 1988 rule 5 draft.
December 7, 1988
Signed Dave Collins as a free agent.
December 8, 1988
Traded Lloyd McClendon to the Chicago Cubs. Received Rolando Roomes.
December 13, 1988
Traded Nick Esasky and Rob Murphy to the Boston Red Sox. Received a player to be named later, Todd Benzinger and Jeff Sellers. The Boston Red Sox sent Luis Vasquez (minors) (January 12, 1989) to the Cincinnati Reds to complete the trade.
December 16, 1988
Signed Mike Griffin as a free agent.
December 21, 1988
Released Ken Griffey.
Signed Manny Trillo as a free agent.
Released Frank Williams.
Signed Joel Youngblood as a free agent.
January 4, 1989
Signed Scotti Madison as a free agent.
March 25, 1989
Sold Jeff Treadway to the Atlanta Braves.
March 28, 1989
Released Randy St. Claire.
March 29, 1989
Released Don Wakamatsu.
March 30, 1989
Signed Ken Griffey as a free agent.
Signed Kent Tekulve as a free agent.
May 25, 1989 (Standings)
Released Manny Trillo.
June 5, 1989 (Standings)
Drafted Ross Powell in the 3rd round of the 1989 amateur draft.
Drafted Darron Cox in the 5th round of the 1989 amateur draft. Player signed June 10, 1989.
Drafted Tim Pugh in the 6th round of the 1989 amateur draft. Player signed June 7, 1989.
Drafted Trevor Hoffman in the 11th round of the 1989 amateur draft. Player signed June 9, 1989.
Drafted Scott Pose in the 34th round of the 1989 amateur draft. Player signed June 8, 1989.
Drafted Sean Lowe in the 43rd round of the 1989 amateur draft, but did not sign the player.
June 14, 1989 (Standings)
Signed Chris Hook as an amateur free agent.
June 23, 1989 (Standings)
Released Dave Collins.
July 13, 1989 (Standings)
Traded a player to be named later to the Philadelphia Phillies. Received Bob Sebra. The Cincinnati Reds sent Jeff Gray (September 6, 1989) to the Philadelphia Phillies to complete the trade.
July 18, 1989 (Standings)
Traded Kal Daniels and Lenny Harris to the Los Angeles Dodgers. Received Mariano Duncan and Tim Leary.
July 30, 1989 (Standings)
Signed Dave Collins as a free agent.
October 15, 1989 (Standings)
Mike Griffin granted Free Agency.
Scotti Madison granted Free Agency.
October 22, 1989
Skeeter Barnes granted Free Agency.
November 6, 1989
Signed Donnie Scott as a free agent.
November 13, 1989
Dave Collins granted Free Agency.
Bo Diaz granted Free Agency.
Joel Youngblood granted Free Agency.
December 4, 1989
Marty Brown drafted by the Baltimore Orioles in the 1989 rule 5 draft.
Drafted Tim Layana from the New York Yankees in the 1989 rule 5 draft.
December 6, 1989
Traded Don Brown (minors) and John Franco to the New York Mets. Received Kip Gross and Randy Myers.
December 12, 1989
Traded Tim Leary and Van Snider to the New York Yankees. Received Rodney Imes (minors) and Hal Morris.
January 5, 1990
Signed Paul Noce as a free agent.
January 29, 1990
Signed Skeeter Barnes as a free agent.