| | | Tuesday, September 23rd, 1975 | | Placed SP Chuck Dobson on the 15-day disabled list, retroactive to 09/13/1975. |
| Monday, September 22nd, 1975 | | Signed SP Steve Carlton to a 3-year contract extension worth a total of $16,500,000. |
| Tuesday, August 5th, 1975 | | Signed CF Jim Holt to a 2-year contract extension worth a total of $1,000,000. |
| Friday, August 1st, 1975 | | Traded 29-year-old second baseman Billy Grabarkewitz, 22-year-old minor league right fielder Dwight Evans and a 4th round draft pick to the Chicago Colts, getting 31-year-old right fielder Ollie Brown, 22-year-old third baseman Buddy Bell, a 2nd round draft pick and a 2nd round draft pick in return. |
| Friday, July 11th, 1975 | | Signed 1B Ron Fairly to a 1-year contract extension worth a total of $960,000. |
| Friday, May 16th, 1975 | | Traded 28-year-old third baseman Bill Melton and a 2nd round draft pick to the Chicago Colts, getting 26-year-old starting pitcher Bill Gogolewski and a 2nd round draft pick in return. |
| Sunday, April 27th, 1975 | | Signed MR Dave Giusti to a 1-year contract extension worth a total of $2,990,000. |
| Monday, April 21st, 1975 | | Signed 3B Bill Melton to a 5-year contract extension worth a total of $17,150,000. |
| Sunday, April 20th, 1975 | | Signed SS Billy Grabarkewitz to a 5-year contract extension worth a total of $13,000,000. |
| Saturday, April 5th, 1975 | | Signed SP Don Sutton to a 3-year contract extension worth a total of $11,310,000. | | Signed CL Ken Tatum to a 4-year contract extension worth a total of $17,000,000. | | Signed 1B Steve Garvey to a 4-year contract extension worth a total of $28,800,000. |
| Tuesday, February 25th, 1975 | | Traded 23-year-old right fielder Ken Griffey, 35-year-old left fielder Lou Brock, 22-year-old third baseman Steve Ontiveros, 20-year-old starting pitcher Kevin Kobel and 25-year-old reliever Al Santorini to the Denver 14ers, getting 25-year-old right fielder Tom Grieve, 37-year-old minor league left fielder Curt Flood, 27-year-old starting pitcher Joe Coleman, a 2nd round draft pick, a 3rd round draft pick and a 4th round draft pick in return. | | Traded a 2nd round draft pick and a 3rd round draft pick to the Atlanta Hilltoppers, getting 29-year-old starting pitcher Steve Carlton in return. | | Traded a 1st round draft pick and a 4th round draft pick to the Los Angeles Outlaws, getting 23-year-old starting pitcher Glenn Abbott in return. |
| Wednesday, February 19th, 1975 | | Signed free agent SP Gary Ross to a 3-year contract worth a total of $1,560,000. | | Signed free agent SP Bill Lee to a 2-year contract worth a total of $1,240,000. |
| Friday, November 1st, 1974 | | C C. Fisk received a 1-year contract through automatic renewal worth a total of $2,300,000. | | MR A. Santorini received a 1-year contract through automatic renewal worth a total of $576,000. | | C D. Dietz received a 1-year contract through automatic renewal worth a total of $1,000,000. | | SS D. Chaney received a 1-year contract through automatic renewal worth a total of $350,000. | | SP S. Rogers received a 1-year contract through automatic renewal worth a total of $2,300,000. | | MR B. Campbell received a 1-year contract through automatic renewal worth a total of $2,000,000. | | RF K. Griffey received a 1-year contract through automatic renewal worth a total of $2,000,000. | | SP D. Gullett received a 1-year contract through automatic renewal worth a total of $350,000. | | SP K. Brett received a 1-year contract through automatic renewal worth a total of $350,000. | | CF J. Holt received a 1-year contract through automatic renewal worth a total of $350,000. | | 2B C. Robinson received a 1-year contract through automatic renewal worth a total of $500,000. | | 3B B. Melton received a 1-year contract through automatic renewal worth a total of $1,000,000. | | MR B. Capra received a 1-year contract through automatic renewal worth a total of $350,000. | | SS B. Grabarkewitz received a 1-year contract through automatic renewal worth a total of $2,000,000. | | MR E. Farmer received a 1-year contract through automatic renewal worth a total of $350,000. | | CF G. Thomas received a 1-year contract through automatic renewal worth a total of $2,200,000. | | SP D. Rau received a 1-year contract through automatic renewal worth a total of $1,000,000. |
| Tuesday, October 29th, 1974 | | CL K. Tatum received a 1-year contract through arbitration worth a total of $3,752,000. | | MR D. Giusti received a 1-year contract through arbitration worth a total of $2,500,400. | | 1B S. Garvey received a 1-year contract through arbitration worth a total of $6,000,000. |
| Thursday, August 1st, 1974 | | Traded 33-year-old minor league closer C. Cox, 27-year-old minor league first baseman T. Muser, 25-year-old minor league left fielder L. Lacy, 30-year-old minor league starting pitcher W. Blasingame, a 2nd round draft pick, a 3rd round draft pick and a 4th round draft pick to the Montréal Voyageurs, getting 20-year-old third baseman G. Brett, 23-year-old reliever E. Farmer, 20-year-old minor league catcher T. Blackwell, 26-year-old shortstop E. Leon and a 1st round draft pick in return. |
| Tuesday, July 9th, 1974 | | Signed LF L. Brock to a 2-year contract extension worth a total of $17,160,000. |
| Wednesday, February 20th, 1974 | | Traded 28-year-old starting pitcher T. Seaver, a 2nd round draft pick and a 3rd round draft pick to the Boston Federals, getting 25-year-old minor league third baseman C. Robinson and a 4th round draft pick in return. | | Traded 34-year-old shortstop Z. Versalles to the Cleveland Barons, getting a 3rd round draft pick and a 4th round draft pick in return. |
| Wednesday, February 6th, 1974 | | Signed free agent SP D. Drysdale to a 2-year contract worth a total of $8,302,000. | | Signed free agent SS L. Brown to a 1-year contract worth a total of $1,700,000. | | Signed free agent RF R. Fairly to a 1-year contract worth a total of $1,820,000. | | Signed free agent SP W. Blasingame to a 1-year contract worth a total of $959,000. | | Signed free agent MR C. Cox to a 2-year contract worth a total of $1,500,000. |
| Tuesday, February 5th, 1974 | | Signed free agent RF L. Lacy to a 1-year contract worth a total of $1,100,000. |
| Monday, November 5th, 1973 | | C C. Fisk received a 1-year contract through automatic renewal worth a total of $2,300,000. | | MR A. Santorini received a 1-year contract through automatic renewal worth a total of $576,000. | | SP C. Dobson received a 1-year contract through automatic renewal worth a total of $500,000. | | SP S. Rogers received a 1-year contract through automatic renewal worth a total of $2,300,000. | | LF K. Griffey received a 1-year contract through automatic renewal worth a total of $2,000,000. | | 1B S. Garvey received a 1-year contract through automatic renewal worth a total of $1,000,000. | | MR F. Scherman received a 1-year contract through automatic renewal worth a total of $411,000. | | SP K. Brett received a 1-year contract through automatic renewal worth a total of $300,000. | | 1B J. Holt received a 1-year contract through automatic renewal worth a total of $300,000. | | SS D. Chaney received a 1-year contract through automatic renewal worth a total of $300,000. | | 3B B. Melton received a 1-year contract through automatic renewal worth a total of $1,000,000. | | MR B. Capra received a 1-year contract through automatic renewal worth a total of $300,000. | | 2B B. Grabarkewitz received a 1-year contract through automatic renewal worth a total of $2,000,000. | | RF D. Evans received a 1-year contract through automatic renewal worth a total of $1,500,000. | | CF G. Thomas received a 1-year contract through automatic renewal worth a total of $2,200,000. | | SS L. Bowa received a 1-year contract through automatic renewal worth a total of $300,000. | | MR B. Campbell received a 1-year contract through automatic renewal worth a total of $2,000,000. |
| Saturday, November 3rd, 1973 | | Traded 24-year-old starting pitcher M. Nagy and a 3rd round draft pick to the Montréal Voyageurs, getting 29-year-old starting pitcher C. Dobson in return. |
| Friday, November 2nd, 1973 | | LF R. White becomes a free-agent. | | SP T. Seaver received a 1-year contract through arbitration worth a total of $2,100,000. |
| Sunday, October 7th, 1973 | | Signed CL K. Tatum to a 1-year contract extension worth a total of $3,260,000. |
| Saturday, June 16th, 1973 | | Traded 34-year-old left fielder V. Pinson and 30-year-old reliever C. Upshaw to the Cleveland Barons, getting 30-year-old minor league third baseman P. Schaal, 38-year-old minor league starting pitcher P. Ramos, a 1st round draft pick and a 2nd round draft pick in return. | | Traded 33-year-old starting pitcher P. Niekro to the Los Angeles Outlaws, getting 20-year-old minor league right fielder D. Evans, a 2nd round draft pick and a 3rd round draft pick in return. | | Demoted RF D. Evans to Triple A Havana. |
| Saturday, June 2nd, 1973 | | Signed CF V. Pinson to a 2-year contract extension worth a total of $18,450,000. |
| Thursday, February 15th, 1973 | | Signed free agent 2B C. Schilling to a 1-year contract worth a total of $900,000. | | Signed free agent LF C. Yastrzemski to a 2-year contract worth a total of $3,880,000. |
| Tuesday, February 6th, 1973 | | Signed free agent MR D. Kelley to a 1-year contract worth a total of $411,000. | | Signed free agent C D. Sims to a 1-year contract worth a total of $876,000. | | Signed free agent MR F. Scherman to a 1-year contract worth a total of $411,000. | | Signed free agent MR A. Santorini to a 1-year contract worth a total of $576,000. |
| Thursday, February 1st, 1973 | | Traded 25-year-old catcher E. Rodriguez, 22-year-old reliever R. Moret, 22-year-old minor league first baseman D. Baylor, a 3rd round draft pick and a 4th round draft pick to the St. Louis Maroons, getting 27-year-old starting pitcher D. Sutton, 29-year-old left fielder R. White and a 1st round draft pick in return. |
| Sunday, November 5th, 1972 | | C C. Fisk received a 1-year contract through automatic renewal worth a total of $2,300,000. | | MR R. Moret received a 1-year contract through automatic renewal worth a total of $300,000. | | CL K. Tatum received a 1-year contract through automatic renewal worth a total of $1,500,000. | | 1B S. Garvey received a 1-year contract through automatic renewal worth a total of $1,000,000. | | RF J. Holt received a 1-year contract through automatic renewal worth a total of $300,000. | | 2B D. Johnson received a 1-year contract through automatic renewal worth a total of $500,000. | | MR L. Gura received a 1-year contract through automatic renewal worth a total of $300,000. | | C E. Rodriguez received a 1-year contract through automatic renewal worth a total of $300,000. | | 3B B. Melton received a 1-year contract through automatic renewal worth a total of $1,000,000. | | SS B. Robertson received a 1-year contract through automatic renewal worth a total of $300,000. | | MR B. Capra received a 1-year contract through automatic renewal worth a total of $300,000. | | SS B. Grabarkewitz received a 1-year contract through automatic renewal worth a total of $2,000,000. | | C E. Williams received a 1-year contract through automatic renewal worth a total of $300,000. | | LF D. Baker received a 1-year contract through automatic renewal worth a total of $2,000,000. | | 3B A. Gallagher received a 1-year contract through automatic renewal worth a total of $300,000. | | RF K. Harrelson received a 1-year contract through automatic renewal worth a total of $300,000. | | MR M. Nagy received a 1-year contract through automatic renewal worth a total of $300,000. | | SP D. Gullett received a 1-year contract through automatic renewal worth a total of $300,000. | | SP K. Brett received a 1-year contract through automatic renewal worth a total of $300,000. |
| Thursday, November 2nd, 1972 | | Released 1B M. Hegan. | | LF R. Swoboda received a 1-year contract through arbitration worth a total of $468,000. | | SP P. Niekro received a 1-year contract through arbitration worth a total of $1,800,000. | | SP J. Nash received a 1-year contract through arbitration worth a total of $2,864,000. | | SP T. Seaver received a 1-year contract through arbitration worth a total of $2,000,000. |
| Tuesday, September 19th, 1972 | | Signed SP C. Upshaw to a 2-year contract extension worth a total of $6,140,000. |
| Tuesday, August 1st, 1972 | | Traded 33-year-old third baseman P. Ward and 25-year-old reliever J. Decker to the Chicago Colts, getting a 3rd round draft pick, a 2nd round draft pick and a 4th round draft pick in return. |
| Sunday, July 16th, 1972 | | Traded 39-year-old second baseman E. Charles and a 3rd round draft pick to the Washington Monuments, getting 23-year-old minor league starting pitcher M. Nagy, a 2nd round draft pick and a 3rd round draft pick in return. | | Traded 32-year-old third baseman R. Santo, 31-year-old shortstop R. Hunt, a 4th round draft pick and $3,800,000 in cash to the Los Angeles Outlaws, getting 27-year-old closer K. Tatum, 26-year-old third baseman B. Melton and 26-year-old third baseman B. Grabarkewitz in return. | | Placed 3B B. Grabarkewitz on the 15-day disabled list. |
| Thursday, May 18th, 1972 | | Signed 2B R. Hunt to a 3-year contract extension worth a total of $19,020,000. |
| Wednesday, March 1st, 1972 | | Traded 31-year-old minor league reliever J. Aker, 35-year-old minor league second baseman B. Johnson and 28-year-old minor league catcher J. Hiatt to the St. Louis Maroons, getting 28-year-old first baseman M. Hegan in return. |
| Saturday, February 19th, 1972 | | Signed free agent 3B E. Charles to a 1-year contract worth a total of $1,610,000. |
| Saturday, February 12th, 1972 | | Signed free agent RF W. Horton to a 2-year contract worth a total of $1,460,000. |
| Sunday, February 6th, 1972 | | Signed free agent LF R. Swoboda to a 1-year contract worth a total of $520,000. | | Signed free agent 1B B. Robertson to a 1-year contract worth a total of $300,000. |
| Monday, November 1st, 1971 | | MR J. Bouton received a 1-year contract through automatic renewal worth a total of $300,000. | | SP M. Lolich received a 1-year contract through automatic renewal worth a total of $1,000,000. | | 3B A. Gallagher received a 1-year contract through automatic renewal worth a total of $300,000. | | SP P. Niekro received a 1-year contract through automatic renewal worth a total of $2,000,000. | | CL C. Upshaw received a 1-year contract through automatic renewal worth a total of $2,000,000. | | RF J. Holt received a 1-year contract through automatic renewal worth a total of $300,000. | | LF D. Baylor received a 1-year contract through automatic renewal worth a total of $300,000. | | C E. Rodriguez received a 1-year contract through automatic renewal worth a total of $300,000. | | SP T. Seaver received a 1-year contract through automatic renewal worth a total of $2,200,000. | | SP J. Horlen received a 1-year contract through automatic renewal worth a total of $400,000. | | MR B. Capra received a 1-year contract through automatic renewal worth a total of $300,000. | | 1B S. Garvey received a 1-year contract through automatic renewal worth a total of $1,000,000. | | SS L. Bowa received a 1-year contract through automatic renewal worth a total of $300,000. | | SP J. Nash received a 1-year contract through automatic renewal worth a total of $1,500,000. | | C E. Williams received a 1-year contract through automatic renewal worth a total of $300,000. | | SP D. Gullett received a 1-year contract through automatic renewal worth a total of $300,000. | | SP K. Brett received a 1-year contract through automatic renewal worth a total of $300,000. | | Traded a 1st round draft pick and a 2nd round draft pick to the Los Angeles Outlaws, getting 30-year-old shortstop R. Hunt, a 1st round draft pick and a 2nd round draft pick in return. |
| Friday, October 29th, 1971 | | 2B B. Johnson received a 1-year contract through arbitration worth a total of $450,000. | | MR D. Drott received a 1-year contract through arbitration worth a total of $450,000. | | MR J. Ritchie received a 1-year contract through arbitration worth a total of $950,000. |
| Thursday, October 28th, 1971 | | Traded 32-year-old left fielder T. Davis to the Boston Federals, getting a 4th round draft pick in return. | | Released 1B M. Alou. |
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