| Tuesday, December 11th , 1956 |
| Boston Minutemen: RP Johnny Whitter was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Boston Minutemen: RP Gene Smith was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Boston Minutemen: C Tillie Juarez was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Boston Minutemen: 1B Sam Hannah was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| St. Louis Pioneers: LF Delos Davis was added to the secondary (40-man) roster. |
| Boston Minutemen: CF Joe Burns was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| St. Louis Pioneers: CF Bill Grace was added to the secondary (40-man) roster. |
| Boston Minutemen: RP Carl Potter was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Chicago Cougars: 2B Jack B Gibson was added to the secondary (40-man) roster. |
| Chicago Cougars: 2B Dave Rathbone was added to the secondary (40-man) roster. |
| Chicago Cougars: C Ed Blevins was added to the secondary (40-man) roster. |
| Chicago Cougars: C Stan Czerwinski was added to the secondary (40-man) roster. |
| Chicago Cougars: SP Hank Walker was added to the secondary (40-man) roster. |
| Chicago Cougars: LF Charlie Harvey was added to the secondary (40-man) roster. |
| Chicago Cougars: Released 1B Lou Kimball. |
| Philadelphia Keystones: SP Mike Fresh was added to the secondary (40-man) roster. |
| Philadelphia Keystones: SP Jim Cooper was added to the secondary (40-man) roster. |
| Philadelphia Keystones: SS Roxy Schilling was added to the secondary (40-man) roster. |
| Philadelphia Keystones: C Artie Smith was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Philadelphia Keystones: SP Bob Howell was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Philadelphia Keystones: CL Ted Beaven was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| San Francisco Sailors: CF Dave Oliver was added to the secondary (40-man) roster. |
| San Francisco Sailors: 3B William Merriman was added to the secondary (40-man) roster. |
| Cincinnati Cannons: LF Dick Clem was added to the secondary (40-man) roster. |
| Cincinnati Cannons: C Art McKinney was added to the secondary (40-man) roster. |
| Cincinnati Cannons: LF Bill Wall was added to the secondary (40-man) roster. |
| Pittsburgh Miners: SP Gil Woodruff was added to the secondary (40-man) roster. |
| Pittsburgh Miners: SP Bill Davis was added to the secondary (40-man) roster. |
| Washington Eagles: 1B Mike Stehle was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Washington Eagles: RF Ron Thacker was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Washington Eagles: RP George Blake was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Washington Eagles: RP Frank Porter was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Detroit Dynamos: 1B Danny Murphy was added to the secondary (40-man) roster. |
| Detroit Dynamos: LF Bill Swindler was added to the secondary (40-man) roster. |
| New York Gothams: SP Ted Kukulski was added to the secondary (40-man) roster. |
| New York Gothams: 1B Ed Hill was added to the secondary (40-man) roster. |
| New York Gothams: 1B Harry Arthur was added to the secondary (40-man) roster. |
| Los Angeles Stars: C Clyde Scott was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Los Angeles Stars: LF Bucky Moore was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Los Angeles Stars: RP Stan Brueck was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Los Angeles Stars: 2B Les Miller was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Los Angeles Stars: RP Ed Power was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Cleveland Foresters: LF Dizzy Franz was added to the secondary (40-man) roster. |
| Cleveland Foresters: SP Earle Turner was added to the secondary (40-man) roster. |
| Cleveland Foresters: C Billy Hogan was added to the secondary (40-man) roster. |
| Cleveland Foresters: CF Joe Sutton was added to the secondary (40-man) roster. |
| Kansas City Kings: LF Bob Craig was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Kansas City Kings: RP Mule Crawford was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Kansas City Kings: RP Alex Hafer was designated for assignment, placed on waivers and taken off the secondary (40-man) roster. |
| Chicago Cougars: Signed free agent RP Jim Burke to a minor league contract. |
| The San Francisco Sailors traded 31-year old 1B Cliff Dilley to the New York Gothams, getting 20-year old minor league LHP Paul Gleason and 20-year old minor league RF Lew Robinson in return. |
| Los Angeles Stars: RP Vince Gilman was designated for assignment and placed on waivers. |
| Montreal Saints: Lost 2B Phil Belleau in the Rule 5 Draft to the Los Angeles Stars. |
| Los Angeles Stars: Drafted 2B Phil Belleau in the 1956 Rule 5 Draft (Round 1, Pick 1, 1st overall Pick) from the Montreal Saints. |
| Toronto Wolves: Lost 3B Carl Matthews in the Rule 5 Draft to the St. Louis Pioneers. |
| St. Louis Pioneers: Drafted 3B Carl Matthews in the 1956 Rule 5 Draft (Round 1, Pick 2, 2nd overall Pick) from the Toronto Wolves. |
| Detroit Dynamos: Lost RP Joe Quade in the Rule 5 Draft to the Pittsburgh Miners. |
| Pittsburgh Miners: Drafted SP Joe Quade in the 1956 Rule 5 Draft (Round 1, Pick 3, 3rd overall Pick) from the Detroit Dynamos. |
| Cincinnati Cannons: Lost CF Ben Crawford in the Rule 5 Draft to the San Francisco Sailors. |
| San Francisco Sailors: Drafted CF Ben Crawford in the 1956 Rule 5 Draft (Round 1, Pick 9, 9th overall Pick) from the Cincinnati Cannons. |
