1978-12-05 | Darrell Evans | Signed as Free Agent by Giants. | 3B-1B | 6-2 | 205 | L | R | 1947-05-26 | Pasadena,CA | 1967- 7- 132-KC1
| MLB | 1969-1989 | 1967-1989 |
1978-12-04 | Max Venable | Selected by Giants from Dodgers in Rule 5 major league draft | OF-DH | 5-10 | 185 | L | R | 1957-06-06 | Phoenix,AZ | 1976- 3- 67-LAN
| MLB | 1979-1991 | 1977-1991 |
1978-07-24 | Rob Dressler | Traded by Giants to Cardinals for John Tamargo. | P | 6-3 | 180 | R | R | 1954-02-02 | Portland,OR | 1972- 1- 19-SFN
| MLB | 1975-1980 | 1972-1980 |
1978-07-18 | John Tamargo | Traded by Cardinals to Giants for Rob Dressler. | C-3B | 5-10 | 180 | B | R | 1951-11-07 | Tampa,FL | 1973- 6- 132-SLN
| MLB | 1976-1980 | 1973-1981 |
1978-06-15 | Roger Metzger | Purchased by Giants from Astros. | SS-2B | 6-0 | 165 | B | R | 1947-10-10 | Fredericksburg,TX | 1969- 1- 16-CHN
| MLB | 1970-1980 | 1969-1980 |
1978-06-15 | Jim Dwyer | Traded by Cardinals to Giants for Frank Riccelli. | OF-DH | 5-10 | 175 | L | L | 1950-01-03 | Evergreen Park,IL | 1971- 11- 255-SLN
| MLB | 1973-1990 | 1971-1990 |
1978-06-15 | Hector Cruz | Traded by Cubs to Giants for Lynn McGlothen. | OF-3B | 5-11 | 170 | R | R | 1953-04-02 | Arroyo,PR | 1970- 0- 0-SLN
| MLB | 1973-1982 | 1970-1982 |
1978-06-15 | Lynn McGlothen | Traded by Giants to Cubs for Hector Cruz. | P | 6-2 | 195 | L | R | 1950-03-27 | Monroe,LA | 1968- 3- 60-BOS
| MLB | 1972-1982 | 1968-1982 |
1978-04-07 | Mario Guerrero | Traded by Giants with Phil Huffman, John Henry Johnson, Alan Wirth, Dave Heaverlo, Gary Thomasson, Gary Alexander and Cash to Athletics for Vida Blue. | SS-2B | 5-10 | 155 | R | R | 1949-09-28 | Santo Domingo,DR | 1968- 0- 0-NYA
| MLB | 1973-1980 | 1968-1980 |
1978-04-03 | Tommy Toms | Purchased by Cardinals from Giants. | P-OF | 6-4 | 195 | R | R | 1951-10-15 | Charlottesville,VA | 1973- 6- 126-SFN
| MLB | 1975-1977 | 1975-1978 |
1978-03-27 | Randy Elliott | Released by Giants. | OF-DH | 6-2 | 190 | R | R | 1951-06-05 | Oxnard,CA | 1969- 1- 24-SDN
| MLB | 1972-1980 | 1969-1980 |
1978-03-21 | Al Hargesheimer | Signed as undrafted amateur Free Agent by Giants. | P-OF | 6-3 | 195 | R | R | 1956-11-21 | Chicago,IL | 1978- 0- 0-SFN
| MLB | 1980-1986 | 1978-1988 |
1978-03-15 | Vida Blue | Traded by Athletics to Giants for Mario Guerrero, Phil Huffman, John Henry Johnson, Alan Wirth, Dave Heaverlo, Gary Thomasson, Gary Alexander and Cash. | P | 6-0 | 189 | B | L | 1949-07-28 | Mansfield,LA | 1967- 2- 27-KC1
| MLB | 1969-1986 | 1968-1986 |
1978-03-15 | Phil Huffman | Traded by Giants with Mario Guerrero, John Henry Johnson, Alan Wirth, Dave Heaverlo, Gary Thomasson, Gary Alexander and Cash to Athletics for Vida Blue. | P | 6-2 | 180 | R | R | 1958-06-20 | Freeport,TX | 1977- 2- 36-SFN
| MLB | 1979-1985 | 1977-1987 |
1978-03-15 | John Henry Johnson | Traded by Giants with Mario Guerrero, Phil Huffman, Alan Wirth, Dave Heaverlo, Gary Thomasson, Gary Alexander and Cash to Athletics for Vida Blue. | P | 6-2 | 190 | L | L | 1956-08-21 | Houston,TX | 1974- 15- 355-SFN
| MLB | 1978-1987 | 1974-1987 |
1978-03-15 | Gary Thomasson | Traded by Giants with Mario Guerrero, Phil Huffman, John Henry Johnson, Alan Wirth, Dave Heaverlo, Gary Alexander and Cash to Athletics for Vida Blue. | OF-1B | 6-1 | 180 | L | L | 1951-07-29 | San Diego,CA | 1969- 7- 162-SFN
| MLB | 1972-1980 | 1969-1980 |
1978-03-15 | Gary Alexander | Traded by Giants with Mario Guerrero, Phil Huffman, John Henry Johnson, Alan Wirth, Dave Heaverlo, Gary Thomasson and Cash to Athletics for Vida Blue. | C-DH | 6-2 | 200 | R | R | 1953-03-27 | Los Angeles,CA | 1972- 2- 36-SFN
| MLB | 1975-1981 | 1972-1981 |
1978-03-15 | Dave Heaverlo | Traded by Giants with Mario Guerrero, Phil Huffman, John Henry Johnson, Alan Wirth, Gary Thomasson, Gary Alexander and Cash to Athletics for Vida Blue. | P | 6-1 | 210 | R | R | 1950-08-25 | Ellensburg,WA | 1973- 1- 23-SFN
| MLB | 1975-1981 | 1973-1983 |
1978-03-15 | Alan Wirth | Traded by Giants with Mario Guerrero, Phil Huffman, John Henry Johnson, Dave Heaverlo, Gary Thomasson, Gary Alexander and Cash to Athletics for Vida Blue. | P | 6-4 | 190 | R | R | 1956-12-08 | Mesa,AZ | 1974- 3- 67-SFN
| MLB | 1978-1980 | 1974-1982 |
1978-02-28 | Derrel Thomas | Traded by Giants to Padres for Mike Ivie. | 2B-OF | 6-0 | 160 | B | R | 1951-01-14 | Los Angeles,CA | 1969- 1- 1-HOU
| MLB | 1971-1985 | 1969-1985 |
1978-02-28 | Mike Ivie | Traded by Padres to Giants for Derrell Thomas. | 1B-3B | 6-3 | 205 | R | R | 1952-08-08 | Atlanta,GA | 1970- 1- 1-SDN
| MLB | 1971-1983 | 1970-1983 |