GM: Billy Beane (since 1998)
| Player | Age | Service | G | fWAR | Salary $M | Surplus $M |
|---|---|---|---|---|---|---|
| Jason Giambi | 30 | FA-elig | 154 | 9.2 | 4.1 | +10.8 |
| Mark Mulder | 23 | pre-arb | 34 | 5.7 | 0.2 | +8.9 |
| Eric Chavez | 23 | arb | 151 | 5.5 | 0.6 | +8.3 |
| Tim Hudson | 25 | pre-arb | 36 | 5.0 | 0.5 | +7.5 |
| Barry Zito | 23 | pre-arb | 35 | 4.8 | 0.2 | +7.4 |
| Miguel Tejada | 27 | arb | 162 | 3.7 | 2.0 | +4.0 |
| Frank Menechino | 30 | pre-arb | 139 | 3.2 | 0.2 | +4.9 |
| Ramon Hernandez | 25 | pre-arb | 136 | 2.7 | 0.2 | +4.1 |
| Cory Lidle | 29 | – | 29 | 2.6 | – | – |
| Terrence Long | 25 | pre-arb | 162 | 1.9 | 0.2 | +2.8 |
| Johnny Damon | 27 | FA-elig | 155 | 1.9 | 7.1 | -4.1 |
| Jason Isringhausen | 28 | FA-elig | 65 | 1.8 | 3.3 | -0.4 |
| Jermaine Dye↔ KCR | 27 | arb | 61 | 1.8 | 1.5 | +1.4 |
| Erik Hiljus | 28 | – | 16 | 1.5 | – | – |
| Jim Mecir | 31 | FA-elig | 54 | 1.2 | 1.1 | +0.9 |
| Jeremy Giambi | 26 | arb | 124 | 1.0 | 0.3 | +1.4 |
| Jeff Tam | 30 | arb | 70 | 1.0 | 0.3 | +1.3 |
| Greg Myers↔ BAL | 35 | FA-elig | 33 | 0.6 | 0.7 | +0.2 |
| Chad Bradford | 26 | – | 35 | 0.3 | – | – |
| Mark Guthrie | 35 | FA-elig | 54 | 0.3 | 1.8 | -1.3 |
| F.P. Santangelo | 33 | – | 32 | 0.2 | – | – |
| Eric Byrnes | 25 | – | 19 | 0.2 | – | – |
| Billy McMillon↔ DET | 29 | arb | 20 | 0.2 | 0.1 | +0.1 |
| T.J. Mathews↔ STL | 31 | FA-elig | 20 | 0.2 | 1.3 | -1.0 |
| Mario Valdez | 26 | arb | 32 | 0.1 | 0.2 | -0.0 |
| Mike Fyhrie↔ CHC | 31 | arb | 3 | 0.1 | 0.0 | +0.1 |
| Chad Harville | 24 | pre-arb | 3 | 0.1 | 0.2 | -0.1 |
| Mike Magnante | 36 | FA-elig | 65 | 0.0 | 0.9 | -0.9 |
| Andy Abad | 28 | – | 1 | -0.0 | – | – |
| Ryan Christenson↔ ARI | 27 | arb | 7 | -0.1 | 0.1 | -0.2 |
| Tom Wilson | 30 | – | 9 | -0.1 | – | – |
| Ron Gant↔ COL | 36 | FA-elig | 34 | -0.1 | 0.6 | -0.9 |
| Rob Ryan↔ ARI | 28 | – | 7 | -0.2 | – | – |
| Luis Vizcaino | 26 | – | 36 | -0.2 | – | – |
| Sal Fasano↔ COL | 29 | arb | 11 | -0.3 | 0.1 | -0.6 |
| Olmedo Saenz | 30 | FA-elig | 106 | -0.3 | 0.3 | -0.8 |
| Adam Piatt | 25 | pre-arb | 36 | -0.4 | 0.2 | -0.9 |
| Robin Jennings↔ CIN | 29 | arb | 20 | -0.4 | 0.1 | -0.8 |
| Jose Ortiz↔ COL | 24 | pre-arb | 11 | -0.6 | 0.0 | -1.0 |
| John Jaha | 35 | FA-elig | 12 | -0.6 | 3.2 | -4.3 |
| Gil Heredia | 35 | FA-elig | 24 | -0.7 | 3.3 | -4.4 |
| Mark Bellhorn | 26 | – | 38 | -0.7 | – | – |
42 players appeared (WAR is complete); salary & surplus are on record for 32 of them (76%). Players without a salary show "–" — no single historical salary source is fully complete (especially 2020–2022).
WAR = FanGraphs (fWAR). Green = produced more value than paid (bargain); red = paid more than produced. Service: pre-arb (<3 yr) / arb (3–6) / FA-eligible (6+). Click headers to sort.
| Player | Year | WAR for OAK |
|---|---|---|
| Rickey Henderson | 1989 | 26.8 |
| Mark Ellis | 2001 | 22.1 |
| Dennis Eckersley | 1987 | 19.3 |
| Carney Lansford | 1982 | 16.7 |
| Josh Donaldson | 2008 | 13.8 |
| Jed Lowrie | 2013 | 13.0 |
| Brett Anderson | 2007 | 11.5 |
| Sean Manaea | 2015 | 11.2 |
| Player | Year traded | WAR elsewhere |
|---|---|---|
| Rickey Henderson | 1984 | 26.6 |
| Carlos González | 2008 | 24.7 |
| Andre Ethier | 2005 | 24.4 |
| Gio Gonzalez | 2011 | 20.8 |
| Josh Donaldson | 2014 | 20.4 |
| Mark McGwire | 1997 | 19.7 |
| Aaron Harang | 2003 | 19.3 |
| Jeremy Bonderman | 2002 | 15.8 |