GM: Billy Beane (since 1998)
| Player | Age | Service | G | fWAR | Salary $M | Surplus $M |
|---|---|---|---|---|---|---|
| Eric Chavez | 24 | arb | 153 | 5.7 | 2.1 | +7.6 |
| Tim Hudson | 26 | arb | 34 | 4.8 | 0.9 | +7.3 |
| Miguel Tejada | 28 | arb | 162 | 4.5 | 3.6 | +4.1 |
| Barry Zito | 24 | pre-arb | 35 | 4.5 | 0.3 | +7.3 |
| Mark Mulder | 24 | pre-arb | 30 | 3.8 | 0.8 | +5.8 |
| Cory Lidle | 30 | arb | 31 | 3.7 | 2.5 | +3.8 |
| Scott Hatteberg | 32 | FA-elig | 136 | 3.2 | 0.9 | +4.6 |
| Mark Ellis | 25 | – | 98 | 2.7 | – | – |
| Chad Bradford | 27 | arb | 75 | 2.0 | 0.2 | +3.2 |
| Ramon Hernandez | 26 | arb | 136 | 1.9 | 0.5 | +2.7 |
| John Mabry↔ PHI | 31 | FA-elig | 89 | 1.6 | 0.4 | +2.3 |
| Billy Koch | 27 | arb | 84 | 1.3 | 2.4 | -0.1 |
| Ray Durham↔ CHW | 30 | FA-elig | 54 | 1.3 | 2.3 | -0.1 |
| Aaron Harang | 24 | – | 16 | 1.1 | – | – |
| Greg Myers | 36 | FA-elig | 65 | 0.8 | 0.8 | +0.6 |
| Ricardo Rincon↔ CLE | 32 | arb | 25 | 0.8 | 0.5 | +0.8 |
| Jim Mecir | 32 | FA-elig | 61 | 0.7 | 2.4 | -1.1 |
| Olmedo Saenz | 31 | FA-elig | 68 | 0.7 | 0.8 | +0.4 |
| Mike Fyhrie | 32 | – | 16 | 0.7 | – | – |
| Terrence Long | 26 | arb | 162 | 0.6 | 0.7 | +0.3 |
| David Justice | 36 | FA-elig | 118 | 0.6 | 7.0 | -6.0 |
| Frank Menechino | 31 | arb | 38 | 0.5 | 0.3 | +0.5 |
| Adam Piatt | 26 | – | 55 | 0.3 | – | – |
| Jeremy Giambi↔ PHI | 27 | arb | 42 | 0.2 | 0.4 | +0.0 |
| Jermaine Dye | 28 | FA-elig | 131 | 0.2 | 7.2 | -6.8 |
| Jeff Tam | 31 | arb | 40 | 0.2 | 0.7 | -0.4 |
| Jason Grabowski | 26 | – | 4 | 0.2 | – | – |
| Ted Lilly↔ NYY | 26 | arb | 6 | 0.1 | 0.1 | +0.2 |
| Mike Magnante | 37 | FA-elig | 32 | 0.1 | 1.2 | -1.1 |
| Cody McKay | 28 | – | 2 | 0.1 | – | – |
| Eric Byrnes | 26 | – | 90 | 0.0 | – | – |
| Carlos Pena↔ DET | 24 | pre-arb | 40 | 0.0 | 0.1 | +0.0 |
| Micah Bowie | 27 | – | 13 | 0.0 | – | – |
| Randy Velarde | 39 | FA-elig | 56 | -0.0 | 1.0 | -1.0 |
| Jose Flores | 29 | – | 7 | -0.0 | – | – |
| Larry Sutton | 32 | – | 7 | -0.1 | – | – |
| Erik Hiljus | 29 | arb | 9 | -0.2 | 0.2 | -0.6 |
| Mike Colangelo | 25 | arb | 20 | -0.3 | 0.3 | -0.8 |
| Mike Venafro | 28 | arb | 47 | -0.3 | 0.8 | -1.3 |
| Mike Holtz↔ SDP | 29 | FA-elig | 16 | -0.3 | 0.3 | -0.8 |
| Esteban German | 24 | – | 9 | -0.3 | – | – |
41 players appeared (WAR is complete); salary & surplus are on record for 30 of them (73%). 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 |