Born Mar 27, 1987 · Leesburg, GA · age 39
A franchise-icon catcher and three-time World Series champion who moved directly into the front office as the San Francisco Giants' head of baseball operations.
2 seasons with salary-era data across 1 stint. All figures are franchise-level outcomes during the tenure, not solely attributable to one executive.
| Team | Role | Years | Szns | WAB | WAB/yr | TAB | WAR surp | HG | Trade | FA | R5 | AcqLev | W-L% | PO | Pen | WS | Surp $M |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ▸ Giants | POBO | 2025–present | 1 | -0.7 | -0.69 | -1.8 | -20.4 | +0.2 | +2.2 | +6.0 | +0.0 | 0.53 | 0.475 | – | – | – | -120 |
| Career total (1985+ data) | 2 | -0.7 | -1.8 | -20.4 | +0.2 | +2.2 | +6.0 | +0.0 | 0.53 | 0.475 | – | – | – | -120 | |||
Acquired minus surrendered / signed minus walked.
Every roster slot ranked best→worst by WAR, averaged across Buster Posey's seasons. Bars = his rosters; the black line = the league-average player at each slot. Staying above the line deep into the roster is the depth edge.
| Player | Pos | Team | How | Year | Szns | fWAR | WAR/yr | Lev |
|---|---|---|---|---|---|---|---|---|
| Willy Adames | SS | SFG | Trade | 2025 | 2 | +4.3 | +2.1 | 2.9 |
| Luis Arráez | 1B/2B | SFG | Free agency | 2026 | 1 | +3.6 | +3.6 | 1.5 |
| Justin Verlander | P | SFG | Free agency | 2025 | 1 | +2.2 | +2.2 | 1.7 |
| Rafael Devers | 3B | SFG | Trade | 2025 | 2 | +1.2 | +0.6 | 1.0 |
| Tyler Mahle | P | SFG | Free agency | 2026 | 1 | +0.7 | +0.7 | 0.3 |
| Daniel Susac | C | SFG | Trade | 2025 | 1 | +0.7 | +0.7 | – |
| Bryce Eldridge | 1B/DH | SFG | Draft | 2025 | 1 | +0.6 | +0.6 | – |
| Dominic Smith | 1B/OF | SFG | Free agency | 2025 | 1 | +0.4 | +0.4 | 0.3 |
| Drew Gilbert | OF | SFG | Trade | 2025 | 2 | +0.2 | +0.1 | – |
| Sam Hentges | P | SFG | Free agency | 2025 | 1 | +0.2 | +0.2 | 0.1 |
| Caleb Kilian | P | SFG | Free agency | 2025 | 1 | +0.2 | +0.2 | 0.1 |
| Andrew Knizner | C | SFG | Trade | 2025 | 1 | +0.2 | +0.2 | 0.2 |
| JT Brubaker | P | SFG | Free agency | 2025 | 2 | +0.1 | +0.0 | 0.3 |
| Joey Lucchesi | P | SFG | Free agency | 2025 | 1 | +0.1 | +0.1 | 0.0 |
| Blade Tidwell | P | SFG | Trade | 2026 | 1 | +0.1 | +0.1 | 0.1 |
| Jason Foley | P | SFG | Free agency | 2025 | 1 | +0.0 | +0.0 | 0.0 |
| Adrian Houser | P | SFG | Free agency | 2025 | – | -0.0 | – | – |
| Buddy Kennedy | 2B/3B | SFG | Free agency | 2025 | – | -0.0 | – | – |
| Joel Peguero | P | SFG | Rule 5 | 2025 | 2 | +0.0 | +0.0 | – |
| Dylan Smith | P | SFG | Trade | 2026 | 1 | +0.0 | +0.0 | 0.0 |
| Ryan Borucki | P | SFG | Free agency | 2026 | – | -0.1 | – | – |
| Jared Oliva | OF | SFG | Free agency | 2026 | – | -0.1 | – | – |
| José Buttó | P | SFG | Trade | 2025 | – | -0.2 | – | – |
| Eric Haase | C | SFG | Free agency | 2026 | – | -0.2 | – | – |
| Harrison Bader | OF | SFG | Free agency | 2026 | – | -0.4 | – | – |
| Will Brennan | OF | SFG | Free agency | 2026 | – | -0.4 | – | – |
| Carson Whisenhunt | P | SFG | Draft | 2025 | 1 | -0.4 | -0.4 | – |
| Jerar Encarnacion | OF | SFG | Trade | 2025 | 1 | -0.5 | -0.5 | 0.1 |
| Matt Gage | P | SFG | Free agency | 2025 | 1 | -0.8 | -0.8 | 0.4 |
WAB = wins above what the team's payroll predicted (resource-controlled). WAR surplus = era-neutral value (WAR minus payroll in win-equivalents). Roster surplus $M = dollar value of WAR over cost. Build channels (realized fWAR): HG = home-grown via amateur draft / international signing; Trade = acquired minus surrendered (incl. purchases/waivers); FA = signed minus walked; R5 = Rule-5 / minor-league-draft pickups. Credit follows the acquisition year — home-grown to the regime at the player's draft/signing (not whoever was in the chair when he peaked), trade/FA/R5 to the GM who made the move. Players acquired as prospects before debuting (e.g. Smoltz, Bagwell; Rule-5 picks like Uggla) are counted as trade/R5, not home-grown. All are franchise-level outcomes during the stint, not solely attributable to one executive.