Rosternomics
BP

Buster Posey

★ active

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.

Titles0
Pennants0
Playoffs0
Record104–119
Win %0.466
+0.6WAB — wins above budget67th/195 execs
-0.6Talent above budget — roster-construction alpha (talent your budget bought above expectation)83rd/195 execs
0.82Acquisition leverage — playoff pts each bought win added, given the roster it joined (did you buy where wins matter?)109th/195 execs
-14.9WAR surplus (era-neutral, win-equiv)70th/195 execs
-118Roster surplus $M135th/195 execs

How the roster was sourced

Share of gross-positive acquired fWAR by channel (vs. league average).

Build channels — net fWAR

Acquired minus surrendered / signed minus walked.

Home-grown (draft/intl)-0.4
Trade+0.6
Free agency+3.7
Rule 5 / minor draft+0.0
Sourcing mix: 0% draft · 85% FA · 14% trade · 1% R5

Tenure breakdown

TeamRoleYearsSzns WAB WAB/yr TAB WAR surp HG Trade FA R5 AcqLev W-L% POPenWS Surp $M
Giants POBO 2025–present 1 +0.6 +0.63 -0.6 -14.9 -0.4 +0.6 +3.7 +0.0 0.82 0.466 -118
Career total (1985+ data) 2 +0.6 -0.6 -14.9 -0.4 +0.6 +3.7 +0.0 0.82 0.466 -118

Players acquired — 24 players, by realized fWAR for the franchise (scroll for more)

PlayerPosTeam How Year fWAR
Luis Arráez 1B/2B SFG Free agency 2026 +2.4
Justin Verlander P SFG Free agency 2025 +2.2
Daniel Susac C SFG Trade 2025 +0.8
Eric Haase C SFG Free agency 2026 +0.5
Dominic Smith 1B/OF SFG Free agency 2025 +0.4
JT Brubaker P SFG Free agency 2025 +0.1
Drew Gilbert OF SFG Trade 2025 +0.1
Joey Lucchesi P SFG Free agency 2025 +0.1
Tyler Mahle P SFG Free agency 2026 +0.1
Rafael Devers 3B SFG Trade 2025 +0.0
Bryce Eldridge 1B/DH SFG Draft 2025 +0.0
Sam Hentges P SFG Free agency 2025 -0.0
Joel Peguero P SFG Rule 5 2025 +0.0
Dylan Smith P SFG Trade 2026 -0.0
Ryan Borucki P SFG Free agency 2026 -0.1
Adrian Houser P SFG Free agency 2025 -0.1
Buddy Kennedy 2B/3B SFG Free agency 2025 -0.1
Jared Oliva OF SFG Free agency 2026 -0.1
José Buttó P SFG Trade 2025 -0.2
Matt Gage P SFG Free agency 2025 -0.3
Harrison Bader OF SFG Free agency 2026 -0.4
Will Brennan OF SFG Free agency 2026 -0.4
Caleb Kilian P SFG Free agency 2025 -0.4
Carson Whisenhunt P SFG Draft 2025 -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.