1.FSV Mainz 05 (Bundesliga): every transfer in and out, fees paid and earned, squad market value, €171m spent and €296m earned. Tracked squad: ACTUAL Value €73m vs €152m market value. Valued as of 2026-08-26.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-30 | Alexander Schwolow | Hearts | 1.FSV Mainz 05 | Free |
| 2026-07-17 | Nelson Weiper | 1.FSV Mainz 05 | Sportklub Puntigamer Sturm Graz | Loan |
| 2026-07-16 | Ben Bobzien | 1.FSV Mainz 05 | Dynamo Dresden | €1m |
| 2026-07-16 | Niklas Tauer | 1.FSV Mainz 05 | TSV Havelse | Free |
| 2026-07-06 | Lasse Rieß | 1.FSV Mainz 05 | Fortuna Düsseldorf | Loan |
| 2026-07-01 | Eric Martel | 1.FC Köln | Mainz | Free |
| 2026-07-01 | Ransford Königsdörffer | Hamburg | Mainz | Free |
| 2026-07-01 | Sheraldo Becker | CA Osasuna | Mainz | €500k |
| 2026-07-01 | Sota Kawasaki | Kyoto Sanga | Mainz | €1m |
| 2026-07-01 | Nick Cherny | Borussia Dortmund | 1.FSV Mainz 05 | Free |
| 2026-07-01 | Fabio Gruber | 1. FC Nürnberg | 1.FSV Mainz 05 | €3.5m |
| 2026-07-01 | Daniel Batz | Mainz | Mönchengladbach | Free |
| 2026-07-01 | Kasey Bos | Mainz | Excelsior | Loan |
| 2026-07-01 | Nikolas Veratschnig | Mainz | Salzburg | €3.5m |
| 2026-07-01 | Tom Krauß | Mainz | 1.FC Köln | €3.5m |
| 2026-07-01 | T. Müller | 1.FSV Mainz 05 | TSG 1899 Hoffenheim | Free |
| 2026-07-01 | J. Amann | 1.FSV Mainz 05 | Viktoria Köln | Free |
| 2026-07-01 | Daniel Gleiber | 1.FSV Mainz 05 | Saarbrücken | Loan |
| 2026-07-01 | Arnaud Nordin | 1.FSV Mainz 05 | Rennes Jugend | €2.2m |
| 2026-02-03 | Otto Ruoppi | 1.FSV Mainz 05 | KuPS | Loan |