Fluminense Football Club (Campeonato Brasileiro Serie A): every transfer in and out, fees paid and earned, squad market value, €79m spent and €215m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-01 | Hulk | Atlético-MG | Fluminense | Free |
| 2026-05-08 | João Loiola | Fluminense | NYCFC II | Loan |
| 2026-03-26 | Santiago Moreno | Fluminense | Dallas | Loan |
| 2026-03-06 | Alisson | São Paulo | Fluminense | Loan |
| 2026-03-03 | Rodrigo Castillo | Lanús | Fluminense | €8.6m |
| 2026-03-03 | Julián Millán | Nacional | Fluminense | €4.3m |
| 2026-02-09 | Lima | Fluminense | América | Loan |
| 2026-02-06 | Everaldo | Fluminense | EC Bahia | Loan |
| 2026-01-27 | Wallace Davi | Fluminense | Botafogo | — |
| 2026-01-27 | Keno | Fluminense | Coritiba FC | Loan |
| 2026-01-26 | Matheus Reis | Fluminense U17 | Fluminense | — |
| 2026-01-26 | Felipe Andrade | Fluminense | Houston | €1.7m |
| 2026-01-22 | Jefferson Savarino | Botafogo | Fluminense | €6.4m |
| 2026-01-16 | Gustavo Ramalho | Fluminense Football Club | Pattaya United | Free |
| 2026-01-09 | Thiago Santos | Fluminense | Coritiba FC | — |
| 2026-01-08 | Joaquín Lavega | Fluminense | Coritiba FC | Loan |
| 2026-01-02 | Guilherme Arana | Atlético-MG | Fluminense | €5m |
| 2026-01-01 | Thiago Silva | Fluminense | Porto | Free |
| 2026-01-01 | Nonato | Santos | Fluminense | — |
| 2026-01-01 | Julio Fidelis | Fluminense U20 | Fluminense | — |