| 05 Oct 20 | D. Klaassen Davy Klaassen |  Werder BremenWER | → |  Ajax AmsterdamAJA | 11000000 |
| 05 Oct 20 | N. Lang Noa Lang | Ajax AmsterdamAJA | → |  Club BruggeBRUG | Loan |
| 05 Oct 20 | D. Klaassen Davy Klaassen | Werder BremenWER | → | Ajax AmsterdamAJA | 11000000 |
| 01 Oct 20 | S. Klaiber Sean Klaiber |  FC UtrechtUTR | → | Ajax AmsterdamAJA | Undisclosed |
| 01 Oct 20 | S. Dest Sergiño Dest | Ajax AmsterdamAJA | → |  BarcelonaBAR | Undisclosed |
| 01 Oct 20 | S. Dest Sergiño Dest | Ajax AmsterdamAJA | → | BarcelonaBAR | Undisclosed |
| 19 Sept 20 | C. Eiting Carel Eiting | Ajax AmsterdamAJA | → |  Huddersfield TownHUD | Loan |
| 19 Sept 20 | C. Eiting Carel Eiting | Ajax AmsterdamAJA | → | Huddersfield TownHUD | Loan |
| 03 Sept 20 | L. Magallán Lisandro Magallán | Ajax AmsterdamAJA | → |  CrotoneCRO | Loan |
| 03 Sept 20 | L. Magallán Lisandro Magallán | Ajax AmsterdamAJA | → | CrotoneCRO | Loan |
| 02 Sept 20 | D. van de Beek Donny van de Beek | Ajax AmsterdamAJA | → |  Manchester UnitedMAN | Undisclosed |
| 02 Sept 20 | D. van de Beek Donny van de Beek | Ajax AmsterdamAJA | → | Manchester UnitedMAN | Undisclosed |
| 01 Sept 20 | R. Marin Razvan Marin | Ajax AmsterdamAJA | → |  CagliariCAG | Loan |
| 01 Sept 20 | R. Marin Razvan Marin | Ajax AmsterdamAJA | → | CagliariCAG | Loan |
| 19 Aug 20 | Danilo | Ajax AmsterdamAJA | → |  FC TwenteTWE | Loan |
| 31 Jul 20 | S. Botman Sven Botman | Ajax AmsterdamAJA | → |  LilleLILL | Undisclosed |
| 31 Jul 20 | S. Botman Sven Botman | Ajax AmsterdamAJA | → | LilleLILL | Undisclosed |
| 29 Jul 20 | J. Veltman Joël Veltman | Ajax AmsterdamAJA | → |  Brighton & Hove AlbionBHA | Undisclosed |
| 29 Jul 20 | J. Veltman Joël Veltman | Ajax AmsterdamAJA | → | Brighton & Hove AlbionBHA | Undisclosed |
| 16 Jul 20 | M. Kudus Mohammed Kudus |  FC NordsjaellandNORD | → | Ajax AmsterdamAJA | Undisclosed |
| 16 Jul 20 | K. Pierie Kik Pierie | Ajax AmsterdamAJA | → | FC TwenteTWE | Loan |
| 01 Jul 20 | H. Ziyech Hakim Ziyech | Ajax AmsterdamAJA | → |  ChelseaCHE | 44000000 |
| 01 Jul 20 | M. Stekelenburg Maarten Stekelenburg |  EvertonEVE | → | Ajax AmsterdamAJA | Free |
| 01 Jul 20 | H. Ziyech Hakim Ziyech | Ajax AmsterdamAJA | → | ChelseaCHE | 44000000 |
| 01 Jul 20 | Antony |  São PauloSAO | → | Ajax AmsterdamAJA | 15750000 |
| 01 Jul 20 | M. Stekelenburg Maarten Stekelenburg | EvertonEVE | → | Ajax AmsterdamAJA | Free |
| 01 Jul 20 | Antony | São PauloSAO | → | Ajax AmsterdamAJA | 15750000 |
| 20 Feb 20 | S. de Jong Siem de Jong | Ajax AmsterdamAJA | → |  FC CincinnatiCIN | Free |
| 20 Feb 20 | S. de Jong Siem de Jong | Ajax AmsterdamAJA | → | FC CincinnatiCIN | Free |
| 31 Jan 20 | K. Sierhuis Kaj Sierhuis | Ajax AmsterdamAJA | → |  Stade de ReimsREIM | Loan |
| 31 Jan 20 | K. Sierhuis Kaj Sierhuis | Ajax AmsterdamAJA | → | Stade de ReimsREIM | Loan |
| 27 Jan 20 | H. Bandé Hassane Bandé | Ajax AmsterdamAJA | → |  FC ThunTHUN | Loan |
| 22 Jan 20 | N. Kühn Nicolas Gerrit Kühn | Ajax AmsterdamAJA | → |  Bayern MunichMUN | Loan |
| 22 Jan 20 | N. Kühn Nicolas Gerrit Kühn | Ajax AmsterdamAJA | → | Bayern MunichMUN | Loan |
| 18 Jan 20 | N. Lang Noa Lang | Ajax AmsterdamAJA | → | FC TwenteTWE | Loan |
| 11 Jan 20 | L. Orejuela Luis Orejuela | Ajax AmsterdamAJA | → |  CruzeiroCRU | Undisclosed |
| 11 Jan 20 | R. Babel Ryan Babel |  GalatasarayGAL | → | Ajax AmsterdamAJA | Loan |
| 11 Jan 20 | L. Orejuela Luis Orejuela | Ajax AmsterdamAJA | → | CruzeiroCRU | Undisclosed |