Antiguoko Yth (): every transfer in and out, fees paid and earned, and the market value of the squad.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2017-07-01 | Julen Agirrezabala | Antiguoko Yth | Antiguoko U19 | — |
| 2016-07-01 | Jesús Owono | Real Sociedad Y | Antiguoko Yth | Loan |
| 2015-07-01 | Peru Nolaskoain | Antiguoko Yth | Bilbao U19 | Free |
| 2013-07-01 | Jesús Owono | Antiguoko Yth | Real Sociedad Y | Free |
| 2011-07-01 | Martín Zubimendi | Antiguoko Yth | Real Sociedad Y | Free |
| 2010-07-01 | Unai López | Antiguoko Yth | Real Sociedad Y | — |