 
| Roles | Competed in Olympic Games | 
|---|---|
| Sex | Male | 
| Full name | Matias•Koski | 
| Used name | Matias•Koski | 
| Born | 18 May 1994 in Hämeenlinna, Kanta-Häme (FIN) | 
| Measurements | 195 cm / 93 kg | 
| Affiliations | University of Georgia / Dynamo Swim Club, United States / Heinolan Isku | 
| NOC |  Finland | 
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 2012 Summer Olympics | Swimming (Aquatics) |  FIN | Matias Koski | |||
| 200 metres Freestyle, Men (Olympic) | 31 | |||||
| 400 metres Freestyle, Men (Olympic) | 22 | |||||
| 1,500 metres Freestyle, Men (Olympic) | 27 | |||||
| 2016 Summer Olympics | Swimming (Aquatics) |  FIN | Matias Koski | |||
| 200 metres Freestyle, Men (Olympic) | 21 | |||||
| 400 metres Freestyle, Men (Olympic) | 42 |