In addition to Holmlia SK, 86 other teams from 5 different countries played in Boys 15 - born 2003- 11 aside . They were divided into 21 different groups, whereof Holmlia SK could be found in Group 12 together with Urædd FK, HSV Fotball 2, Riska FK and Loddefjord IL.

Holmlia SK continued to Playoff B after reaching 4:th place in Group 12. In the playoff they made it to 1/16 Final, but lost it against Eikelandsfjorden IL with 3-4. In the Final, Tertnes Fotball Herrer 1 won over Haugerud IF and became the winner of Playoff B in Boys 15 - born 2003- 11 aside .

Holmlia SK also participated in C - Boys 11-aside, 14 years during Norway Cup 2017. They reached the 1/32 Final in C Playoff B, but lost it against Ellingsrud IL with 1-4.