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In addition to Halmstads BK, 31 other teams played in SEF Trophy. They were divided into 8 different groups, whereof Halmstads BK could be found in Group 1 together with Karlslunds IF HFK, IFK Göteborg and LB07. Halmstads BK continued to Play off A after reaching 1:st place in Group 1. In the playoff they made it to Semi final, but lost it against BK Häcken with 1-5. In the Final, IF Brommapojkarna won over BK Häcken and became the winner of Play off A in SEF Trophy. Halmstads BK also participated in SEF Trophy during Gothia Cup 2018. They reached the 1/4 Final in SEF Play off B, but lost it against Örgryte IS with 1-3.