The shares, worth a nominal value of ISK 88.4 million (€1.1 million/$1.3 million), were acquired in the wake of the merger of Sjovik/Blue Ice Group and Icelandic.
SIF previously held around 13 percent in Sjovik.
SIF Group estimated a €5.5 million ($6.6 million) capital gain from the sale, which will be recorded in the second quarter that ends June 30.