Oslo-listed tanker owner TIL said a fund managed by BlueMountain Capital Management had bought 207,311 shares after trading closed on 12 September.
This would have cost NOK 13.37m ($2.1m) at Monday’s price of NOK 64.50 each.
Funds linked to BlueMountain now have 5.37m shares in TIL, or 13.98%.
It trails only Goldman Sachs, with 16.76%.