The Oslo-listed company said it had bought 250,000 shares on 27 June at an average price of NOK 64 each.
The stock was trading down 0.4% at NOK 63.75 on Monday morning.
The first deal represents 0.84% of its equity. The shares will be held as treasury stock.
The company has also launched a share buyback worth up to $10m, running to the end of the year.
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