Restructuring drillship and rig owner Seadrill has logged a huge loss of $4.66bn for 2020 as tough markets meant more impairments.

The Oslo-listed group, backed by John Fredriksen, made provisions of $2.9bn in the second half, reflecting the view that the downturn is likely to persist for a sustained period and stacked units will not return to work.

Revenue for the second six months was down at $461m against $598m in 2019, while the net loss came in at $2.91bn