Analysts are tipping a big boost to New York-listed Atlas Corp's profit in the coming years after a huge expansion of its containership fleet.

The tonnage provider said in its first-quarter results that fleet growth hit a record 27%, with subsidiary Seaspan Corp adding 36 vessels, including 32 newbuildings, at a cost of $4.6bn.

Contracted revenue hit $12bn, with half of this added in 2021 alone, through long-term charter deals averaging 11 years.