(Bloomberg) -- Atlas Corp., the holding company that controls shipping firm Seaspan, said it received an offer from a shareholder group that includes former Berkshire Hathaway Inc. executive David Sokol and Canadian investment group Fairfax Financial Holdings Ltd. 

The cash bid of $14.45 a share values Atlas at about $3.6 billion. It’s a 25% premium to Thursday’s closing price, but it’s also below where the shares traded as recently as April. 

Atlas rose 24% to $14.34 as of 9:42 a.m. in New York. Fairfax was down 0.3% in Toronto. 

Toronto-based Fairfax is already the largest shareholder of Atlas with just under 50%, according to data compiled by Bloomberg. The bidding group also includes affiliates of the Washington family, which owns 19% of Atlas, and Sokol, who is the company’s chairman.

The non-binding offer is conditional on approval by a committee of independent directors and by holders of a majority of the shares not owned by the buying group, Atlas said in a statement released after the market closed in New York on Thursday. 

Seaspan is the world’s largest independent owner and operator of container ships, with a fleet of 134 ships as of the end of last year. It’s Atlas’s major asset, producing about 88% of its adjusted earnings before interest, taxes, depreciation and amortization, according to a company presentation in March. Atlas also owns APR Energy, which leases mobile power units including gas and diesel generators. 

(Updates with share price in third paragraph)

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