A major shareholder of US-listed boxship owner Seaspan has revealed details of a big stock sale.

Companies controlled by the Washington family have registered up to 52.81m shares for sale at a maximum price of $8.98 each, against a closing price of $9.16 last Friday.

This would bring in more than $474m.

The shares are owned by companies including Deep Water Holdings, the Kevin Lee Washington 2014 Trust, the Kyle Roy Washington 2014 Trust and the Kyle Roy Washington 2005 Trust.