Seaspan Corp has placed millions of stakeholder shares on the proverbial shelf.

The Bing Chen-led owner has registered 38.5 million units held by 13 investors for resale from time to time, according to a prospectus filed with the SEC.

Almost a third — 12 million — of them are owned by Fairfax Financial Holdings. The rest are held by 12 affiliate investors based in the US and overseas.

The shares account for a fraction of Seaspan's 216 million shares outstanding, reflecting $1.83bn in market capitalisation.

Fairfax in January closed the second tranche of its $1bn investment in Seaspan by buying $250m of immediately exercised senior notes and warrants.

Seaspan's fleet consists of 112 boxships.

Its stock gained 2.5% to $8.49 by mid-afternoon.