Filed Pursuant to Rule 424(b)(7)
No: 333-224288
PROSPECTUS SUPPLEMENT
(To Prospectus Dated May 8,
2018)
1,986,449 Series D Preferred Shares
Seaspan Corporation
This prospectus supplement relates solely to the offer or resale of up to 1,986,449 of our Series D 7.95% Cumulative Redeemable Perpetual
Preferred Shares, or the series D preferred shares, by the selling security-holders identified in this prospectus. These series D preferred shares were issued pursuant to transactions exempt from the registration requirements of the Securities Act
of 1933, as amended, or the Securities Act.
We will not receive any of the proceeds from the sale of these series D preferred shares by
the selling security-holders.
The selling security-holders identified in this prospectus, or their donees, pledgees, transferees or other
successors-in-interest,
may sell the series D preferred shares at various times and in various types of transactions, including sales in the open market, sales in
negotiated transactions and sales by a combination of these methods. The selling security-holders may sell the series D preferred shares to or through underwriters, broker-dealers or agents, who may receive compensation in the form of discounts,
concessions or commissions. For additional information on the methods of sale that may be used by the selling security-holders, please see Plan of Distribution in the prospectus dated May 8, 2018.
Each time a selling security-holder sells securities pursuant to the prospectus dated May 8, 2018, as supplemented by this prospectus
supplement, we will provide an additional prospectus supplement that contains specific information about the offering and the specific terms of the securities offered. You should read the prospectus dated May 8, 2018, this prospectus supplement and
the applicable prospectus supplement carefully before you invest in our securities.
This prospectus supplement should be read in
conjunction with, and may not be delivered or utilized without, the related prospectus dated May 8, 2018.
Our series D preferred shares
trade on The New York Stock Exchange under the symbol SSW PR D. The last reported sale prices of our series D preferred shares on the NYSE on June 12, 2018 was $25.20 per series D preferred share.
You should carefully consider each of the factors described under
Risk Factors
beginning on page 5
of the prospectus dated May 8, 2018 before you make an investment in our securities.
Neither the Securities and Exchange
Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the prospectus dated May 8, 2018 is truthful or complete. Any representation to the contrary is a
criminal offense.
The date of this prospectus supplement is June 13, 2018.