Global Ship Lease (GSL) and company insiders have spent $58m in shares of the New York-listed owner as charter revenue becomes plentiful in a searing hot boxship sector.

The Ian Webber-led owner of 61 containerships has purchased 521,260 common shares from major shareholder Kelso & Co at $19.17 each, a 5% discount to Tuesday's closing price on the New York Stock Exchange.