Performance Shipping has sold yet another boxship, in a move that leaves the former containership specialist with a single such vessel in its fleet.

London-based brokers reported that the New York-listed company — formerly known as Diana Containerships — has sold the 6,494-teu Rotterdam (built 2008) to Greek peer Chartworld for $18.5m.

Performance Shipping confirmed the sale in a press release on Monday, but did not disclose the buyer.