US-listed Navios Maritime Partners unveiled an order for up to six mid-size containerships on Tuesday, as it reported record profitability on the back of a booming market in the box sector.

The Angeliki Frangou-led company, which is a spin-off of Navios Maritime Holdings, said it agreed earlier this month to spend $246.4m on four 5,300-teu vessels due to be delivered in the second half of 2023 and 2024.