No price has been revealed for this latest series of newbuilds. Brokers suggest each ship is costing around $33m.
Over the last 12 years, Ciner has ordered a total of 15 ultramaxes at New Dayang, a yard owned by state-run machinery manufacturer Sumec Group.
Sumec, which took over Dayang Shipbuilding in 2018, now has a backlog of 67 ships with production set to the fourth quarter of 2027.
Istanbul-based Ciner is involved in dry bulk and tankers with its current fleet numbering 24 ships totalling around 2m dwt.