Mid-size geared bulkers ~50,000-65,000 DWT; Ultramax is the slightly-larger evolution at ~63,000-65,000 DWT.
Regulatory detail & full definition
Most numerous bulker class. Self-geared (4× 30 t cranes typical). Carries grain, coal, alumina, project cargo, steel. Baltic Supramax Index (BSI) routes are the spot benchmarks. Ultramax has longer holds and heavier deadweight on the same beam.