As reported by Reuters, three major aluminium producers, South32 Ltd, Rio Tinto Ltd and UC Rusal have offered aluminium premium of $135 per tonne to Japanese buyers for shipments in the April to June quarter. According to sources from the pricing sector, this records a 42% increase from previous quarter. This offer would mark the second quarterly increase continuously. The increase is driven by rise in premiums in the United States and Europe and falling inventories Japan due to solid local demand.