On May 21, [LME cash-3M copper] backwardation was $14.01/mt, with open interest decreasing by 4,845 lots to 285,331 lots. On May 21, [LME cash-3M aluminum] contango was $6.13/mt, with open interest decreasing by 8,256 lots to 688,439 lots. On May 21, [LME cash-3M lead] contango was $26.12/mt, with open interest decreasing by 5,820 lots to 138,401 lots. On May 21, [LME cash-3M zinc] contango was $28.9/mt, with open interest decreasing by 4,611 lots to 212,980 lots. On May 21, [LME cash-3M tin] contango was $107/mt, with open interest decreasing by 105 lots to 21,513 lots. On May 21, [LME cash-3M nickel] contango was $201.15/mt, with open interest decreasing by 3,635 lots to 236,304 lots.