LONDON—OPEC pumped more oil last month driven by higher output from Saudi Arabia, the cartel’s de facto leader, which has for more than a year led a coalition of big producers in curbing production.
Total oil production in the Organization of the Petroleum Exporting Countries increased by 35,000 barrels a day in May, month-on-month, to average 31.87 million barrels a day, the cartel said Tuesday in its closely watched monthly report. Output in Saudi Arabia jumped by 85,500 barrels a day but was partly offset by production...