Saudi Arabian Oil Co., the largest energy firm in the world, is considering listing up to 5% of its value on a stock exchange in New York within the next year, a top Saudi oil official said Thursday. By listing even a tiny fraction of the company, known as Saudi Aramco, the offering would create one of the world’s most valuable energy firms. Estimates of Saudi Aramco’s value have varied, but using a conservative number of $2.5 trillion , a 5% listing would give it a potential value of $125 billion—bigger than BP BP -0.38 % PLC and French oil titan Total SA TOT -0.49 % . The Saudis are considering listing Aramco at a time when the kingdom is trying to raise cash during a period of sharply lower oil prices and transition […]