Some 5 million Saudis, or one-quarter of the country's citizens, drop $13b to buy the 1.5% of the kingdom's crown jewel put up for sale on Wednesday

Sale of stake in kingdom's national oil company makes it the most valuable firm in the world, but comes up short of $2 trillion valuation hoped for by crown prince

Kingdom hopes to raise billions with offer of sliver of Aramco, as it seeks to reassure investors over its valuation and potential hazards of future attacks, geopolitical risk