Saudi Stock Exchange (Tadawul) sign is seen at their headquarters in Riyadh on November 3, 2019. - Saudi Aramco announced Sunday its long-awaited stock market debut in what could be the world's biggest IPO, underpinning Crown Prince Mohammed bin Salman's ambitions to overhaul the kingdom's oil-reliant economy. (Photo by FAYEZ NURELDINE / AFP) (Photo by FAYEZ NURELDINE/AFP via Getty Images)