The opening of the Tadawul Saudi Stock Exchange allows companies, particularly those that are not in the oil business, to raise money straight from foreign investors, with the goal of expanding businesses, diversifying the economy and creating more jobs for the kingdom's growing population.
Before Monday, foreigners only could access the market indirectly, through a local Saudi institution, which was costly and complicated.
The stock exchange's estimated value makes it the biggest in the Middle East. Petrochemical firms make up a fifth of Tadawul, with heavyweights like Saudi Basic Industries Corp among those listed.
That lower revenue could constrain government spending, which in turn would affect the many companies relying on government projects. The kingdom has been drawing from its robust foreign reserves to maintain spending.
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An influx of foreign money could "help to plug some of the external shortfall and slow the pace at which Saudi Arabia is drawing down its reserves," says the London-based analysis firm Capital Economics.
The firm says Saudi Arabia has been traditionally cautious about foreign influence in its political and economic affairs.
However, foreign investors say they are taking a cautious approach and warn not to expect an immediate rush of foreign investment into the Middle East's biggest market.
"In the immediate to short term, the money flow will be gradual," says Sachin Mohindra, Gulf portfolio manager for Invest AD.
One reason for the cautious approach: When local investors anticipated the opening of the market, they bid up stock prices, leaving them overvalued in the opinion of fund managers.