DUBAI--Saudi Arabia, the Middle East's biggest economy, is likely to be classified as an emerging market following the opening of its $590 billion stock market to foreign investors in June, according to index compiler MSCI Inc.

One of the last major markets globally to restrict foreign investments, Saudi Arabia this week issued rules that will govern international investors seeking direct exposure to some of the fastest-growing companies in the region.

Investors globally have shown strong interest in investing in the kingdom's listed entities, pushing compilers such as MSCI to include Saudi Arabia in their indices, which are tracked by funds managing billions of dollars.

"There is a lot of demand for MSCI to launch a Saudi index as soon as the market opens up to direct foreign investments," Sebastien Lieblich, the Geneva-based executive director of index research at MSCI, told The Wall Street Journal on Thursday.

And given its size, Mr. Lieblich said, Saudi Arabia will "most probably be classified as an emerging market" post review.

There were some uncertainty in the market about Saudi Arabia's classification as a frontier or emerging market once it qualifies to be elevated, given that both the benchmarks are followed by funds with different mandates.

"The Saudi equity market is also too developed, relative to other such markets, to not be included in the EM basket," Mr. Lieblich said.

But the earliest that Saudi Arabia, as per the regular process, could enter the emerging-market basket would be mid-2017, he added.

The Saudi market's planned opening on June 15 is too close to make it into our June review list, MSCI noted. Its inclusion will depend on the feedback we get from the investor community. "If there is demand, we could include it in the review list later in the year," Mr. Lieblich said.

For now, MSCI plans to launch a Saudi index around the time of the market's opening, he added.

"Investors will likely want some experience in the Saudi market before making such demands [for EM inclusion]," Mr. Lieblich said.

And based on current data, Saudi Arabia's weight in the emerging-market basket would be about 2%, MSCI said.

Saudi Arabia last year said that it would allow direct foreign investments in its listed companies to promote institutional investments in a market largely dominated by local individual investors, a move that would help reduce the high volatility there and improve the corporate-governance practices of traded companies.

The market's opening to large institutional investors will also likely bring in hundreds of millions of foreign cash, boosting the Saudi economy as it copes with the impact of low oil prices, its main source of revenue.

Write to Nikhil Lohade at Nikhil.Lohade@wsj.com

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