MOSCOW--Russian tycoon Mikhail Prokhorov on Friday sold his entire 37.8% stake in the country's largest gold miner, Polyus Gold International Ltd. (PGIL.LN) to two billionaire bidders for a combined $3.62 billion after the deal was approved by the U.K.'s takeover panel.

Mr. Prokhorov's exit from Polyus signals a significant shift for one of Russia's wealthiest men and the 68th richest in the world, who has vowed to focus more of his energy on political aspirations and less on his business ventures. Polyus represented the largest piece in Mr. Prokhorov's empire, which includes a substantial stake in United Co. Rusal PLC (0486.HK), banking, energy and media holdings and the Brooklyn Nets basketball team in the U.S.

In a statement, Mr. Prokhorov's holding company Onexim Group said while it was proud of having played a part in creating Polyus and turning it into a world leader, it was time to get out.

"In light of...the offer that was received and our view of the balance between the company's achievements and its potential, we made the decision that the time had come for Onexim Group to sell and realize its profit," said Onexim Chief Executive Dmitry Razumov.

Onexim says it sold an 18.5% stake to Lizarazu Ltd., a company associated with real-estate baron Zelimkhan Mutsoyev, for $1.77 billion. It also sold 19.28% of the company to Receza Ltd., a firm associated with Gavril Yushvaev, for $1.85 billion. Mr. Yushvaev was the former co-owner of Russian juice maker Wimm-Bill-Dann, which was sold to PepsiCo Inc. (PEP) in 2010 in the largest ever foreign acquisition of a Russian company. He is worth an estimated $1.2 billion, according to Forbes.

In September, Onexim had said it was in talks with two potential buyers for Mr. Prokhorov's stake in the company--which has the world's third-largest gold reserves.

The proposed deal ended up before the U.K.'s takeover panel to determine whether the proposed buyers were acting independently or in concert as a single owner. Had the panel determined that the two were acting together, giving them control of more than 30% of Polyus, it would have forced a mandatory offer to buy out minority stakeholders.

When Onexim first revealed the talks, it laid out a possible deal that involved the sale of less than 20% of the company to each of the two then-undisclosed parties. Speculation immediately focused on the role of Mr. Prokhorov's co-owner in Polyus, Suleiman Kerimov, who owns 40.2% of the company's stock through his holding company Nafta Moskva.

A person familiar with the negotiations told The Wall Street Journal that talks had involved Mr. Kerimov personally, and a consortium of business partners who would each buy small stakes in Polyus, thereby avoiding one shareholder passing the 30% ownership threshold. Mr. Mutsoyev, who is worth $1.5 billion according to Forbes, is a partner with Mr. Kerimov in potash giant Uralkali (URKA.RS).

Nafta Moskva has from the start denied any involvement in the deal.

Analysts said Mr. Prokhorov's departure would pave the way for a clearer management strategy and likely higher dividends.

"In the past there were two key shareholders who had differing views on strategy. Now the strategy will be driven by Mr, Kerimov alone, so Polyus can start paying higher dividends," said UBS metals and mining analyst Alexei Morozov.

Polyus shares were trading higher Friday.

Since the deal talks became publicly known, many analysts have said a sale could also lead to a possible merger with gold and silver producer Polymetal International PLC (POLY.LN), which was once owned by Mr. Kerimov and remains partly held by businessmen close to him. But Barry Ehrlich, of Alfa Bank, said such a merger seems unlikely in the short term, given the probable structure of the deal to buy Mr. Prokhorov's Polyus stake.

"The transaction was likely to be heavily leveraged so the new shareholders' priority now is to boost cash flow and dividends to reduce that leverage," he said. "That would make a merger deal only possible as a share-for-share transaction which would probably be unattractive to Polyus shareholders."

Write to Lukas I. Alpert at lukas.alpert@dowjones.com

Subscribe to WSJ: http://online.wsj.com?mod=djnwires

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