DUBAI--Borse Dubai Thursday said it has sold its entire stake of nearly 17.4% in the London Stock Exchange Group, a day after launching the share sale that ends an almost decade-old relationship.

In a brief statement, Borse Dubai said it has sold its entire remaining share holding in the LSE Group through a block sale managed by BofA Merrill Lynch, Barclays Bank and Nomura International.

It didn't say who bought the stake or how much it was paid for it, but the deal was potentially worth about $2.2 billion based on Wednesday's closing price for LSE shares.

Borse Dubai, a holding company owned by the emirate's wealth fund, had purchased a 28% LSE stake for 14.14 pounds ($21) per share in 2007 as part of a complex, wider deal with U.S. bourse operator Nasdaq.

It wasn't immediately clear why Borse Dubai sold its remaining LSE shares, after starting to reduce its stake in the past year. Borse Dubai officials weren't immediately available for comment.

The company's portfolio of assets includes stakes in Dubai's two stock exchanges and a 17% stake in Nasdaq, according to its website.

LSE, one of the world's largest exchange operators, loses one of its main shareholders of the past decade. It declined to comment Wednesday on Borse

Dubai's plan to sell its LSE stake.

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

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