Bono's Facebook stake outearned his music: Report

Bono speaks at Amnesty International Tapestry Honoring John Lennon Unveiling at Ellis Island on July 29, 2015 in New York City.
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Bono is known as for his philanthropy, stylish sunglasses and fronting iconic Irish rock band U2. But perhaps the co-founder of private equity firm Elevation Partners should be known better for his financial savvy.

Elevation Partners' 2.3 percent stake in Facebook, which it bought in 2009, has grossed Bono more than his whole music career, according to a report on U.K. news website the Mirror, citing The Sun newspaper.

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The Mirror, which is the online edition of The Daily Mirror, a British newspaper, said that share is worth about $1.4 billion, making Bono the world's richest pop star. Still, other publications pointed out Bono's hefty portfolio, which also includes Yelp, doesn't exactly qualify him as a billionaire, since he must split his stake among the Elevation Partners team.

Elevation Partners did not immediately respond to CNBC's request for comment or independently confirm the Mirror's report.

This isn't the first time Bono's Facebook shares shone the spotlight on his wealth.

In 2012, when the social network filed for an initial public offering, the shares were worth an estimated $1.5 billion. But Bono told NBC at that time that the profit doesn't go directly into his pocket, since it is invested in endowments and pension funds.

Bono, who uses much of his personal wealth for social causes, has long been vocal about the connection between enterprise and poverty, saying in 2013 that "Entrepreneurial capitalism takes more people out of poverty than aid."

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For more check out the Mirror's report here.