Apple Inc's (AAPL - Get Report) blowout quarter has benefited the tech giant's many institutional investors, not least of which has been Warren Buffett's Berkshire Hathaway (BRK.B - Get Report) .

The legendary investor, who famously eschewed investing in technology stocks for decades because he said he didn't understand their businesses, has gotten religion on Apple, first amassing a position in mid-2016 and adding to it since then. As of the end of June this year, Berkshire owned 130.2 million shares of Apple, according to quarterly documents filed with the SEC. Those shares equate to roughly a 2.5% stake in Apple, whose current market cap stands at $890 billion. 

Assuming that Buffett hasn't reduced or added to his position since then, that means Berkshire has earned a paper profit of $586 million on its Apple shares on Friday morning alone from the stock's $4.50 rise following its impressive fiscal fourth quarter earnings report. Berkshire's total stake is now worth about $22.5 billion.

Based on some rough calculations, Buffett has made about $7.4 billion from his Apple stake this year alone.

The Oracle of Omaha told CNBC earlier this year that he thinks Apple will be the first company to reach a $1 trillion valuation. 

If he's right, then Buffett will likely own at least $25 billion of that huge figure.

Warren Buffett isn't your average billionaire:

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