Warren Buffett is one of the greatest investors of our time. Berkshire Hathaway (NYSE: BRK.B), the conglomerate he has headed for decades, has trounced the broader market since he took it over in 1965.

A big part of Berkshire's financial success has also been driven by its large equities portfolio, which is now valued at more than $317 billion. For decades leading up to the 21st century, Buffett and Berkshire invested heavily in the banking, insurance, energy, media, and consumer staples sectors.

But more recently, Buffett and other members of Berkshire's investing team have also waded into the fast-growing tech sector, and three big tech stocks now account for roughly 39% of Berkshire's portfolio. Of course, one of these stocks holds the lion's share of Buffett's tech investments.

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Source Fool.com