Berkshire Hathaway (BRK-B)

The upstream energy giant faces some unpredictable challenges.

This high-yield investment could continue to make up a significant portion of Berkshire's portfolio.

Kroger is a best-of-breed supermarket operator that has margin expansion during high inflation and a revenue jump during recessions as consumer eat more at home

Concentration levels in the S&P 500 are at their highest levels since 1932.

Warren Buffett signed copies of a new book about Berkshire Hathaway. Here are the details and how to have a chance to get the investor's autograph.

If the price is right, two dominant businesses -- one of which is already a sizable holding for Berkshire Hathaway -- would make for perfect acquisitions by the Oracle of Omaha.

This company leads the way in a large, fragmented market, where it can replicate a formula that has made shareholders very wealthy.