Berkshire added to its position in Occidental Petroleum in the fourth quarter, boosting its stake to 28.8%. Occidental Petroleum is an exploration and production (E&P) company, with concentrated acreage in the Permian Basin of west Texas and eastern New Mexico. The company also has a chemical business and a growing carbon-capture arm.

Constellation Brands and Diageo are major players, but Warren Buffett chose STZ over DEO. See why STZ stock could be a more attractive investment than DEO stock.

Buffett may be the world's most well-known value investor -- an investor who buys a stock when it's trading below its intrinsic value, with the idea that the rest of the market will eventually recognize the company's strengths and hop on board. And that will push the stock higher, delivering gains to those who got it for a good price.

Constellation Brands shares jumped in premarket trading Tuesday after Warren Buffett's Berkshire Hathaway disclosed a new investment in the beer and spirits maker. Monitor these key chart levels.

Warren Buffett is famous for backing strong consumer stocks like Coca-Cola (NYSE KO), but his latest investment indicates he may be on the verge of becoming a beer baron. Public filings show Buffett’s Berkshire Hathaway (NYSE BRK.

Citi's lead beverages analyst Filippo Falorni views Berkshire Hathaway's investment as "a perfect example of value investing."

Warren Buffett bought a beer stock in the fourth quarter, which could be unique since he doesn't drink. The move also comes as the stock faces pressure from President Donald Trump.