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.

Warren Buffett's Berkshire Hathaway acquired a $1.24 billion stake in alcoholic beverage producer Constellation Brands. Check out the analysis of STZ stock here.

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.