Though the Oracle of Omaha has been a net seller of stocks for two years, you can be a confident buyer of these three industry-leading businesses in the new year.

It’s been a rocky week in the stock market. Warren Buffett’s Berkshire Hathaway has been buying. The Omaha, Neb., company boosted its positions in Occidental Petroleum, VeriSign and SiriusXM with stock purchases this Tuesday through Thursday,

The Berkshire Hathaway CEO spent more than $400 million on Occidental Petroleum shares, which just hit a nearly three-year low amid fears that oil prices may keep falling.

Despite Buffett overseeing stakes in nearly four-dozen securities, the lion's share of Berkshire's invested assets have been put to work in seven top ideas.

After spending much of Q3 selling shares of various companies including BAC, Warren Buffet is back to taking major long positions.