Berkshire shareholders have often questioned whether 3G’s management style is in step with Berkshire’s. Mr. Buffett has fostered a reputation for allowing the businesses that Berkshire purchases to operate with little interference and hasn’t pushed for big job cuts. 3G is known for its ruthless cost-cutting.

But when asked if Berkshire might still consider doing deals with 3G, Mr. Buffett said, “It is not at all inconceivable that we could be partners in some transaction in the future.”

Mr. Buffett has defended 3G and Berkshire’s involvement with the firm. He has also pointed out that, like Berkshire, 3G doesn’t just look to buy and build businesses but also looks to hold them. He has argued that 3G and Berkshire don’t have contradictory views on cost-cutting, they only differ on the type of deals they pursue. 3G, Mr. Buffett has written, has acquired businesses that “offer an opportunity for eliminating many unnecessary costs.” Berkshire has typically avoided buying bloated companies.

He added Saturday that 3G is more comfortable than Berkshire in using debt to acquire companies and is willing to pay higher prices, but he added that 3G in certain cases may be a better operator.

It should be noted that 3G’s strategy of buying companies in need of a turnaround has also provided Berkshire with a new category of megadeals at a time when Berkshire has struggled to make large acquisitions.

Tech stocks, finally

Mr. Buffett, perhaps the most famous value investor, had famously avoided investing in tech companies for years because he didn’t understand them. But that stance seems to have evolved in recent years. Mr. Buffett told CNBC Friday that Berkshire had made its first investment in Amazon.

Berkshire has also become one of Apple’s biggest shareholders with a roughly $40 billion stake.

Todd Combs and Ted Weschler, the two investment managers whom Berkshire had hired in the past decade, are behind the push into tech stocks. Mr. Buffett credited the pair for Berkshire’s Amazon and Apple investments, but hasn’t said which one.