By the end of Q3, Berkshire was having only 15.2 million shares, which by the end of Q4 rose to 57.4 million amounting to $7.74 billion. Buffett always remains away from airlines shares as he always found the airlines business not worth investing, but in Q4 Berkshire has added stocks of four major airlines of the United States and has brought the holdings to almost seven times of what it had at the end of Q3. "Buffett clearly did not believe that scenario", Cramer said on "Squawk on the Street".

Everyone is aware of the aversion that Buffett had for technological stocks.

In addition to the increase in AAPL holdings, Berkshire Hathaway also cut its stake in Verizon significantly, down from 15 million shares to 928 shares.

Berkshire's first investment with Apple received attention in 2016 given the usual aversion by Buffett for tech companies, with the exception of IBM, which he says are outside his competence zone. It's made all the harder by the fact that changes to Berkshire's holdings aren't revealed to the public until weeks or even months after the fact in quarterly SEC filings.

Apple shares have climbed 42 percent in the last 12 months and notched a new all-time record of US$133.29 on Tuesday.

Its shares of Class A on Tuesday closed higher.

"We are increasingly confident in the outlook for Apple's iPhone 8 cycle in the second half of the year, and as a result are raising both our forecasts and our target price", Goldman Sachs analyst Simona Jankowski wrote in a research report this week. However their decisions are known to be influenced at times by Buffett. "It's quite possible that Warren woke up and began to understand the virtues of Apple that he had been neglecting or, like with Precision Castparts, Todd or Ted had an affinity for Apple that sparked interest from Warren".

Monsanto and Sirius did not immediately respond to requests for comment. The new stake makes Berkshire one of Apple's ten largest investors.