For decades legendary investor Warren Buffett refused to buy technology stocks. He missed the huge bull market in the mid to late 1990’s and people repeatedly questioned his decision in light of the obvious tech revolution. After the dot-com bubble burst he looked brilliant, for a while at least. Interestingly, Buffett avoided tech stocks not due to some core issue such as high valuation, but instead because he simply did not understand the industry. As someone who popularized the term “circle of competence,” his lack of deep understanding of the sector meant that he did not feel like he could analyze these companies well enough to make an investment.

Then in 2011 something changed. Buffett started to amass a huge stake in his first technology investment; IBM. Close followers of the Oracle of Omaha, especially those who knew a decent amount about the tech sector, were doubly shocked at hearing this news. Not only had Buffett violated his decades old rule, but he had chosen for his first tech investment a giant that was widely seen within the industry as being a symbol of “old tech” – one that was only going to be marginalized by newer companies and technologies.

Fast forward six years and Berkshire Hathaway’s 2016 annual report shows that Buffett’s firm owns a staggering 81.2 million shares of IBM (IBM). Since purchasing 63.9 million in 2011, he has increased his position by another 27% in subsequent years. That stake was worth $13.5 billion as of year-end 2016. The annual report also discloses his total cost basis in IBM; $13.8 billion. Given a cumulative loss since the initial purchase in 2011, it is hard to argue that Buffett should have ventured into an industry he admittedly knew little about.

While the IBM story is old news for Buffett watchers, I think it is noteworthy given his recent comments on CNBC two weeks ago that during the month of January he acquired 76 million shares of Apple (AAPL). Buffett admitted in the interview that he did not have an iPhone and that he queried his young family members to see how they like Apple products.