It might surprise investors that 47% of Warren Buffett's Berkshire Hathaway portfolio is in one stock. For an investment manager who preaches the virtues of diversification, this decision seems counterintuitive, to say the least, especially when one can easily assume that an artificial intelligence (AI) stock would imply higher risks.

However, it might also relieve some investors to know that the stock is Apple (NASDAQ: AAPL), the largest publicly traded company by market cap. Here's why Buffett's team seems to stick with this tech giant and why it will likely remain a Berkshire Hathaway mainstay for some time to come.

Admittedly, Buffett's team has not appeared to target AI stocks directly but rather focuses on solid companies that also happen to utilize AI. Other so-called "Buffett AI stocks," such as Amazon and Snowflake, combined comprise less than 1% of Berkshire's portfolio. Also, while Buffett belatedly embraced technology stocks long ago, Apple is his company's only tech position valued at over $10 billion.

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Source Fool.com