Apple Is Buffett's Best Investment. It's Also Now One of His Riskiest.

The legendary investor and his longtime partner, Charlie Munger, changed their stripes for a tech stock. Now, the size of the stake is worrying some Berkshire shareholders.

The legendary investor and his longtime partner, Charlie Munger, changed their stripes for a tech stock. Now, the size of the stake is worrying some Berkshire shareholders.