The Oracle of Omaha's secret portfolio contains 120 securities -- one of which is a historically cheap AI stock.

Warren Buffett is one of the richest men on earth and the business mogul and investment tsar who is fondly known as the Oracle Of Omaha. Recently, the 94-year-old (soon to be 95) announced his successor in the form of his middle son, Howard Graham Buffett or simply Howie Buffett.

Considering how much Buffett has outperformed the broader market, it's not uncommon for investors to mirror his trades. This can be done by tracking Berkshire's quarterly filed Form 13F, which provides a snapshot of which stocks Buffett and his team have been buying and selling.

Berkshire Hathaway CEO Warren Buffett was born in Omaha, Nebraska, in 1930 and is one of history's most successful investors. Trained under the tutelage of Benjamin Graham, the father of value investing,