When the CEO of Berkshire Hathaway, Warren Buffett, speaks, investors of all kinds pay attention. Known as the “Oracle of Omaha,” Buffett has consistently outperformed the S&P 500 for nearly six decades.

While the S&P 500 has seen significant growth over the years, Buffett has managed to achieve an astounding return of almost 5,000,000% in his company’s Class A shares (BRK.A). This exceptional performance attracts thousands of investors to Omaha, Nebraska, each year to learn from Buffett’s insights on stocks and the U.S. economy.

Investors eagerly await Berkshire Hathaway’s quarterly Form 13F filings, which provide valuable information about the latest moves of successful money managers on Wall Street.

Although 13F filings offer insights, they do not reveal the complete picture of Warren Buffett’s preferred stock choices.

Buffett’s Strategic Investments

Before Berkshire Hathaway files its 13F on May 15, based on previous reports, 13Fs, and annual shareholder letters, it is evident that Warren Buffett and his team have devoted substantial resources to building their core portfolio.

During Berkshire’s annual shareholder meeting, Buffett disclosed that he, along with top aides Todd Combs and Ted Weschler, sold 13% of their significant holding in Apple for tax purposes. This decision reduced Berkshire’s stake in Apple to an estimated $144.5 billion by the end of March.

Despite this sale, Buffett and his team have realized an enormous gain on their investment in Apple. Data from WhaleWisdom.com indicates that Berkshire Hathaway’s cost basis in Apple is below $40 per share, implying an initial investment of approximately $31.3 billion.

The Billion-Dollar Investments

In addition to Apple, Berkshire Hathaway has allocated substantial sums to build positions in the energy sector, particularly in Chevron and Occidental Petroleum. Approximately $16 billion and $13 billion have been invested in Chevron and Occidental, respectively, excluding Berkshire’s $8.5 billion stake in preferred Occidental Petroleum stock.