Warren Buffet has put on a clinic for Wall Street and the investing community. He's created more than $610 billion in value for shareholders and delivered an aggregate return of 3,641,613% for the company's Class A shares.

Wall Street and investors watch every stock the company buys and sells because of the incredible track record of theOracle of Omaha. It's easy to do because of the requirement to file Form 13F with the SEC once a quarter. In the most recent quarter, a 13F shows what the smartest and most successful investors have been buying and selling.

Warren Buffett at his company's annual shareholder meeting.

WarrenBuffett is the CEO of the company. The Motley Fool used this image.

You might not know that his company has $6.3 billion in assets under management. These holdings are not listed in a filing.

General Re was acquired by Warren Buffet's company in 1998. New England Asset Management is an operating segment of the company. New England Asset Management's $6.31 billion in assets under management are owned by Warren Buffet's company.

Even though there are more than 160 different holdings in this secret portfolio, only three of them are tied up.

Apple: 56.6% of invested assets

Apple is the biggest holding of New England Asset Management. As of this past weekend, Apple made up an even bigger percentage of NEAM's invested assets than it did before.

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According to reports, Apple has checked all the appropriate boxes for Warren Buffet. Its innovation has propelled its revenue and earnings to an all-time high, and it has an extremely loyal customer base.

Apple's physical products have introduced consumers to its brand for a long time. Apple accounted for half of the U.S. market share. According to data from Counterpoint Research, Apple has sold at least half of U.S. smartphones since 5G versions were introduced.

Apple's future is much more than just the sale of devices. Tim Cook is in charge of a multiyear transition. The company's operating margins should be improved as a result of focusing on subscriptions. The products that consumers still love are not being abandoned. As a platform provider, it is realizing its potential.

Apple's capital return program is one of the most talked about aspects of the company. Apple has bought up nearly $500 billion worth of its own common stock. Every year it returns close to $14.9 billion to shareholders as a dividend.

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U.S. Bancorp: 14.9% of invested assets

U.S. Bancorp is the parent company of the more familiar U.S. Bank.

NEAM held more than 17 million shares as of the first quarter. The NEAM has $6.3 billion of invested assets.

The fiscal prudence of U.S. Bancorp's management team is one of the reasons it is so popular with money managers. Money-center banks have had trouble with riskier derivatives in the past. The bread and butter of banking is growing its loans and deposits. U.S. Bancorp has been able to deliver higher return on assets without these riskier land mines.

The company's digital engagement trends are amazing. The majority of company transactions were done online or via the mobile app. When 2020 began, only 45% of loan sales were conducted online. Digital transactions are cheaper than in person or phone interactions. U.S.Bancorp's success in encouraging users to bank digitally is allowing it to reduce its noninterest expenses.

There has been no suggestion that anything is wrong with the nation's steadiest regional bank.

Businesspeople in office shaking hands.

The image came from the same source as the one above.

Bank of America: 14.9% of invested assets

Another stock that ranks very highly with Warren Buffet is the third biggest holding in his secret portfolio. At the end of the first quarter, NEAM held more than 22.7 million shares of Bank of America, which equates to 14.9% of its investments. By comparison, BofA has 1 billion shares, which works out to 10% of the company's investments.

Three points can be used to explain Warren Buffet's attraction to Bank of America.

The oracle of Omaha can take advantage of a simple numbers game that favors long-term investors if bank stocks are a good investment. recessions are an inevitable part of the economic cycle, that's what billionaire investor Warren Buffet knows. A recession usually lasts for a few months to a few quarters. Economic expansions tend to last for a long time. Buying well-capitalized bank stocks allows the company to take advantage of the expansion of the U.S. and global economy over time.

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BofA is the most sensitive bank to interest. With inflation hitting four-decade highs in the U.S., the central bank has had no choice but to raise interest rates. The net-interest income earning potential for financial institutions should increase as a result of these rate hikes. A shift in the interest rate yield curve would net Bank of America $5.4 billion in net-interest income over the course of a year.

BofA's digitization initiatives need to be liked by Buffet. BofA has gained 5 million digital active users over the past three years, even though U.S. Bancorp is the leader in digital banking. The percentage of loan sales done digitally has gone up from 30% to 53%. BofA is being helped by a steady digital push.