Billionaire Warren Buffett’s company increased its already significant Apple investment at the end of last year, while reducing a fresh investment in computer chip producer Taiwan Semiconductor and two long-standing bank holdings.

In records filed with the Securities and Exchange Commission on Tuesday, Berkshire Hathaway Inc. disclosed major modifications to its stock portfolio. Because of Buffett’s incredibly successful investing record over the decades, many investors keenly monitor the company’s activities.

Berkshire increased its stake in Apple by about 21 million shares in the final three months of last year, giving it 915.6 million shares by the end of 2022.

Despite the fact that Apple is merely a stock investment, Buffett has named it one of the four “giants” that drive Berkshire’s success.

Berkshire Hathaway’s other significant drivers include firms it owns outright, such as its insurance unit, which includes Geico, its energy division, which owns several large utilities, and BNSF railroad.

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During the period, Berkshire reduced its holdings in Taiwan Semiconductor, US Bancorp, and Bank of New York Mellon.

Berkshire reduced its Taiwan Semiconductor investment to 8.3 million shares just three months after declaring a 60 million-share holding in the chipmaker.

The company also reduced its holding in US Bancorp from 52.5 million shares to 6.7 million by the end of the year.

Also, Buffett reduced their interest in Bank of New York Mellon again during the quarter, selling more than 37 million shares to leaving it with just over 25 million shares of the bank.

The quarterly reports Berkshire published Tuesday do not specify which investments Buffett is responsible for and which were made by the company’s two other investment managers, but Buffett typically handles all of Berkshire’s $1 billion or more assets.

Buffett does not remark on these stock filings on a regular basis.

Berkshire also increased one of its smaller investments, which it originally disclosed three months ago, by purchasing more than 1.2 million Louisiana Pacific shares, giving it a nearly 10% stake in the building supplies manufacturer.

Buffett continues to reduce Berkshire’s holding in Activision Blizzard to 52.7 million shares throughout the quarter.

He has stated that he purchased the stock as a wager that Microsoft’s acquisition of the video game producer would go through.

Buffett’s Omaha, Nebraska-based conglomerate also reduced its stakes in Kroger and Ally Financial.

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Occidental Petroleum, Buffett’s largest investment over the last year, stayed unchanged during the quarter.

At the conclusion of the year, Berkshire had 194.4 million Occidental shares and warrants to purchase an additional 83.9 million shares.

During the quarter, Berkshire acquired approximately 2 million more Chevron shares, giving it 8.7% ownership of the oil giant.

One of the most significant developments in Berkshire’s portfolio isn’t represented in SEC filings because the company’s investment in Chinese electric carmaker BYD is traded on the Hong Kong stock exchange.

Berkshire has sold 95 million of the 225 million BYD shares it purchased in 2008.

Berkshire owns a diverse range of manufacturing, retail, and service companies in addition to stocks.

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