Here's how Warren Buffett's company changed its holdings at the end of 2021

Warren Buffett is arguably the world's most famous investor and his investment moves are closely followed.

Each quarter, the company he runs, Berkshire Hathaway, discloses its current holdings to shareholders. This weekend, the Omaha-based company announced its fourth-quarter results and Buffett released his annual letter to shareholders.

Here are some of the changes Buffett and his two investment officers, Todd Combs and Ted Weschler, made during the fourth quarter, according to a regulatory filing with the Securities and Exchange Commission.

These changes were made prior to a stock-market pullback that occurred during January 2022, when the S&P 500 fell 5.3% and the tech-heavy Nasdaq Composite declined 9%. All holdings data is as of Dec. 31, 2021.

Berkshire Hathaway's portfolio additions:

Nu Holdings (NU)

A new $1 billion position was established in Nu Holdings during the fourth quarter. Nu Holdings is a digital financial services platform that offers credit, debit cards, savings solutions and other personal finance services. It primarily operates in Brazil, Mexico and Colombia.

Berkshire also established a new position in video-game maker Activision Blizzard. It's likely Berkshire has already made a nice profit on the $975 million stake, after Activision agreed to be acquired by Microsoft in a $75 billion deal. The stock ended 2021 at about $66 per share and recently traded for $81.50.

Liberty Sirius XM Series A (LSXMA) and Liberty Media Formula One (FWONK)

Berkshire also boosted its stake in Liberty Sirius XM Series A by about 36 percent, to just over $1 billion, and established a new position in Liberty Media Formula One Series C, with about $134 million. Both are tracking stocks tied to John Malone's Liberty Media empire. The interests include stakes in SiriusXM, Live Nation Entertainment and Formula One.

Chevron (CVX)

Berkshire increased its position in oil company Chevron by about one-third during the fourth quarter. The stake, which was first purchased in the third quarter of 2020 and halved during the first quarter of 2021, was worth about $4.5 billion at the end of the quarter.

Marsh & McLennan (MMC)

Berkshire cut its stake in insurance broker Marsh & McLennan for the third consecutive quarter, reducing it by about 85 percent during the most recent quarter. The position was first established in the third quarter of 2020, but Berkshire has sold much of the position as the price of shares increased.

AbbVie (ABBV), Bristol Myers Squibb (BMY), Teva Pharmaceuticals (TEVA) and Royalty Pharma (RPRX)

Berkshire also continued to reduce its stake in drugmakers AbbVie and Bristol Myers Squibb. Both positions were cut by more than 75 percent during the quarter. A more than $400 million position in Teva Pharmaceuticals was completely eliminated during the quarter. It also slashed its Royalty Pharma stake by more than one-third after establishing the position just one quarter earlier.

Visa (V) and Mastercard (MA)

Charter Communications (CHTR)

A stake in broadband and cable company Charter Communications was reduced by about 9 percent during the fourth quarter. It was still worth about $2.5 billion at quarter end and has performed well for Berkshire since the position was first bought during the second quarter of 2014. The stock traded for about $140 per share in May of 2014 and traded above $800 during the third quarter of 2021. It currently trades for about $608 per share.

Top stock holdings in Buffett's portfolio

Berkshire's top holdings didn't change during the fourth quarter and just four companies accounted for more than 70% of the portfolio's value.

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