Warren Buffett and the rest of Berkshire Hathaway's (NYSE: BRK.A)(NYSE: BRK.B) investing team typically don't discuss the stocks they buy and sell, so we have to rely on the quarterly glimpses of the portfolio we get from Berkshire's SEC filings. Berkshire just posted its most recent 13-F filing, which shows a snapshot of the stocks it held as of Dec. 31, 2020. Berkshire added a few new positions, built some of its existing ones, and sold some stocks as well. Here's a complete rundown of all of the moves Berkshire made. Image source: The Motley Fool. 4 new stocks in Berkshire's portfolio Buffett and his team added a few stocks during the fourth quarter: Company (Symbol) Shares Bought Market Value Verizon (NYSE: VZ) 146,716,496 $8.62 billion Chevron (NYSE: CVX) 48,498,965 $4.10 billion Marsh & McLennan (NYSE: MMC) 4,267,825 $499 million EW Scripps (NYSE: SSP) 23,076,923 $364 million Data source: Berkshire Hathaway 13-F. Market values as of 2/17/21. We already knew about the Scripps investment, which technically took place in January, but since it's a new position to the portfolio, it's still worth noting. The Verizon and Chevron buys were the two biggest stories of the quarter by far. It's unusual for Buffett to buy such large positions right away, so it looks like the Oracle of Omaha is quite confident in these choices. However, neither decision is too surprising. Verizon, in particular, is a rock-solid income stock trading for a reasonable valuation and could have quite a bit of upside potential during the wide-scale rollout of 5G technology in the coming years. 6 stocks Berkshire bought more of In addition to the new purchases, Berkshire added to some of its existing investments. There are no surprises here. Buffett began building positions in several pharmaceutical stocks in the third quarter, as well as in T-Mobile U.S. These moves are just continuations of those purchases. Company (Symbol) Shares Bought Market Value of New Shares AbbVie (NYSE: ABBV) 4,268,766 $455 million Merck (NYSE: MRK) 6,294,333 $477 million Bristol Myers Squibb (NYSE: BMY) 3,364,822 $204 million Kroger (NYSE: KR) 8,555,578 $291 million RH (NYSE: RH) 24,200 $11 million T-Mobile U.S. (NASDAQ: TMUS) 2,824,844 $343 million Data source: Berkshire Hathaway 13-F. Market values as of 2/17/21. 6 stocks Berkshire reduced While Buffett says that his "favorite holding period is forever," Berkshire sells stocks quite regularly. In the fourth quarter, we learned that Berkshire reduced six of its stock positions. Company (Symbol) Shares Sold Market Value of Shares Sold Apple (NASDAQ: AAPL) 57,160,000 $7.44 billion U.S. Bancorp (NYSE: USB) 823,834 $40 million General Motors (NYSE: GM) 7,500,000 $397 million Wells Fargo (NYSE: WFC) 74,956,573 $2.76 billion Suncor Energy (NYSE: SU) 5,352,318 $100 million Liberty Latin America (NASDAQ: LILAK) 146,177 $1.7 million Data source: Berkshire Hathaway 13-F. Market values as of 2/17/21. The two largest reductions by far were Apple and Wells Fargo, but neither was a huge shock. Apple has been an incredibly successful investment for Berkshire, but with the stake representing over one-fifth of Berkshire's entire market cap, it was due for a trim. Wells Fargo is a stock Buffett has been reducing for some time. 5 stock positions Berkshire exited completely Berkshire has been unloading most of its bank stocks that aren't called Bank of America (NYSE: BAC) in recent quarters, and the fourth quarter was no exception. In fact, Berkshire completely sold out of five stock positions in the quarter, three of which were banks. Company (Symbol) Shares Sold Market Value of Shares Sold PNC Financial (NYSE: PNC) 1,919,827 $321 million JPMorgan Chase (NYSE: JPM) 967,267 $140 million M&T Bank (NYSE: MTB) 2,919,613 $431 million Barrick Gold (NYSE: GOLD) 12,000,000 $250 million Pfizer (NYSE: PFE) 3,912,216 $137 million Data source: Berkshire Hathaway 13-F. Market values as of 2/17/21. What it all means to you We don't know why Buffett and his team decided to buy or sell these stocks. We can speculate, but Buffett is notoriously tight-lipped when it comes to moves in Berkshire's stock portfolio. Keep in mind that this is a snapshot of Berkshire's portfolio at the end of 2020. With the exception of E.W. Scripps, which was reported in January, we have no idea what Berkshire has done in the past month and a half. Investors should take this information with a big grain of salt. It's generally not a great idea to buy or sell any stock just because a billionaire did, even if that billionaire is Warren Buffett. There's nothing wrong with using this information as a starting point for your own investment research, but it's still important to do your due diligence. 10 stocks we like better than Berkshire Hathaway When investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now... and Berkshire Hathaway (B shares) wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of November 20, 2020 Matthew Frankel, CFP owns shares of Apple, Bank of America, Berkshire Hathaway (B shares), General Motors, US Bancorp, and Wells Fargo and has the following options: short February 2021 $140 calls on Apple. The Motley Fool owns shares of and recommends Apple, Berkshire Hathaway (B shares), and Bristol Myers Squibb. The Motley Fool recommends RH, T-Mobile US, and Verizon Communications and recommends the following options: short January 2023 $200 puts on Berkshire Hathaway (B shares), short March 2021 $225 calls on Berkshire Hathaway (B shares), and long January 2023 $200 calls on Berkshire Hathaway (B shares). The Motley Fool has a disclosure policy.Source