Here are Warren Buffett's biggest investments

Dennis Van Tine/AP

Warren Buffet at the premiere of 'The Post' in Washington DC.

Warren Buffett's Berkshire Hathaway has replaced Wells Fargo as its biggest investment.

Apple held the top spot in the firm's portfolio as of December 31, according to the fourth-quarter 13-F filing published last week. Major investment firms, including hedge funds, are required to disclose their long positions in stocks every quarter. Because of a time delay, however, these positions may have changed or been closed by the time the filing is public.

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Buffett's annual letter to shareholders is set to be released on Saturday.

The top-10 list below, via Bloomberg, is ranked in ascending order of the market value of Berkshire's positions at the end of the fourth quarter, and includes the gains made in that period. It also shows whether Berkshire bought more shares, sold, or did nothing. The list excludes Kraft Heinz, as this investment is accounted for with the equity method because Berkshire owns a significant controlling stake.