On Tuesday, Warren Buffett’s Berkshire Hathaway Inc. (BRK.A.) confirmed some moves we learned about earlier this month and revealed others.

According to the company’s 13-F filing, published on Tuesday, the Oracle of Omaha’s investment vehicle increased its holdings in the likes Apple Inc. (AAPL), Monsanto Co. (MON) and Teva Pharmaceuticals (TEVA) in the period running from Jan. 1 to March 31.

Berkshire added almost 75 million Apple shares during the quarter, bringing its total stake in the iPhone maker to just over 239.5 million shares to become the Cupertino, California-based company’s second-largest shareholder.

Berkshire also doubled its position in Teva to 40 million shares, having first bought 18.8 million of the generic drugmaker’s shares in the fourth quarter of last year, and snapped up an extra 7.26 million shares in Monsanto, the agricultural product giant that now looks set to be acquired by German conglomerate Bayer AG for $62 billion. According to the filing, Berkshire also boosted its stake in Delta Air Lines Inc. (DAL), Bank of New York Mellon Corp. (BK) and Bancorp Inc. (TBBK).

To fund these extra positions, Buffett’s company trimmed its exposure to several other firms, including its second largest equity holding: Wells Fargo & Co. (WFC). Berkshire sold 1.7 million shares in the bank during the period, bringing the number of shares it currently holds in the company down to 456.5 million.

Berkshire also sold shares in Charter Communications Inc. (CHTR), Liberty Global PLC (LBTYB),  Phillips 66 (PSX), Verisk Analytics Inc. (VRSK) and United Continental Holdings Inc. (UAL) and completely exited its positions in the former publisher of the Washington Post Graham Holdings Co. (GHC) and International Business Machines Corp. (IBM).

Buffett’s decision to dump his remaining 2.05 million shares in IBM brings an end to a six-year old investment that he has since admitted was a mistake. Meanwhile, Berkshire’s move to sell its last 107,775 Graham shares ended an investment that once exceeded $1 billion. (See also: Warren Buffett's 10 Big Stock Losers.)

According to Reuters, Berkshire’s larger investments are made by Buffett, while smaller positions are decided on by his trusted investment managers Todd Combs and Ted Weschler. The 13-F filing does not reveal who bought and sold which stocks. (See also: 6 Stocks Warren Buffett Might Buy Next.)