Buffett's company bought another 20.8 million Apple shares worth $3.2 billion, raising its stake to 5.8%, according to the filing. Shares in Apple have surged nearly 18% this year. Berkshire shrunk its stake in BNY Mellon by roughly 60%, to 25.1 million shares. At current prices, the divestment is worth nearly $2 billion. The number of shares Berkshire holds fell 12.3%, to 52.7 million.

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