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Core Viewpoint - Berkshire Hathaway, led by Warren Buffett, has made significant changes to its stock portfolio in the third quarter, including a new investment in Alphabet and a reduction in its holdings of Apple [3][12]. Group 1: Portfolio Changes - Berkshire Hathaway initiated a position in Alphabet, purchasing approximately 17.8 million shares valued at about $4.34 billion, representing 1.62% of its total portfolio [7][10]. - The total market value of Berkshire's stock holdings reached $267 billion, with the top ten holdings accounting for 86.69% of the total portfolio [5][6]. - In the third quarter, Berkshire sold off about 41.8 million shares of Apple, reducing its stake by 14.92%, while still holding over 238 million shares valued at approximately $60.66 billion, making Apple its largest holding [12][14]. Group 2: Increased Holdings - Berkshire increased its stake in Chubb Limited (formerly known as ACE Limited) by approximately 4.3 million shares, raising its market value by $1.21 billion, with the holding percentage increasing from 3.04% to 3.31% [9][10]. - Additional increases were noted in Sirius XM, Domino's Pizza, and Lennar Corporation, reflecting a strategic focus on these companies [9]. Group 3: Reduced Holdings - The company further reduced its holdings in Bank of America by approximately 37.2 million shares, decreasing its stake from 11.12% to 10.96% [12][14]. - Berkshire completely exited its position in D.R. Horton, selling all 1.485 million shares, which is significant given the company's role as a barometer for the U.S. housing market [14][15].