Berkshire Hathaway revealed on Friday that it has taken a $4.3 billion stake in Alphabet, the parent company of Google, while continuing to reduce its holdings in Apple. The disclosure comes as Warren Buffett prepares to step down after more than six decades at the helm of the conglomerate.

In a filing with the U.S. Securities and Exchange Commission, Berkshire reported owning 17.85 million shares of Alphabet as of September 30. The investment marks a notable addition to the company’s portfolio, highlighting Buffett’s continued interest in major tech firms even in the final months of his tenure.

At the same time, Berkshire has trimmed its stake in Apple to 238.2 million shares from 280 million in the third quarter. This reduction represents nearly three-quarters of the 905 million Apple shares the company once held, underscoring a strategic shift in its tech investments.

The filing detailed Berkshire’s U.S.-listed stock holdings as of September 30, which make up the majority of the conglomerate’s $283.2 billion equity portfolio.

Market observers are watching closely as Berkshire adjusts its positions in some of the world’s largest technology companies, interpreting the moves as an indication of the investment strategy that may guide the firm after Buffett’s departure.