OMAHA, Nebraska — The investment firm led by Warren Buffett has sold about 13% of its stake in Apple during the January-March quarter, according to Berkshire Hathaway’s first-quarter earnings report released Saturday.

Apple accounts for about 40% of Berkshire’s equity portfolio. The unloading of Apple shares for the second quarter in a row may be a sign that Buffett has changed his views regarding the U.S. tech giant, which he has spoken highly of.

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