Warren Buffett's Berkshire Hathaway reduced its stake in Apple by 55% during the first half of 2024.Berkshire Hathaway's trimming of Apple holdings potentially cost the company a $23 billion profit opportunity.If Berkshire had maintained its previous position, its Apple stake would be valued at approximately $210 billion.Berkshire Hathaway's moves resulted in $23 billion in missed profits, according to calculations by Business Insider.