Billionaire Warren Buffett has a long history of his Berkshire Hathaway Inc BRKBRK conglomerate outperforming the S&P 500, which is tracked by the SPDR S&P 500 ETF Trust SPY.While many stocks are down in 2025, one of Buffett's top holdings is significantly outperforming the broader market and could help him outperform in 2025 once again.What Happened: Buffett's investment in Apple Inc AAPL, which remains his largest stock position in Berkshire Hathaway, has helped produce strong returns but is turning into ...