eNCA interview: The S&P500 is increasingly a story of just a handful of stocksIn 2025 so far, just five US companies, only 1% of the S&P500, have driven nearly two-thirds of the index’s gains. This growing concentration highlights both the strength and fragility of markets dominated by mega-cap stocks. Watch Sean Ashton, Head of Investments at Private Clients by Old Mutual Wealth, on eNCA as he unpacks this trend and what it could mean for investors.