The Global X S&P 500 U.S. Market Leaders Top 50 ETF (FLAG) invests in top 50 U.S.-listed and domiciled companies within the S&P 500 that generate at least 50% of their revenue in the U.S, excluding the real estate sector. Companies are ranked based on the S&P Market Leader Score, a quality screen developed by S&P which measures sustained free cash flow margin, sustained return on invested capital, and market share. The index uses a modified market-cap weighting to balance exposure and prevent over-concentration in the largest companies, providing a selective approach to U.S. market leadership.