Carlos Diez, CEO and founder of MarketGrader, joins Bilal Little on ETF Central to discuss his firm's fundamentals-driven approach to index investing and how it bridges the gap between active and passive strategies. Diez shares his journey from Colombia to founding MarketGrader in 1999, built around a 24-factor rating system that historically designates only 15% of covered companies as a buy. He highlights the Barron's 400 ETF as a core equity holding designed to reduce concentration risk through equal weighting across high-quality U.S. companies, and closes by framing AI as a broad economic enabler rather than a narrow market trade.