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Market Concentration Risk Sparks Caution Among Major Trading Firms

Scott Rubner of Citadel Securities warned that powerful fund flows driving U.S. stocks to record highs in recent weeks could face a reversal. The concentration of capital into a narrowing set of securities concerns trading executives at major firms. Market participants are monitoring flow patterns closely as investors reassess positioning. Rubner's assessment reflects growing unease among institutional traders about the sustainability of recent market performance.