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DFDSX, also known as the DFA U.S. Core Equity 1 ETF, doesn't track a standard, pre-defined index. Instead, it uses a flexible, computer-driven approach that actively overweights or underweights stocks based on factors like value and profitability, aiming to outperform traditional market benchmarks. This means its composition can subtly shift, offering a more nuanced and dynamic approach to broad U.S. equity exposure.