U.S. exchanges' four-character limit for ETF tickers is creating fierce competition in the $10 trillion industry, particularly for single-stock funds. With 456,976 possible combinations, options narrow drastically when built around existing company tickers. MicroStrategy-inspired ETFs, for instance, leave issuers with just 52 choices using 'MST'. Memorable tickers are crucial for differentiation and can improve stock liquidity.

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