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State Street quietly sells two ETFs tracking the exact same mid-cap index at wildly different prices, and most investors holding the older one have no idea how much that gap costs them over time.

Designed to provide broad exposure to the Mid Cap Blend segment of the US equity market, the State Street SPDR Portfolio S&P 400 Mid Cap ETF (SPMD) is a passively managed exchange traded fund launched on November 8, 2005.

The State Street SPDR Portfolio S&P 400 Mid Cap ETF offers broad, diversified exposure to U.S. mid-cap stocks with a 0.03% expense ratio. SPMD is overweight in industrials and information technology, sectors poised to benefit from AI-driven capex cycles and a higher-for-longer inflation environment. The ETF trades at a 25% valuation discount to the S&P 500, reflecting lagging earnings but potential for recovery if…