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Genuine Parts shares lead the S&P 500’s decliners, as a big profit miss distracts investors from plans to separate into two businesses

Shares of Genuine Parts tanked on Tuesday after the auto-parts seller missed quarterly profit expectations by a wide margin and provided a disappointing 2026 outlook, due in part to weakness in its domestic NAPA business.

The stock’s GPC selloff also comes in the face of another company announcement, which investors would have normally cheered. The company said that after an extensive review, it has decided to separate into two publicly traded companies. One company would be for automotive parts, which includes its NAPA business, and the other would be for industrial parts, which includes the Motion brand.