Nike shares tumbled 20% in their worst day on record, dragging down the Dow and S&P 500, which fell 0.1% and 0.4%, respectively. The Nasdaq lost 0.7%.

Nike shares tumbled 20% in their worst day on record, dragging down the Dow and S&P 500, which fell 0.1% and 0.4%, respectively. The Nasdaq lost 0.7%.