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Dollar Tree (DLTR) shares are on the rise in Monday's after-hours trading after the discount retailer announced Rick Dreiling would be stepping down as CEO due to health issues with Michael Creedon Jr., the company's COO, serving as interim CEO.

Meanwhile, Wynn Resorts (WYNN) shares are under pressure after the company's quarterly results fell short of Wall Street's expectations on weakness in its Las Vegas casinos business.

Cleveland-Cliffs (CLF) stock falls after the mining company reported an earnings miss in part due to its exposure to the auto industry.

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This post was written by Naomi Buchanan.